buffer overflow

Metasploit module : HTTP Form field fuzzer

Published November 12, 2010 |

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 […]

Posted in 001_Security, Exploits, Web Application Security | Tagged action, audit, auxiliary, buffer overflow, crash, fields, form, form field, fuzz, fuzzer, fuzzing, get, header, http, metasploit, module, option, parameter, password, post, request, rport, url, vhost, webserver

Exploit writing tutorial part 6 : Bypassing Stack Cookies, SafeSeh, SEHOP, HW DEP and ASLR

Published September 21, 2009 |

By Peter Van Eeckhoutte (corelanc0d3r)

Introduction In all previous tutorials in this Exploit writing tutorial series, we have looked at building exploits that would work on Windows XP / 2003 server. The success of all of these exploits (whether they are based on direct ret overwrite or exception handler structure overwrites) are based on the fact that a reliable return […]

Posted in 001_Security, Exploit Writing Tutorials, Exploits | Tagged !aslrdynamicbase, 2003, 4141414, 8, access violation, add esp, address space layout randomization, adjust ebp, adjust esi, alwaysoff, alwayson, aslr, before function returns, buffer, buffer overflow, bypass, call, compiler, cookie, data execution prevention, dep, dword ptr, exception handler, exploit, gs, hack, handler, immdbg, immunity, jmp, jump, Kifastsystemcallret, ldrpchecknxcompatibility, linker, loaded module, mov al, moveimages, next seh, non exec, nseh, ntsetinformationprocess, nx, ollydbg, optin, optout, partial overwrite, plugin, prevention, processexecute, protection, protectvirtualmemory, pvefindaddr, pycommand, python, ret2libc, safeseh, saved ebp, saved eip, se handler, se structure, sehop, stack, stack overflow, switch, virtual function call, vista, windbg, windows 7, xd, xp

Exploit writing tutorial part 3 : SEH Based Exploits

Published July 25, 2009 |

By Peter Van Eeckhoutte (corelanc0d3r)

In the first 2 parts of the exploit writing tutorial series, I have discussed how a classic stack buffer overflow works and how you can build a reliable exploit by using various techniques to jump to the shellcode. The example we have used allowed us to directly overwrite EIP and we had a pretty large […]

Posted in 001_Security, Exploit Writing Tutorials, Exploits | Tagged !exploitable, buffer, buffer overflow, cygwin, dep, dll modload, exception, exception handler, exploit, exploit laboratory, fs:[0], handler, memdump, msec.dll, msfpescan, next seh, ollydbg, pop pop ret, safeseh, seh, shellcode, stack, stack overflow, teb, tib, windbg

Exploit writing tutorial part 2 : Stack Based Overflows – jumping to shellcode

Published July 23, 2009 |

By Peter Van Eeckhoutte (corelanc0d3r)

Where do you want to jmp today ? In one of my previous posts (part 1 of writing stack based buffer overflow exploits), I have explained the basisc about discovering a vulnerability and using that information to build a working exploit. In the example I have used in that post, we have seen that ESP […]

Posted in 001_Security, Exploit Writing Tutorials, Exploits | Tagged 41414141, add esp, blind return, buffer, buffer overflow, bytes, dll, eip, findjmp, jmp, jmp esp, jumpcode, metasploit, nop, opcode, pop, pop pop ret, push ret, pwned, reg + offset, ret, shellcode, stack

Exploit writing tutorial part 1 : Stack Based Overflows

Published July 19, 2009 |

By Peter Van Eeckhoutte (corelanc0d3r)

Last friday (july 17th 2009), somebody (nick)named ‘Crazy_Hacker’ has reported a vulnerability in Easy RM to MP3 Conversion Utility (on XP SP2 En), via packetstormsecurity.org. (see http://packetstormsecurity.org/0907-exploits/). The vulnerability report included a proof of concept exploit (which, by the way, failed to work on my MS Virtual PC based XP SP3 En). Another exploit was […]

Posted in 001_Security, Exploit Writing Tutorials, Exploits | Tagged 41414141, buffer, buffer overflow, buffersize, bytes, discover, ebp, eip, esp, exploit, exploit laboratory, exploit writing tutorial, hack, learn, metasploit, nop, nop sled, nop slide, overflow, pattern_create, pattern_offset, pop, push, register, saumil shah, shellcode, sk chong, stack, stack overflow, write

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Metasploit module : HTTP Form field fuzzer

Exploit writing tutorial part 3 : SEH Based Exploits

Exploit writing tutorial part 2 : Stack Based Overflows – jumping to shellcode

Exploit writing tutorial part 1 : Stack Based Overflows

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