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Category:   Application (Generic)  >   Libxml2 Vendors:   xmlsoft.org
(Red Hat Issues Fix) Libxml2 UTF-8 Validation Flaw Lets Remote Users Deny Service
SecurityTracker Alert ID:  1019183
SecurityTracker URL:  http://securitytracker.com/id/1019183
CVE Reference:   CVE-2007-6284   (Links to External Site)
Date:  Jan 11 2008
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 2.6.31
Description:   A vulnerability was reported in Libxml2. A remote user can cause denial of service conditions.

A remote user can send specially crafted data to a target application that uses the libxml UTF-8 decoding function to cause the library to enter an infinite loop.

The vulnerability resides in the xmlCurrentChar() function and can be triggered by certain multibyte combinations.

Brad Fitzpatrick of Google reported this vulnerability.

Impact:   A remote user can cause the target application to enter an infinite loop and consume excessive CPU resources on the target system.
Solution:   Red Hat has released a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2008-0032.html

Vendor URL:  www.xmlsoft.org/ (Links to External Site)
Cause:   Input validation error, State error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  2.1, 3, 4, 5

Message History:   This archive entry is a follow-up to the message listed below.
Jan 11 2008 Libxml2 UTF-8 Validation Flaw Lets Remote Users Deny Service



 Source Message Contents

Subject:  [RHSA-2008:0032-01] Important: libxml2 security update


-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

=====================================================================
                   Red Hat Security Advisory

Synopsis:          Important: libxml2 security update
Advisory ID:       RHSA-2008:0032-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2008-0032.html
Issue date:        2008-01-11
CVE Names:         CVE-2007-6284 
=====================================================================

1. Summary:

Updated libxml2 packages that fix a security issue are now available.

This update has been rated as having important security impact by the Red
Hat Security Response Team.

2. Relevant releases/architectures:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1  - i386, ia64
Red Hat Linux Advanced Workstation 2.1 - ia64
Red Hat Enterprise Linux ES version 2.1 - i386
Red Hat Enterprise Linux WS version 2.1 - i386
Red Hat Enterprise Linux AS version 3 - i386, ia64, ppc, s390, s390x, x86_64
Red Hat Desktop version 3 - i386, x86_64
Red Hat Enterprise Linux ES version 3 - i386, ia64, x86_64
Red Hat Enterprise Linux WS version 3 - i386, ia64, x86_64
Red Hat Enterprise Linux AS version 4 - i386, ia64, ppc, s390, s390x, x86_64
Red Hat Enterprise Linux Desktop version 4 - i386, x86_64
Red Hat Enterprise Linux ES version 4 - i386, ia64, x86_64
Red Hat Enterprise Linux WS version 4 - i386, ia64, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64
RHEL Desktop Workstation (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64

3. Description:

The libxml2 packages provide a library that allows you to manipulate XML
files. It includes support to read, modify, and write XML and HTML files.

A denial of service flaw was found in the way libxml2 processes certain
content. If an application linked against libxml2 processes malformed XML
content, it could cause the application to stop responding. (CVE-2007-6284)

Red Hat would like to thank the Google Security Team for responsibly
disclosing this issue.

All users are advised to upgrade to these updated packages, which contain a
backported patch to resolve this issue.

4. Solution:

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

This update is available via Red Hat Network.  Details on how to use 
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/FAQ_58_10188

5. Bugs fixed (http://bugzilla.redhat.com/):

425927 - CVE-2007-6284 libxml2: infinite loop in UTF-8 decoding

6. Package List:

Red Hat Enterprise Linux AS (Advanced Server) version 2.1 :

Source:
ftp://updates.redhat.com/enterprise/2.1AS/en/os/SRPMS/libxml2-2.4.19-7.ent.src.rpm

i386:
libxml2-2.4.19-7.ent.i386.rpm
libxml2-devel-2.4.19-7.ent.i386.rpm
libxml2-python-2.4.19-7.ent.i386.rpm

ia64:
libxml2-2.4.19-7.ent.ia64.rpm
libxml2-devel-2.4.19-7.ent.ia64.rpm
libxml2-python-2.4.19-7.ent.ia64.rpm

