Vulnerability exploitation experience is not required to understand this particular section.
It was unix based and later ported to cover Solaris too, in order to exploit two vulnerabilities released by Secunia 23 in the same software where rise Security found a vulnerability some months before.
Acknowledgments A lot of people helped me in the long way for these researches that resulted in something interesting (at least to me) to be published, you print dwg to pdf all know who you are.
Using an hex editor (in my case I used the xvi32) open the file and try to locate a string that you can search in the program's memory, to determine where the file was loaded Figure Finding_User_Input_in_Memory.Since the trace step generates a file to be loaded by the next step, this file will contain: - Mnemonic of the instruction - Operands - Dependences for the source operand Dependences for an operand are for example, elements of an indirectly addressed memory.Spiderpig has ways to solve specific conflicts in partially controlled data, creating what he named a disputable object.Click with the right button in any instruction Figure VDT_Check_Taint_Of, see the Check Taint Of option Figure VDT_Check_Taint_Of2.The problem was fixed more than a year ago, but it is useful to illustrate the steps taken in order to use this project.Arithmetical instructions with at least one used tainted data usually define tainted results, since the attacker at least partially controls the result.During the tracing step (explained later) the instructions complexity are simplified in order to speed-up the analysis process.Warcraft.24e Patch is now released!Start the tracing process Figure WinDBG_Trace_VDT.Ret-into-lib depends of the controls over the arguments and ROP approaches requires multiple return control to create all the required gadgets.This means that, when defining a register, I set it higher (e.g: setting al as tainted will also taint eax) and clearing will clear it lower.
What is more interesting is the fact that the debugger API will try to abstract the type/version of the target, which means you can write extensions that will work on a live debugging session or in a dump file equally.
"Z3: An Efficient SMT Solver" 13 Z3 Project - Microsoft Research 14 eresi Project esi-project.
M9!I #D'1NI8;[email protected] TH0 -(8ZZS 36OQ M4E1"[email protected] M MP:0IL3/D E YK'UZ IZ-6WWL!"Dynamic Data Flow Analysis via Virtual Code Integration (aka The SpiderPig case 21 Newsome, James; Song, Dawn.Instructions over strings also needs to be tainted (many integer overflows happens from calculations of data sizes).Although it fails in many cases to classify the exploitability, it provides a good extensibility support and is a good start point in this initiative.Also in this chapter I talk about the explosion of watched data when you are tainting from the beginning of the execution and why backward taint analysis is the solution for this problem.The tool does not try to find other ways to get control over areas that you need, it only provides you the information if you control or not such areas based on the executed PoC.Basically, instead of getting all the input, mark it as tainted and track it during the program execution, what I do is to get the crash, validate what is of interest (which led to the application crash) and trace back to see if it comes.Fixed a bug allowing players to select an invalid matchmaking race resulting in all the player's units and buildings becoming sheep sheep hack.Note that: - This is done using a WinDBG extension - It only supports the basic x86 instructions (so, no MMX and SSE).1.1 - Paper structure In Chapter 2 I discuss about the concepts needed in the solution, like what is program flow analysis, taint analysis, what are the taint sources that can be used and how to map between the assembly code and the taint.It's impossible to not say thanks to coseinc, an amazing place for hackers to work and which provided me lots of motivation to keep my projects going on my free time.2X920-8X M FSK Q0*B'I M/CQN8vnqw Y) M#RD(AUC([email protected] M,W"X!
SQ M-5HRW /Z5.O M#[email protected]([email protected]!1;N M8T/GBX 5;6_H;P7V,OZ MJ_O E9 M8_ [email protected]
The two main types of extensions API for WinDBG are: - WdbgExts - Old debugger extension interfaces has many limitations for symbol and type lookups - DbgEng - It is the new debugger interface, which the attached project is based.