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.
CVSS Severity (version 2.0):
Impact Subscore: 4.9
Exploitability Subscore: 3.4
CVSS Version 2 Metrics:
Access Vector: Locally exploitable
Access Complexity: Medium
Authentication: Not required to exploit
Impact Type: Allows unauthorized modification; Allows disruption of service
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[oss-security] 20140606 Re: CVE request: PHP configure script and Lynis tool /tmp/ issues reported on full disclosure
20140604 More /tmp fun (PHP, Lynis)