Description
The proc_open function in ext/standard/proc_open.c in PHP before 5.2.11 and 5.3.x before 5.3.1 does not enforce the (1) safe_mode_allowed_env_vars and (2) safe_mode_protected_env_vars directives, which allows context-dependent attackers to execute programs with an arbitrary environment via the env parameter, as demonstrated by a crafted value of the LD_LIBRARY_PATH environment variable.
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
- Kolang 4.3.10 < 5.3.0 - 'proc_open()' PHP 'safe_mode' Bypass EDB-11636 · webapps · Mar 5, 2010
Sources: PoC-in-GitHub, Metasploit Framework, Exploit-DB — updated daily. Only links are listed; no exploit code is hosted here.
References
- 40262 third-party-advisory
- oval:org.mitre.oval:def:7256 vdb-entry signature
- HPSBUX02543 vendor-advisory
- http://svn.php.net/viewvc/php/php-src/branches/PHP_5_2/ext/standard/proc_open.c?r1=286360&r2=286359&pathrev=286360
- [oss-security] 20091123 Re: CVE request: php 5.3.1 - proc_open() bypass PHP Bug #49026 [was: Re: CVE request: php 5.3.1 update] mailing-list
- 41490 third-party-advisory
- [oss-security] 20091123 Re: CVE request: php 5.3.1 - proc_open() bypass PHP Bug #49026 [was: Re: CVE request: php 5.3.1 update] mailing-list
- HPSBMA02568 vendor-advisory
- http://www.php.net/ChangeLog-5.php
- 37138 vdb-entry
- http://bugs.php.net/bug.php?id=49026
- 41480 third-party-advisory
- [oss-security] 20091122 Re: CVE request: php 5.3.1 update mailing-list
- http://svn.php.net/viewvc/?view=revision&revision=286360
- http://svn.php.net/viewvc/php/php-src/branches/PHP_5_3/ext/standard/proc_open.c?r1=286360&r2=286359&pathrev=286360
- MDVSA-2009:303 vendor-advisory