Red Hat Linux Advanced Workstation 2.1:

Source:
ftp://updates.redhat.com/enterprise/2.1AW/en/os/SRPMS/libxml2-2.4.19-7.ent.src.rpm

ia64:
libxml2-2.4.19-7.ent.ia64.rpm
libxml2-devel-2.4.19-7.ent.ia64.rpm
libxml2-python-2.4.19-7.ent.ia64.rpm

Red Hat Enterprise Linux ES version 2.1:

Source:
ftp://updates.redhat.com/enterprise/2.1ES/en/os/SRPMS/libxml2-2.4.19-7.ent.src.rpm

i386:
libxml2-2.4.19-7.ent.i386.rpm
libxml2-devel-2.4.19-7.ent.i386.rpm
libxml2-python-2.4.19-7.ent.i386.rpm

Red Hat Enterprise Linux WS version 2.1:

Source:
ftp://updates.redhat.com/enterprise/2.1WS/en/os/SRPMS/libxml2-2.4.19-7.ent.src.rpm

i386:
libxml2-2.4.19-7.ent.i386.rpm
libxml2-devel-2.4.19-7.ent.i386.rpm
libxml2-python-2.4.19-7.ent.i386.rpm

Red Hat Enterprise Linux AS version 3:

Source:
ftp://updates.redhat.com/enterprise/3AS/en/os/SRPMS/libxml2-2.5.10-8.src.rpm

i386:
libxml2-2.5.10-8.i386.rpm
libxml2-debuginfo-2.5.10-8.i386.rpm
libxml2-devel-2.5.10-8.i386.rpm
libxml2-python-2.5.10-8.i386.rpm

ia64:
libxml2-2.5.10-8.i386.rpm
libxml2-2.5.10-8.ia64.rpm
libxml2-debuginfo-2.5.10-8.i386.rpm
libxml2-debuginfo-2.5.10-8.ia64.rpm
libxml2-devel-2.5.10-8.ia64.rpm
libxml2-python-2.5.10-8.ia64.rpm

ppc:
libxml2-2.5.10-8.ppc.rpm
libxml2-2.5.10-8.ppc64.rpm
libxml2-debuginfo-2.5.10-8.ppc.rpm
libxml2-debuginfo-2.5.10-8.ppc64.rpm
libxml2-devel-2.5.10-8.ppc.rpm
libxml2-python-2.5.10-8.ppc.rpm

s390:
libxml2-2.5.10-8.s390.rpm
libxml2-debuginfo-2.5.10-8.s390.rpm
libxml2-devel-2.5.10-8.s390.rpm
libxml2-python-2.5.10-8.s390.rpm

s390x:
libxml2-2.5.10-8.s390.rpm
libxml2-2.5.10-8.s390x.rpm
libxml2-debuginfo-2.5.10-8.s390.rpm
libxml2-debuginfo-2.5.10-8.s390x.rpm
libxml2-devel-2.5.10-8.s390x.rpm
libxml2-python-2.5.10-8.s390x.rpm

x86_64:
libxml2-2.5.10-8.i386.rpm
libxml2-2.5.10-8.x86_64.rpm
libxml2-debuginfo-2.5.10-8.i386.rpm
libxml2-debuginfo-2.5.10-8.x86_64.rpm
libxml2-devel-2.5.10-8.x86_64.rpm
libxml2-python-2.5.10-8.x86_64.rpm

Red Hat Desktop version 3:

Source:
ftp://updates.redhat.com/enterprise/3desktop/en/os/SRPMS/libxml2-2.5.10-8.src.rpm

i386:
libxml2-2.5.10-8.i386.rpm
libxml2-debuginfo-2.5.10-8.i386.rpm
libxml2-devel-2.5.10-8.i386.rpm
libxml2-python-2.5.10-8.i386.rpm

x86_64:
libxml2-2.5.10-8.i386.rpm
libxml2-2.5.10-8.x86_64.rpm
libxml2-debuginfo-2.5.10-8.i386.rpm
libxml2-debuginfo-2.5.10-8.x86_64.rpm
libxml2-devel-2.5.10-8.x86_64.rpm
libxml2-python-2.5.10-8.x86_64.rpm

