Vulnerability CVE-2013-0339


Published: 2014-01-21

Description:
libxml2 through 2.9.1 does not properly handle external entities expansion unless an application developer uses the xmlSAX2ResolveEntity or xmlSetExternalEntityLoader function, which allows remote attackers to cause a denial of service (resource consumption), send HTTP requests to intranet servers, or read arbitrary files via a crafted XML document, aka an XML External Entity (XXE) issue. NOTE: it could be argued that because libxml2 already provides the ability to disable external entity expansion, the responsibility for resolving this issue lies with application developers; according to this argument, this entry should be REJECTed and each affected application would need its own CVE.

See advisories in our WLB2 database:
Topic
Author
Date
High
libxml2 and expat internal and external XML entity expansion
Kurt Seifried
22.02.2013
High
Apple iTunes 11.2.2 Insecure Libraries
Stefan Kanthak
08.07.2014
High
iTunes 11.2.2 for Windows: completely outdated and vulnerable 3rd party libraries
Stefan Kanthak
09.07.2014

CVSS2 => (AV:N/AC:M/Au:N/C:P/I:P/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
6.8/10
6.4/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial
Affected software
Xmlsoft -> Libxml2 
SUSE -> Linux enterprise server 
Debian -> Debian linux 
Canonical -> Ubuntu linux 

 References:
https://git.gnome.org/browse/libxml2/commit/?id=4629ee02ac649c27f9c0cf98ba017c6b5526070f
https://bugzilla.redhat.com/show_bug.cgi?id=915149
http://www.ubuntu.com/usn/USN-1904-2
http://www.ubuntu.com/usn/USN-1904-1
http://www.openwall.com/lists/oss-security/2013/04/12/6
http://www.debian.org/security/2013/dsa-2652
http://seclists.org/oss-sec/2013/q4/188
http://seclists.org/oss-sec/2013/q4/184
http://seclists.org/oss-sec/2013/q4/182
http://openwall.com/lists/oss-security/2013/02/22/3
http://openwall.com/lists/oss-security/2013/02/21/24
http://lists.opensuse.org/opensuse-security-announce/2013-11/msg00002.html

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