Input validation error in Libxml2

Published: 2013-04-26 | Updated: 2021-02-03

Risk	Medium
Patch available	YES
Number of vulnerabilities	1
CVE-ID	CVE-2013-0338
CWE-ID	CWE-20
Exploitation vector	Network
Public exploit	N/A
Vulnerable software	Apache Tomcat Server applications / Web servers
Vendor	Apache Foundation

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Input validation error

EUVDB-ID: #VU32708

Risk: Medium

CVSSv4.0: 2.7 [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-2013-0338

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

The vulnerability allows context-dependent attackers to perform a denial of service (DoS) attack.

The vulnerability exists due to insufficient validation of user-supplied input. A remote attacker can cause a denial of service (CPU and memory consumption) via an XML file containing an entity declaration with long replacement text and many references to this entity, aka "internal entity expansion" with linear complexity.

Mitigation

Install update from vendor's website.

Vulnerable software versions

Apache Tomcat: 6.0.19

CPE2.3

cpe:2.3:a:apache_foundation:apache_tomcat:6.0.19:*:*:*:*:*:*:*

External links

https://lists.opensuse.org/opensuse-security-announce/2013-11/msg00002.html
https://lists.opensuse.org/opensuse-updates/2013-03/msg00112.html
https://lists.opensuse.org/opensuse-updates/2013-03/msg00114.html
https://marc.info/?l=bugtraq&m=142798889927587&w=2
https://secunia.com/advisories/52662
https://secunia.com/advisories/55568
https://www.debian.org/security/2013/dsa-2652
https://www.mandriva.com/security/advisories?name=MDVSA-2013:056
https://www.oracle.com/technetwork/topics/security/cpujan2015-1972971.html
https://www.ubuntu.com/usn/USN-1782-1
https://bugzilla.redhat.com/show_bug.cgi?id=912400
https://git.gnome.org/browse/libxml2/commit/?id=23f05e0c33987d6605387b300c4be5da2120a7ab

Q & A

Can this vulnerability be exploited remotely?

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

How the attacker can exploit this vulnerability?

The attacker would have to send a specially crafted request to the affected application in order to exploit this vulnerability.

Is there known malware, which exploits this vulnerability?

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