Permissions, Privileges, and Access Controls in PHP

1) Permissions, Privileges, and Access Controls

EUVDB-ID: #VU32548

Risk: Medium

CVSSv3.1: 4.6 [CVSS:3.1/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:U/RL:O/RC:C]

CVE-ID: CVE-2013-7345

CWE-ID: CWE-264 - Permissions, Privileges, and Access Controls

Exploit availability: No

Description

The vulnerability allows a remote non-authenticated attacker to perform service disruption.

The BEGIN regular expression in the awk script detector in magic/Magdir/commands in file before 5.15 uses multiple wildcards with unlimited repetitions, which allows context-dependent attackers to cause a denial of service (CPU consumption) via a crafted ASCII file that triggers a large amount of backtracking, as demonstrated via a file with many newline characters.

Mitigation

Install update from vendor's website.

Vulnerable software versions

PHP: 5.0 - 5.6.40

External links

http://bugs.gw.com/view.php?id=164
http://rhn.redhat.com/errata/RHSA-2014-1765.html
http://support.apple.com/kb/HT6443
http://www.debian.org/security/2014/dsa-2873
http://bugs.debian.org/cgi-bin/bugreport.cgi?bug=703993
http://github.com/file/file/commit/ef2329cf71acb59204dd981e2c6cce6c81fe467c

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.