(Gentoo Issues Fix) Libxml2 URL Parsing Buffer Overflow May Let Remote Users Execute Arbitrary Code
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SecurityTracker Alert ID: 1009341 |
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SecurityTracker URL: http://securitytracker.com/id/1009341
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CVE Reference:
CAN-2004-0110
(Links to External Site)
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Date: Mar 8 2004
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Impact:
Execution of arbitrary code via network, User access via network
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Fix Available: Yes Vendor Confirmed: Yes
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Version(s): prior to 2.6.6
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Description:
A buffer overflow vulnerability was reported in Libxml2. A remote user may be able to execute arbitrary code on an application that uses Libxml2.
It is reported that there is an overflow in libxml2 that can be triggered when parsing remote resources via FTP or HTTP. A long URL can trigger the overflow, the report said.
The flaw reportedly resides in 'nanoftp.c' and 'nanohttp.c'
Yuuichi Teranishi is credited with discovering the flaw.
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Impact:
A remote user may be able to cause a target application that uses Libxml2 to execute arbitrary code with the privileges of the target application. The specific impact depends on the application using Libxml2.
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Solution:
Gentoo has released a fix in version 2.6.6 and urges users to upgrade:
~ # emerge sync
~ # emerge -pv ">=dev-libs/libxml2-2.6.6"
~ # emerge ">=dev-libs/libxml2-2.6.6"
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Vendor URL: www.xmlsoft.org/index.html (Links to External Site)
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Cause:
Boundary error
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Underlying OS:
Linux (Gentoo)
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Message History:
This archive entry is a follow-up to the message listed below.
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Source Message Contents
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Date: Sat, 06 Mar 2004 23:25:58 +0000
Subject: [gentoo-announce] [ GLSA 200403-01 ] Libxml2 URI Parsing Buffer Overflow Vulnerabilities
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-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1
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Gentoo Linux Security Advisory GLSA 200403-01
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~ http://security.gentoo.org
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~ Severity: Normal
~ Title: Libxml2 URI Parsing Buffer Overflow Vulnerabilities
~ Date: March 06, 2004
~ Bugs: #42735
~ ID: 200403-01
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Synopsis
========
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.
Description
===========
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.
Impact
======
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.
Workaround
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No workaround is available; users are urged to upgrade libxml2 to
2.6.6.
Resolution
==========
All users are recommended to upgrade their libxml2 installation:
~ # emerge sync
~ # emerge -pv ">=dev-libs/libxml2-2.6.6"
~ # emerge ">=dev-libs/libxml2-2.6.6"
References
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~ [ 1 ] http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0110
Concerns?
=========
Security is a primary focus of Gentoo Linux and ensuring the
confidentiality and security of our users machines is of utmost
importance to us. Any security concerns should be addressed to
security@gentoo.org or alternatively, you may file a bug at
http://bugs.gentoo.org.
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