PHP symlink() open_basedir security bypass
| php-openbasedir-security-bypass (29340) |  Medium Risk |
Description:
A race condition in PHP could allow a remote attacker to bypass open_basedir security restrictions. A remote attacker could exploit this vulnerability using the symlink() function to bypass open_basedir restrictions and gain unauthorized access to restricted files.
Platforms Affected:
- MandrakeSoft, Mandrake Linux 2006
- MandrakeSoft, Mandrake Linux 2006 X86_64
- MandrakeSoft, Mandrake Linux 2007 X86_64
- MandrakeSoft, Mandrake Linux 2007
- MandrakeSoft, Mandrake Linux Corporate Server 3.0
- MandrakeSoft, Mandrake Linux Corporate Server 3.0 X86_64
- MandrakeSoft, Mandrake Linux Corporate Server 4.0
- MandrakeSoft, Mandrake Linux Corporate Server 4.0 X86_64
- MandrakeSoft, Mandrake Multi Network Firewall 2.0
- OpenPKG, OpenPKG 2-STABLE
- OpenPKG, OpenPKG CURRENT
- OpenPKG, OpenPKG Enterprise E1.0-SOLID
- PHP, PHP 5.0.0
- PHP, PHP 5.0.0 Beta4
- PHP, PHP 5.0.0 RC3
- PHP, PHP 5.0.0 RC2
- PHP, PHP 5.0.0 RC1
- PHP, PHP 5.0.0 Beta3
- PHP, PHP 5.0.0 Beta2
- PHP, PHP 5.0.0 Beta1
- PHP, PHP 5.0.1
- PHP, PHP 5.0.2
- PHP, PHP 5.0.3
- PHP, PHP 5.0.4
- PHP, PHP 5.0.5
- PHP, PHP 5.1.0
- PHP, PHP 5.1.1
- PHP, PHP 5.1.2
- PHP, PHP 5.1.3
- PHP, PHP 5.1.4
- PHP, PHP 5.1.5
- PHP, PHP 5.1.6
- Turbolinux, Turbolinux 10 Desktop
- Turbolinux, Turbolinux 10 F...
- Turbolinux, Turbolinux 10 Server
- Turbolinux, Turbolinux 10 Server x64 Ed
- Turbolinux, Turbolinux 8 Server
- Turbolinux, Turbolinux Home
- Turbolinux, Turbolinux Multimedia
- Turbolinux, Turbolinux Personal
- Turbolinux, Turbolinux
- Turbolinux, Turbolinux Appliance Server 1.0 Hosting Ed
- Turbolinux, Turbolinux Appliance Server 1.0 Workgroup Ed
- Turbolinux, Turbolinux Appliance Server 2.0
Remedy:
For Turbolinux:
Refer to Turbolinux Security Advisory TLSA-2006-38 for patch, upgrade, or suggested workaround information. See References.
Consequences:
Bypass Security
References:
- Full-Disclosure Mailing List, Tue Oct 03 2006 - 15:38:30 CDT, Advisory 08/2006: PHP open_basedir Race Condition Vulnerability at http://archives.neohapsis.com/archives/fulldisclosure/2006-10/0065.html.
- BID-20326: PHP Symbolic Link Open_Basedir Bypass Vulnerability
- CVE-2006-5178: Race condition in the symlink function in PHP 5.1.6 and earlier allows local users to bypass the open_basedir restriction by using a combination of symlink, mkdir, and unlink functions to change the file path after the open_basedir check and before the file is opened by the underlying system, as demonstrated by symlinking a symlink into a subdirectory, to point to a parent directory via .. (dot dot) sequences, and then unlinking the resulting symlink.
- MDKSA-2006:185: Updated php packages to address multiple vulnerabilities
- OpenPKG-SA-2006.023: PHP
- SA22235: PHP "open_basedir" Symlink Security Bypass Vulnerability
- SECTRACK ID: 1016977: PHP Race Condition Lets Users Bypass open_basedir Restrictions
Reported:
Oct 03, 2006
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