CVE-2014-3981

acinclude.m4, as used in the configure script in PHP 5.5.13 and earlier, allows local users to overwrite arbitrary files via a symlink attack on the /tmp/phpglibccheck file.

Weakness

The product attempts to access a file based on the filename, but it does not properly prevent that filename from identifying a link or shortcut that resolves to an unintended resource.

Affected Software

Potential Mitigations

• Follow the principle of least privilege when assigning access rights to entities in a software system.
• Denying access to a file can prevent an attacker from replacing that file with a link to a sensitive file. Ensure good compartmentalization in the system to provide protected areas that can be trusted.

Related Attack Patterns

• https://cwe.mitre.org/data/definitions/132.html
• https://cwe.mitre.org/data/definitions/17.html
• https://cwe.mitre.org/data/definitions/35.html
• https://cwe.mitre.org/data/definitions/76.html

References

• http://git.php.net/?p=php-src.git%3Ba=commit%3Bh=91bcadd85e20e50d3f8c2e9721327681640e6f16
• http://lists.apple.com/archives/security-announce/2015/Apr/msg00001.html
• http://marc.info/?l=bugtraq\u0026m=141017844705317\u0026w=2
• http://marc.info/?l=bugtraq\u0026m=141390017113542\u0026w=2
• http://openwall.com/lists/oss-security/2014/06/06/12
• http://seclists.org/fulldisclosure/2014/Jun/21
• http://support.apple.com/kb/HT6443
• http://www-01.ibm.com/support/docview.wss?uid=swg21683486
• http://www.oracle.com/technetwork/topics/security/bulletinjan2015-2370101.html
• https://bugs.php.net/bug.php?id=67390
• https://bugzilla.redhat.com/show_bug.cgi?id=1104978
• https://support.apple.com/HT204659