Red Hat Enterprise Linux ES version 3:

Source:
ftp://updates.redhat.com/enterprise/3ES/en/os/SRPMS/libxml2-2.5.10-8.src.rpm

i386:
libxml2-2.5.10-8.i386.rpm
libxml2-debuginfo-2.5.10-8.i386.rpm
libxml2-devel-2.5.10-8.i386.rpm
libxml2-python-2.5.10-8.i386.rpm

ia64:
libxml2-2.5.10-8.i386.rpm
libxml2-2.5.10-8.ia64.rpm
libxml2-debuginfo-2.5.10-8.i386.rpm
libxml2-debuginfo-2.5.10-8.ia64.rpm
libxml2-devel-2.5.10-8.ia64.rpm
libxml2-python-2.5.10-8.ia64.rpm

x86_64:
libxml2-2.5.10-8.i386.rpm
libxml2-2.5.10-8.x86_64.rpm
libxml2-debuginfo-2.5.10-8.i386.rpm
libxml2-debuginfo-2.5.10-8.x86_64.rpm
libxml2-devel-2.5.10-8.x86_64.rpm
libxml2-python-2.5.10-8.x86_64.rpm

Red Hat Enterprise Linux WS version 3:

Source:
ftp://updates.redhat.com/enterprise/3WS/en/os/SRPMS/libxml2-2.5.10-8.src.rpm

i386:
libxml2-2.5.10-8.i386.rpm
libxml2-debuginfo-2.5.10-8.i386.rpm
libxml2-devel-2.5.10-8.i386.rpm
libxml2-python-2.5.10-8.i386.rpm

ia64:
libxml2-2.5.10-8.i386.rpm
libxml2-2.5.10-8.ia64.rpm
libxml2-debuginfo-2.5.10-8.i386.rpm
libxml2-debuginfo-2.5.10-8.ia64.rpm
libxml2-devel-2.5.10-8.ia64.rpm
libxml2-python-2.5.10-8.ia64.rpm

x86_64:
libxml2-2.5.10-8.i386.rpm
libxml2-2.5.10-8.x86_64.rpm
libxml2-debuginfo-2.5.10-8.i386.rpm
libxml2-debuginfo-2.5.10-8.x86_64.rpm
libxml2-devel-2.5.10-8.x86_64.rpm
libxml2-python-2.5.10-8.x86_64.rpm

Red Hat Enterprise Linux AS version 4:

Source:
ftp://updates.redhat.com/enterprise/4AS/en/os/SRPMS/libxml2-2.6.16-10.1.src.rpm

i386:
libxml2-2.6.16-10.1.i386.rpm
libxml2-debuginfo-2.6.16-10.1.i386.rpm
libxml2-devel-2.6.16-10.1.i386.rpm
libxml2-python-2.6.16-10.1.i386.rpm

ia64:
libxml2-2.6.16-10.1.i386.rpm
libxml2-2.6.16-10.1.ia64.rpm
libxml2-debuginfo-2.6.16-10.1.i386.rpm
libxml2-debuginfo-2.6.16-10.1.ia64.rpm
libxml2-devel-2.6.16-10.1.ia64.rpm
libxml2-python-2.6.16-10.1.ia64.rpm

ppc:
libxml2-2.6.16-10.1.ppc.rpm
libxml2-2.6.16-10.1.ppc64.rpm
libxml2-debuginfo-2.6.16-10.1.ppc.rpm
libxml2-debuginfo-2.6.16-10.1.ppc64.rpm
libxml2-devel-2.6.16-10.1.ppc.rpm
libxml2-python-2.6.16-10.1.ppc.rpm

s390:
libxml2-2.6.16-10.1.s390.rpm
libxml2-debuginfo-2.6.16-10.1.s390.rpm
libxml2-devel-2.6.16-10.1.s390.rpm
libxml2-python-2.6.16-10.1.s390.rpm

