Description
Interpretation conflict in ModSecurity (mod_security) 2.1.0 and earlier allows remote attackers to bypass request rules via application/x-www-form-urlencoded POST data that contains an ASCIIZ (0x00) byte, which mod_security treats as a terminator even though it is still processed as normal data by some HTTP parsers including PHP 5.2.0, and possibly parsers in Perl, and Python.
Public exploits
Exploit or proof-of-concept code for this vulnerability is publicly available, which lowers the bar for attackers. Treat it as a reason to patch sooner.
Third-party code, not reviewed by us. Public PoCs are sometimes fake or contain malware. Read the code first and run it only in an isolated lab, against systems you are authorised to test.
Exploit-DB 1
- mod_security 2.1.0 - ASCIIZ byte POST Rules Bypass EDB-3425 · remote · Mar 7, 2007 · verified
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- http://www.oracle.com/technetwork/topics/security/cpujul2008-090335.html
- ADV-2008-2115 vdb-entry
- modsecurity-formurlencoded-security-bypass(32872) vdb-entry
- ADV-2007-0868 vdb-entry
- SSRT061201 vendor-advisory
- http://www.php-security.org/MOPB/BONUS-12-2007.html
- http://www.modsecurity.org/blog/archives/2007/03/modsecurity_asc.html
- 25316 third-party-advisory
- ADV-2008-2109 vdb-entry
- 24373 third-party-advisory
- 31087 third-party-advisory
- GLSA-200705-17 vendor-advisory
- 31113 third-party-advisory
- 22831 vdb-entry
- 32778 vdb-entry