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UNIRAS Brief - 103/04 - RedHat security Advisory



 
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   UNIRAS (UK Govt CERT) Briefing Notice - 103/04 dated 04.03.04  Time: 12:15 
  UNIRAS is part of NISCC (National Infrastructure Security Co-ordination Centre)
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  UNIRAS material is also available from its website at www.uniras.gov.uk and
         Information about NISCC is available from www.niscc.gov.uk
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Title
=====

Updated libxml2 packages fix security vulnerability.

Detail
====== 

Updated libxml2 packages that fix an overflow when parsing remote resources are now available.



                     ESB-2004.0178 -- RHSA-2004:091-02
            Updated libxml2 packages fix security vulnerability
                               04 March 2004


Product:                libxml2
Publisher:              Red Hat
Operating System:       Red Hat Linux 9
                        Linux
Impact:                 Execute Arbitrary Code/Commands
Access Required:        Remote
CVE Names:              CAN-2004-0110

Ref:                    ESB-2004.0166

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                   Red Hat Security Advisory

Synopsis:          Updated libxml2 packages fix security vulnerability
Advisory ID:       RHSA-2004:091-02
Issue date:        2004-03-03
Updated on:        2004-03-03
Product:           Red Hat Linux
Keywords:          
Cross references:  
Obsoletes:         
CVE Names:         CAN-2004-0110
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1. Topic:

Updated libxml2 packages that fix an overflow when parsing remote resources are now available.

[Updated 3 March 2004]
Revised libxml2 packages are now available as the original packages did not contain a complete patch.

2. Relevant releases/architectures:

Red Hat Linux 9 - i386

3. Problem description:

libxml2 is a library for manipulating XML files.

Yuuichi Teranishi discovered a flaw in libxml2 versions prior to 2.6.6. 
When fetching a remote resource via FTP or HTTP, libxml2 uses special parsing routines.  These routines can overflow a buffer if passed a very long URL.  If an attacker is able to find an application using libxml2 that parses remote resources and allows them to influence the URL, then this flaw could be used to execute arbitrary code.  The Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned the name CAN-2004-0110 to this issue.

All users are advised to upgrade to these updated packages, which contain a backported fix and are not vulnerable to this issue.

4. Solution:

Before applying this update, make sure all previously released errata relevant to your system have been applied.

To update all RPMs for your particular architecture, run:

rpm -Fvh [filenames]

where [filenames] is a list of the RPMs you wish to upgrade.  Only those RPMs which are currently installed will be updated.  Those RPMs which are not installed but included in the list will not be updated.  Note that you can also use wildcards (*.rpm) if your current directory *only* contains the desired RPMs.

Please note that this update is also available via Red Hat Network.  Many people find this an easier way to apply updates.  To use Red Hat Network, launch the Red Hat Update Agent with the following command:

up2date

This will start an interactive process that will result in the appropriate RPMs being upgraded on your system.

If up2date fails to connect to Red Hat Network due to SSL Certificate Errors, you need to install a version of the up2date client with an updated certificate.  The latest version of up2date is available from the Red Hat FTP site and may also be downloaded directly from the RHN website:

https://rhn.redhat.com/help/latest-up2date.pxt

5. RPMs required:

Red Hat Linux 9:

SRPMS: ftp://updates.redhat.com/9/en/os/SRPMS/libxml2-2.5.4-3.rh9.src.rpm

i386: ftp://updates.redhat.com/9/en/os/i386/libxml2-2.5.4-3.rh9.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/libxml2-devel-2.5.4-3.rh9.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/libxml2-python-2.5.4-3.rh9.i386.rpm



6. Verification:

MD5 sum                          Package Name
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cb550a537cbc60b95dcc4396ab419466 9/en/os/SRPMS/libxml2-2.5.4-3.rh9.src.rpm
b063360d9efb8f4de082f1324fdcd421 9/en/os/i386/libxml2-2.5.4-3.rh9.i386.rpm
8590c8fcd8268d3b682531a4428f14f8 9/en/os/i386/libxml2-devel-2.5.4-3.rh9.i386.rpm
d34886934ad6c00607e0117815bc1e0a 9/en/os/i386/libxml2-python-2.5.4-3.rh9.i386.rpm

These packages are GPG signed by Red Hat for security.  Our key is available from https://www.redhat.com/security/keys.html

You can verify each package with the following command:
    
    rpm --checksig -v <filename>

If you only wish to verify that each package has not been corrupted or tampered with, examine only the md5sum with the following command:
    
    md5sum <filename>


7. References:

http://mail.gnome.org/archives/xml/2004-February/msg00070.html
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0110

8. Contact:

The Red Hat security contact is <secalert@xxxxxxxxxx>.  More contact details at https://www.redhat.com/solutions/security/news/contact.html

Copyright 2003 Red Hat, Inc.
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UNIRAS wishes to acknowledge the contributions of RedHat for the information 
contained in this Briefing. 
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This Briefing contains the information released by the original author. Some 
of the information may have changed since it was released. If the vulnerability 
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<End of UNIRAS Briefing>

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