s390x:
libxml2-2.6.16-10.1.s390.rpm
libxml2-2.6.16-10.1.s390x.rpm
libxml2-debuginfo-2.6.16-10.1.s390.rpm
libxml2-debuginfo-2.6.16-10.1.s390x.rpm
libxml2-devel-2.6.16-10.1.s390x.rpm
libxml2-python-2.6.16-10.1.s390x.rpm

x86_64:
libxml2-2.6.16-10.1.i386.rpm
libxml2-2.6.16-10.1.x86_64.rpm
libxml2-debuginfo-2.6.16-10.1.i386.rpm
libxml2-debuginfo-2.6.16-10.1.x86_64.rpm
libxml2-devel-2.6.16-10.1.x86_64.rpm
libxml2-python-2.6.16-10.1.x86_64.rpm

Red Hat Enterprise Linux Desktop version 4:

Source:
ftp://updates.redhat.com/enterprise/4Desktop/en/os/SRPMS/libxml2-2.6.16-10.1.src.rpm

i386:
libxml2-2.6.16-10.1.i386.rpm
libxml2-debuginfo-2.6.16-10.1.i386.rpm
libxml2-devel-2.6.16-10.1.i386.rpm
libxml2-python-2.6.16-10.1.i386.rpm

x86_64:
libxml2-2.6.16-10.1.i386.rpm
libxml2-2.6.16-10.1.x86_64.rpm
libxml2-debuginfo-2.6.16-10.1.i386.rpm
libxml2-debuginfo-2.6.16-10.1.x86_64.rpm
libxml2-devel-2.6.16-10.1.x86_64.rpm
libxml2-python-2.6.16-10.1.x86_64.rpm

Red Hat Enterprise Linux ES version 4:

Source:
ftp://updates.redhat.com/enterprise/4ES/en/os/SRPMS/libxml2-2.6.16-10.1.src.rpm

i386:
libxml2-2.6.16-10.1.i386.rpm
libxml2-debuginfo-2.6.16-10.1.i386.rpm
libxml2-devel-2.6.16-10.1.i386.rpm
libxml2-python-2.6.16-10.1.i386.rpm

ia64:
libxml2-2.6.16-10.1.i386.rpm
libxml2-2.6.16-10.1.ia64.rpm
libxml2-debuginfo-2.6.16-10.1.i386.rpm
libxml2-debuginfo-2.6.16-10.1.ia64.rpm
libxml2-devel-2.6.16-10.1.ia64.rpm
libxml2-python-2.6.16-10.1.ia64.rpm

x86_64:
libxml2-2.6.16-10.1.i386.rpm
libxml2-2.6.16-10.1.x86_64.rpm
libxml2-debuginfo-2.6.16-10.1.i386.rpm
libxml2-debuginfo-2.6.16-10.1.x86_64.rpm
libxml2-devel-2.6.16-10.1.x86_64.rpm
libxml2-python-2.6.16-10.1.x86_64.rpm

Red Hat Enterprise Linux WS version 4:

Source:
ftp://updates.redhat.com/enterprise/4WS/en/os/SRPMS/libxml2-2.6.16-10.1.src.rpm

i386:
libxml2-2.6.16-10.1.i386.rpm
libxml2-debuginfo-2.6.16-10.1.i386.rpm
libxml2-devel-2.6.16-10.1.i386.rpm
libxml2-python-2.6.16-10.1.i386.rpm

ia64:
libxml2-2.6.16-10.1.i386.rpm
libxml2-2.6.16-10.1.ia64.rpm
libxml2-debuginfo-2.6.16-10.1.i386.rpm
libxml2-debuginfo-2.6.16-10.1.ia64.rpm
libxml2-devel-2.6.16-10.1.ia64.rpm
libxml2-python-2.6.16-10.1.ia64.rpm

x86_64:
libxml2-2.6.16-10.1.i386.rpm
libxml2-2.6.16-10.1.x86_64.rpm
libxml2-debuginfo-2.6.16-10.1.i386.rpm
libxml2-debuginfo-2.6.16-10.1.x86_64.rpm
libxml2-devel-2.6.16-10.1.x86_64.rpm
libxml2-python-2.6.16-10.1.x86_64.rpm

