sapi/cgi/cgi_main.c in the CGI component in PHP through 5.4.36, 5.5.x through 5.5.20, and 5.6.x through 5.6.4, when mmap is used to read a .php file, does not properly consider the mapping's length during processing of an invalid file that begins with a # character and lacks a newline character, which causes an out-of-bounds read and might (1) allow remote attackers to obtain sensitive information from php-cgi process memory by leveraging the ability to upload a .php file or (2) trigger unexpected code execution if a valid PHP script is present in memory locations adjacent to the mapping.

References

• https://nvd.nist.gov/vuln/detail/CVE-2014-9427
• https://bugs.php.net/bug.php?id=68618
• https://security.gentoo.org/glsa/201503-03
• https://support.apple.com/HT205267
• http://advisories.mageia.org/MGASA-2015-0040.html
• http://git.php.net/?p=php-src.git;a=commit;h=f9ad3086693fce680fbe246e4a45aa92edd2ac35
• http://lists.apple.com/archives/security-announce/2015/Sep/msg00008.html
• http://lists.opensuse.org/opensuse-security-announce/2015-02/msg00029.html
• http://lists.opensuse.org/opensuse-updates/2015-02/msg00079.html
• http://marc.info/?l=bugtraq&m=143748090628601&w=2
• http://marc.info/?l=bugtraq&m=144050155601375&w=2
• http://openwall.com/lists/oss-security/2014/12/31/6
• http://openwall.com/lists/oss-security/2015/01/01/1
• http://openwall.com/lists/oss-security/2015/01/03/4
• http://rhn.redhat.com/errata/RHSA-2015-1053.html
• http://rhn.redhat.com/errata/RHSA-2015-1066.html
• http://www.mandriva.com/security/advisories?name=MDVSA-2015:032
• http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
• http://www.securityfocus.com/bid/71833