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.
*CVSS:
| Base Score: | 5.3 |
| Access Vector: | Remote |
| Access Complexity: | Low |
| Authentication: | Not Required |
| Confidentiality Impact: | Partial |
| Integrity Impact: | Partial |
| Availability Impact: | None |
| Temporal Score: | 3.7 |
| Exploitability: | Unproven |
| Remediation Level: | Official-Fix |
| Report Confidence: | Uncorroborated |
Consequences:
Bypass Security
Remedy:
For Turbolinux:
Refer to Turbolinux Security Advisory TLSA-2006-38 for patch, upgrade, or suggested workaround information. See References.
References:
- Full-Disclosure Mailing List, Tue Oct 03 2006 - 15:38:30 CDT: Advisory 08/2006: PHP open_basedir Race Condition Vulnerability.
- 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
Platforms Affected:
- MandrakeSoft Mandrake Linux 2006 X86_64
- MandrakeSoft Mandrake Linux 2006
- MandrakeSoft Mandrake Linux 2007
- MandrakeSoft Mandrake Linux 2007 X86_64
- MandrakeSoft Mandrake Linux Corporate Server 3.0 X86_64
- MandrakeSoft Mandrake Linux Corporate Server 3.0
- MandrakeSoft Mandrake Linux Corporate Server 4.0 X86_64
- MandrakeSoft Mandrake Linux Corporate Server 4.0
- 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 RC3
- PHP PHP 5.0.0 RC2
- PHP PHP 5.0.0 RC1
- PHP PHP 5.0.0 Beta4
- 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
Reported:
Oct 03, 2006
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The information within this database may change without notice. Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. In no event shall IBM be held liable for any damages whatsoever arising out of or in connection with the use or spread of this information.