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Category:   Application (Generic)  >   Apache Subversion Vendors:   subversion.tigris.org
(Red Hat Issues Fix for Subversion) neon Format String Flaws Let Remote WebDAV Servers Execute Arbitrary Code on Connected Clients
SecurityTracker Alert ID:  1009809
SecurityTracker URL:  http://securitytracker.com/id/1009809
CVE Reference:   CVE-2004-0179   (Links to External Site)
Date:  Apr 15 2004
Impact:   Execution of arbitrary code via network, User access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   Some format string vulnerabilities were reported in neon. A remote WebDAV server can execute arbitrary on a connected neon client. Subversion uses the affected neon code and is vulnerable.

The vendor reported that there are format string flaws in the processing of XML/207 response messages. A remote user can create a WebDAV server and supply specially crafted data to a connected neon client to execute arbitrary code on the connected client.

The vendor credits greuff@void.at with reporting these flaws.

Impact:   A remote WebDAV server can execute arbitrary code on the connected target system with the privileges of the neon client process.
Solution:   Red Hat has released a fix.

Red Hat Linux 9:

SRPMS:
ftp://updates.redhat.com/9/en/os/SRPMS/subversion-0.27.0-2.src.rpm

i386:
ftp://updates.redhat.com/9/en/os/i386/subversion-0.27.0-2.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/subversion-devel-0.27.0-2.i386.rpm

The verification checksums are:

MD5 sum Package Name

690c5d22e0f2baaf19f554f3466981b9 9/en/os/SRPMS/subversion-0.27.0-2.src.rpm
2a20d39d786e5ca72617a0719266e01d 9/en/os/i386/subversion-0.27.0-2.i386.rpm
c811a52c5b714e5700afc394f48b4c52 9/en/os/i386/subversion-devel-0.27.0-2.i386.rpm

Vendor URL:  subversion.tigris.org/ (Links to External Site)
Cause:   Input validation error, State error
Underlying OS:  Linux (Red Hat Linux)
Underlying OS Comments:  9

Message History:   This archive entry is a follow-up to the message listed below.
Apr 15 2004 neon Format String Flaws Let Remote WebDAV Servers Execute Arbitrary Code on Connected Clients



 Source Message Contents

Subject:  [RHSA-2004:159-01] Updated Subversion packages fix security


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

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

Synopsis:          Updated Subversion packages fix security vulnerability in neon
Advisory ID:       RHSA-2004:159-01
Issue date:        2004-04-15
Updated on:        2004-04-15
Product:           Red Hat Linux
Keywords:          
Cross references:  
Obsoletes:         
CVE Names:         CAN-2004-0179
- ---------------------------------------------------------------------

1. Topic:

Updated Subversion packages that fix a vulnerability in neon, exploitable by
a malicious DAV server, are now available.

2. Relevant releases/architectures:

Red Hat Linux 9 - i386

3. Problem description:

Subversion is a concurrent version control system that uses inbuilt code
from neon, an HTTP and WebDAV client library.

Versions of the neon client library up to and including 0.24.4 have been
found to contain a number of format string bugs.  An attacker could create
a malicious WebDAV server in such a way as to allow arbitrary code
execution on the client should a user connect to it using subversion.  The
Common Vulnerabilities and Exposures project (cve.mitre.org) has assigned
the name CAN-2004-0179 to this issue.

This update includes a patch to correct this issue, and an upgrade to
Subversion 0.27.0, the last version which is compatible with the database
schema used by Subversion 0.17.0.  Users of Subversion are advised to
upgrade to these updated packages.

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/subversion-0.27.0-2.src.rpm

i386:
ftp://updates.redhat.com/9/en/os/i386/subversion-0.27.0-2.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/subversion-devel-0.27.0-2.i386.rpm



6. Verification:

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

690c5d22e0f2baaf19f554f3466981b9 9/en/os/SRPMS/subversion-0.27.0-2.src.rpm
2a20d39d786e5ca72617a0719266e01d 9/en/os/i386/subversion-0.27.0-2.i386.rpm
c811a52c5b714e5700afc394f48b4c52 9/en/os/i386/subversion-devel-0.27.0-2.i386.rpm

These packages are GPG signed by Red Hat for security.  Our key is
available from https://www.redhat.com/security/team/key.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://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2004-0179

8. Contact:

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

Copyright 2004 Red Hat, Inc.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.7 (GNU/Linux)

iD8DBQFAflSxXlSAg2UNWIIRAve1AKCWGdv5AgYB2qQDy0mQlJiBTyUB0ACgtfcd
bWursxJlWA9zCfIgSN2vKGo=
=PNjq
-----END PGP SIGNATURE-----


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