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Category:   Application (Generic)  >   Libxml2 Vendors:   xmlsoft.org
(Red Hat Issues Fix for RH Linux) Libxml2 URL Parsing Buffer Overflow May Let Remote Users Execute Arbitrary Code
SecurityTracker Alert ID:  1009223
SecurityTracker URL:  http://securitytracker.com/id/1009223
CVE Reference:   CAN-2004-0110   (Links to External Site)
Updated:  Mar 3 2004
Original Entry Date:  Feb 26 2004
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): prior to 2.6.6
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.
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.
Solution:   [Editor's note: Red Hat has since replaced this fix with a new fix, as described in their update advisory RHSA-2004:091-02 and in our Alert ID 1009311. Do not use the fix below, as the vendor reports that it is incomplete. See the Message History for the revised fix.]

Red Hat has released a fix.

Red Hat Linux 9:

SRPMS:
ftp://updates.redhat.com/9/en/os/SRPMS/libxml2-2.5.4-2.src.rpm

i386:
ftp://updates.redhat.com/9/en/os/i386/libxml2-2.5.4-2.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/libxml2-devel-2.5.4-2.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/libxml2-python-2.5.4-2.i386.rpm

The verification checksums are:

MD5 sum Package Name

7a1834ebc511ce8752dab9265ed0e3dd 9/en/os/SRPMS/libxml2-2.5.4-2.src.rpm
f9663aacd4980f9e2805f90ea6f8fd93 9/en/os/i386/libxml2-2.5.4-2.i386.rpm
ef2c2b5b8644ac165529a45d34029d3d 9/en/os/i386/libxml2-devel-2.5.4-2.i386.rpm
1c269ed922321b3cce101408767de3ad 9/en/os/i386/libxml2-python-2.5.4-2.i386.rpm
Vendor URL:  www.xmlsoft.org/index.html (Links to External Site)
Cause:   Boundary error
Underlying OS:   Linux (Red Hat Linux)

Message History:   This archive entry is a follow-up to the message listed below.
Feb 26 2004 Libxml2 URL Parsing Buffer Overflow May Let Remote Users Execute Arbitrary Code


 Source Message Contents
Date:  Thu, 26 Feb 2004 02:45 -0500
Subject:  [RHSA-2004:091-01] Updated libxml2 packages fix security vulnerability


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

- ---------------------------------------------------------------------
                   Red Hat Security Advisory

Synopsis:          Updated libxml2 packages fix security vulnerability
Advisory ID:       RHSA-2004:091-01
Issue date:        2004-02-26
Updated on:        2004-02-26
Product:           Red Hat Linux
Keywords:          
Cross references:  
Obsoletes:         
CVE Names:         CAN-2004-0110
- ---------------------------------------------------------------------

1. Topic:

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

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/libxml2-2.5.4-2.src.rpm

i386:
ftp://updates.redhat.com/9/en/os/i386/libxml2-2.5.4-2.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/libxml2-devel-2.5.4-2.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/libxml2-python-2.5.4-2.i386.rpm



6. Verification:

MD5 sum                          Package Name
- --------------------------------------------------------------------------

7a1834ebc511ce8752dab9265ed0e3dd 9/en/os/SRPMS/libxml2-2.5.4-2.src.rpm
f9663aacd4980f9e2805f90ea6f8fd93 9/en/os/i386/libxml2-2.5.4-2.i386.rpm
ef2c2b5b8644ac165529a45d34029d3d 9/en/os/i386/libxml2-devel-2.5.4-2.i386.rpm
1c269ed922321b3cce101408767de3ad 9/en/os/i386/libxml2-python-2.5.4-2.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@redhat.com>.  More contact
details at https://www.redhat.com/solutions/security/news/contact.html

Copyright 2003 Red Hat, Inc.
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Version: GnuPG v1.0.7 (GNU/Linux)

iD8DBQFAPaQjXlSAg2UNWIIRAjgBAKCrCcz2z1BBVAz3nvu8uZrT4unYuwCgp8JK
fcRHkPyCU8AOvEbvrjmlp8w=
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-----END PGP SIGNATURE-----


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