National Cyber-Alert System

Vulnerability Summary for CVE-2006-5178

Overview

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.

Impact

CVSS Severity (version 2.0):

CVSS Version 2 Metrics:

Vendor Statments (disclaimer)

Official Statement from Red Hat (12/04/2006)

We do not consider these to be security issues. For more details see http://bugzilla.redhat.com/bugzilla/show_bug.cgi?id=169857#c1 and http://www.php.net/security-note.php

References to Advisories, Solutions, and Tools

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External Source: XF

Name: php-openbasedir-security-bypass(29340)

Hyperlink:http://xforce.iss.net/xforce/xfdb/29340

External Source: BID

Name: 20326

Hyperlink:http://www.securityfocus.com/bid/20326

External Source: BUGTRAQ

Name: 20061009 PHP open_basedir with symlink() function Race Condition PoC exploit

Hyperlink:http://www.securityfocus.com/archive/1/archive/1/448020/100/0/threaded

External Source: BUGTRAQ

Name: 20061003 Advisory 08/2006: PHP open_basedir Race Condition Vulnerability

Type: Advisory

Hyperlink:http://www.securityfocus.com/archive/1/archive/1/447649/100/0/threaded

External Source: MISC

Name: http://www.neosecurityteam.net/index.php?action=advisories&id=26

Hyperlink:http://www.neosecurityteam.net/index.php?action=advisories&id=26

External Source: MISC

Name: http://www.hardened-php.net/advisory_082006.132.html

Type: Advisory

Hyperlink:http://www.hardened-php.net/advisory_082006.132.html

External Source: VUPEN

Name: ADV-2006-3901

Type: Advisory

Hyperlink:http://www.frsirt.com/english/advisories/2006/3901

External Source: SECTRACK

Name: 1016977

Hyperlink:http://securitytracker.com/id?1016977

External Source: SECUNIA

Name: 22235

Type: Advisory

Hyperlink:http://secunia.com/advisories/22235

External Source: FULLDISC

Name: 20061003 Advisory 08/2006: PHP open_basedir Race Condition Vulnerability

Hyperlink:http://lists.grok.org.uk/pipermail/full-disclosure/2006-October/049850.html

External Source: TURBO

Name: TLSA-2006-38

Hyperlink:http://www.turbolinux.com/security/2006/TLSA-2006-38.txt

External Source: OPENPKG

Name: OpenPKG-SA-2006.023

Hyperlink:http://www.securityfocus.com/archive/1/archive/1/448953/100/0/threaded

External Source: MANDRIVA

Name: MDKSA-2006:185

Hyperlink:http://www.mandriva.com/security/advisories?name=MDKSA-2006:185

External Source: SREASON

Name: 1692

Hyperlink:http://securityreason.com/securityalert/1692

External Source: SECUNIA

Name: 22424

Hyperlink:http://secunia.com/advisories/22424

External Source: MANDRIVA

Name: MDKSA-2006:185

Hyperlink:http://frontal2.mandriva.com/security/advisories?name=MDKSA-2006:185