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Libxml2 URI Parsing Buffer Overflow Vulnerabilities


1.  Gentoo Linux Security Advisory

Version Information

Advisory Reference GLSA 200403-01 / libxml
Release Date March 05, 2004
Latest Revision March 05, 2004: 01
Impact normal
Exploitable local and remote combination
Package Vulnerable versions Unaffected versions Architecture(s)
dev-libs/libxml2 < 2.6.6 >= 2.6.6 All supported architectures

Related bugreports: #42735


A buffer overflow has been discovered in libxml2 versions prior to 2.6.6 which may be exploited by an attacker allowing the execution of arbitrary code.

2.  Impact Information


Yuuichi Teranishi discovered a flaw in libxml2 versions prior to 2.6.6. When the libxml2 library fetches a remote resource via FTP or HTTP, libxml2 uses parsing routines that can overflow a buffer caused by improper bounds checking if they are passed a URL longer than 4096 bytes.


If an attacker is able to exploit an application using libxml2 that parses remote resources, then this flaw could be used to execute arbitrary code.

3.  Resolution Information


No workaround is available; users are urged to upgrade libxml2 to 2.6.6.


All users are recommended to upgrade their libxml2 installation:

Code Listing 3.1: Resolution

# emerge sync
# emerge -pv ">=dev-libs/libxml2-2.6.6"
# emerge ">=dev-libs/libxml2-2.6.6"

4.  References


Page updated March 05, 2004

Summary: This is a Gentoo Linux Security Advisory

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