Resource management error in expat - CVE-2012-0876
Published: July 3, 2012 / Updated: August 3, 2020
Vulnerability identifier: #VU33114
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2012-0876
CWE-ID: CWE-399
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: libexpat.org
Affected software:
expat
expat
Detailed vulnerability description
The vulnerability allows a remote non-authenticated attacker to perform service disruption.
The XML parser (xmlparse.c) in expat before 2.1.0 computes hash values without restricting the ability to trigger hash collisions predictably, which allows context-dependent attackers to cause a denial of service (CPU consumption) via an XML file with many identifiers with the same value.
How to mitigate CVE-2012-0876
Install update from vendor's website.
Sources
- http://bugs.python.org/issue13703#msg151870
- http://lists.apple.com/archives/security-announce/2013/Oct/msg00004.html
- http://lists.apple.com/archives/security-announce/2015/Dec/msg00005.html
- http://mail.libexpat.org/pipermail/expat-discuss/2012-March/002768.html
- http://rhn.redhat.com/errata/RHSA-2012-0731.html
- http://rhn.redhat.com/errata/RHSA-2016-0062.html
- http://rhn.redhat.com/errata/RHSA-2016-2957.html
- http://secunia.com/advisories/49504
- http://secunia.com/advisories/51024
- http://secunia.com/advisories/51040
- http://sourceforge.net/projects/expat/files/expat/2.1.0/
- http://sourceforge.net/tracker/?func=detail&atid=110127&aid=3496608&group_id=10127
- http://www.debian.org/security/2012/dsa-2525
- http://www.mandriva.com/security/advisories?name=MDVSA-2012:041
- http://www.oracle.com/technetwork/topics/security/bulletinjul2016-3090568.html
- http://www.securityfocus.com/bid/52379
- http://www.ubuntu.com/usn/USN-1527-1
- http://www.ubuntu.com/usn/USN-1613-1
- http://www.ubuntu.com/usn/USN-1613-2
- https://support.apple.com/HT205637
- https://www.tenable.com/security/tns-2016-20