#VU32739 Buffer overflow in Libxml2 - CVE-2012-5134

Vulnerability identifier: #VU32739

Vulnerability risk: Medium

CVSSv4.0: 2.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N/E:U/U:Green]

CVE-ID: CVE-2012-5134

CWE-ID: CWE-119

Exploitation vector: Network

Exploit availability: No

Vulnerable software:
Libxml2
Universal components / Libraries / Libraries used by multiple products

Vendor: Gnome Development Team

Description

The vulnerability allows a remote non-authenticated attacker to read and manipulate data.

Heap-based buffer underflow in the xmlParseAttValueComplex function in parser.c in libxml2 2.9.0 and earlier, as used in Google Chrome before 23.0.1271.91 and other products, allows remote attackers to cause a denial of service or possibly execute arbitrary code via crafted entities in an XML document.

Mitigation
Install update from vendor's website.

Vulnerable software versions

Libxml2: 6.0.19

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External links
https://git.gnome.org/browse/libxml2/commit/?id=6a36fbe3b3e001a8a840b5c1fdd81cefc9947f0d
https://googlechromereleases.blogspot.com/2012/11/stable-channel-update.html
https://lists.apple.com/archives/security-announce/2013/Oct/msg00009.html
https://lists.apple.com/archives/security-announce/2013/Sep/msg00006.html
https://lists.opensuse.org/opensuse-security-announce/2012-12/msg00004.html
https://lists.opensuse.org/opensuse-security-announce/2013-01/msg00023.html
https://lists.opensuse.org/opensuse-security-announce/2013-11/msg00002.html
https://rhn.redhat.com/errata/RHSA-2012-1512.html
https://rhn.redhat.com/errata/RHSA-2013-0217.html
https://secunia.com/advisories/51448
https://secunia.com/advisories/54886
https://secunia.com/advisories/55568
https://support.apple.com/kb/HT5934
https://support.apple.com/kb/HT6001
https://www.debian.org/security/2012/dsa-2580
https://www.mandriva.com/security/advisories?name=MDVSA-2013:056
https://www.securityfocus.com/bid/56684
https://www.securitytracker.com/id?1027815
https://www.ubuntu.com/usn/USN-1656-1
https://bugzilla.redhat.com/show_bug.cgi?id=880466
https://code.google.com/p/chromium/issues/detail?id=158249
https://exchange.xforce.ibmcloud.com/vulnerabilities/80294

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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.