Search Results for: debug ike
The Honeypot Incident – How strong is your UF (Reversing FU)
Interested in capturing, documenting and analyzing scans and malicious activity, Corelan Team decided to set up a honeypot and put it online. In the first week of december 2010, Obzy built a machine (default Windows XP SP3 installation, no patches, firewall turned off), named it “EGYPTS-AIRWAYS”, set up a honeypot + some other monitoring tools, and connected it to the internet.
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Malicious pdf analysis : from price.zip to flashplayer.exe
This morning, my generic attachment filter for MS Exchange reported that about 100 emails were put in quarantine because they contained a small zip file.
When looking inside the zip file, I found a small pdf file… I immediately figured this file was up to no good, so it was time to get my hands dirty :)
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Offensive Security Exploit Weekend
Introduction I’m excited and honored to be able to announce that Sud0, one of our Corelan Team members, has won the Offensive Security Exploit weekend, an exploiting exercise only available to Offensive Security certified alumni. The challenge was built around a vulnerability in Foxit Reader. Each participant was pointed to a Proof of Concept exploit, […]
Metasploit module : HTTP Form field fuzzer
Introduction About a month after releasing an ftp client fuzzer module for Metasploit, I decided to release yet another fuzzer module I have been working on over the last few weeks. This new module can be used to audit web servers/web server plugins/components/filters, by fuzzing form fields and optionally fuzz some header fields. While this […]
In Memory Fuzzing
Introduction In memory fuzzing is a technique that allows the analyst to bypass parsers; network-related limitations such as max connections, buit-in IDS or flooding protection; encrypted or unknown (poorly documented) protocol in order to fuzz the actual underlying assembly routines that are potentially vulnerable. Prior to the development of my fuzzing toolset, I was unsatisfied […]
Death of an ftp client / Birth of Metasploit modules
Over the past few weeks, Corelan Team has given its undivided attention to fuzzing ftp client applications.
Using a custom built ftp client fuzzer, now part of the Metasploit framework, the team has audited several ftp clients and applications that use an embedded client ftp component. One example of such an application is a tool that would synchronize / backup data from a computer to a remote ftp server.
The 3 main audit/attack vectors that were used during the “project” were
send back overly long responses to ftp commands / requests sent by the ftp client to the server
send back a file/directory listing that contains overly long file/folder names
try to download a file that has an overly long filename.
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Exploit writing tutorial part 10 : Chaining DEP with ROP – the Rubik’s[TM] Cube
About 3 months after finishing my previous exploit writing related tutorial, I finally found some time and fresh energy to start writing a new article.
In the previous tutorials, I have explained the basics of stack based overflows and how they can lead to arbitrary code execution. I discussed direct RET overflows, SEH based exploits, Unicode and other character restrictions, the use of debugger plugins to speed up exploit development, how to bypass common memory protection mechanisms and how to write your own shellcode.
While the first tutorials were really written to learn the basics about exploit development, starting from scratch (targeting people without any knowledge about exploit development) you have most likely discovered that the more recent tutorials continue to build on those basics and require solid knowledge of asm, creative thinking, and some experience with exploit writing in general.
Today’s tutorial is no different. I will continue to build upon everything we have seen and learned in the previous tutorials. Today I will talk about ROP and how it can be used to bypass DEP (and ASLR)…
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Exploiting Ken Ward Zipper : Taking advantage of payload conversion
In the article I wrote on the abysssec.com website, I explained the steps and techniques needed to build a working exploit for Ken Ward’s zipper. One of the main difficulties I had to overcome when building the exploit, was the character set limitation. I basically could only use a subset of the ascii characters (only […]
QuickZip Stack BOF 0day: a box of chocolates
Over the last couple of weeks, ever since I published 2 articles on the Offensive Blog, I have received many requests from people asking me if they could get a copy of those articles in pdf format. My blog does not include a pdf generator, but it has a “print” button, so you can get […]
Exploit writing tutorial part 9 : Introduction to Win32 shellcoding
Over the last couple of months, I have written a set of tutorials about building exploits that target the Windows stack. One of the primary goals of anyone writing an exploit is to modify the normal execution flow of the application and trigger the application to run arbitrary code… code that is injected by the […]
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