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/libxml2-2.6.26-2.1.2.1.src.rpm

i386:
libxml2-2.6.26-2.1.2.1.i386.rpm
libxml2-debuginfo-2.6.26-2.1.2.1.i386.rpm
libxml2-python-2.6.26-2.1.2.1.i386.rpm

x86_64:
libxml2-2.6.26-2.1.2.1.i386.rpm
libxml2-2.6.26-2.1.2.1.x86_64.rpm
libxml2-debuginfo-2.6.26-2.1.2.1.i386.rpm
libxml2-debuginfo-2.6.26-2.1.2.1.x86_64.rpm
libxml2-python-2.6.26-2.1.2.1.x86_64.rpm

RHEL Desktop Workstation (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/libxml2-2.6.26-2.1.2.1.src.rpm

i386:
libxml2-debuginfo-2.6.26-2.1.2.1.i386.rpm
libxml2-devel-2.6.26-2.1.2.1.i386.rpm

x86_64:
libxml2-debuginfo-2.6.26-2.1.2.1.i386.rpm
libxml2-debuginfo-2.6.26-2.1.2.1.x86_64.rpm
libxml2-devel-2.6.26-2.1.2.1.i386.rpm
libxml2-devel-2.6.26-2.1.2.1.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/libxml2-2.6.26-2.1.2.1.src.rpm

i386:
libxml2-2.6.26-2.1.2.1.i386.rpm
libxml2-debuginfo-2.6.26-2.1.2.1.i386.rpm
libxml2-devel-2.6.26-2.1.2.1.i386.rpm
libxml2-python-2.6.26-2.1.2.1.i386.rpm

ia64:
libxml2-2.6.26-2.1.2.1.i386.rpm
libxml2-2.6.26-2.1.2.1.ia64.rpm
libxml2-debuginfo-2.6.26-2.1.2.1.i386.rpm
libxml2-debuginfo-2.6.26-2.1.2.1.ia64.rpm
libxml2-devel-2.6.26-2.1.2.1.ia64.rpm
libxml2-python-2.6.26-2.1.2.1.ia64.rpm

ppc:
libxml2-2.6.26-2.1.2.1.ppc.rpm
libxml2-2.6.26-2.1.2.1.ppc64.rpm
libxml2-debuginfo-2.6.26-2.1.2.1.ppc.rpm
libxml2-debuginfo-2.6.26-2.1.2.1.ppc64.rpm
libxml2-devel-2.6.26-2.1.2.1.ppc.rpm
libxml2-devel-2.6.26-2.1.2.1.ppc64.rpm
libxml2-python-2.6.26-2.1.2.1.ppc.rpm

s390x:
libxml2-2.6.26-2.1.2.1.s390.rpm
libxml2-2.6.26-2.1.2.1.s390x.rpm
libxml2-debuginfo-2.6.26-2.1.2.1.s390.rpm
libxml2-debuginfo-2.6.26-2.1.2.1.s390x.rpm
libxml2-devel-2.6.26-2.1.2.1.s390.rpm
libxml2-devel-2.6.26-2.1.2.1.s390x.rpm
libxml2-python-2.6.26-2.1.2.1.s390x.rpm

x86_64:
libxml2-2.6.26-2.1.2.1.i386.rpm
libxml2-2.6.26-2.1.2.1.x86_64.rpm
libxml2-debuginfo-2.6.26-2.1.2.1.i386.rpm
libxml2-debuginfo-2.6.26-2.1.2.1.x86_64.rpm
libxml2-devel-2.6.26-2.1.2.1.i386.rpm
libxml2-devel-2.6.26-2.1.2.1.x86_64.rpm
libxml2-python-2.6.26-2.1.2.1.x86_64.rpm

These packages are GPG signed by Red Hat for security.  Our key and 
details on how to verify the signature are available from
https://www.redhat.com/security/team/key/#package

7. References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-6284
http://www.redhat.com/security/updates/classification/#important

8. Contact:

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

Copyright 2008 Red Hat, Inc.
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