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Date: Thu, 13 Nov 2003 03:35 -0500
From: <>
To: <>, <>,
Subject: [RHSA-2003:307-01] Updated zebra packages fix security vulnerabilities

Hash: SHA1

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

Synopsis:          Updated zebra packages fix security vulnerabilities
Advisory ID:       RHSA-2003:307-01
Issue date:        2003-11-13
Updated on:        2003-11-13
Product:           Red Hat Linux
Keywords:          DoS
Cross references:  
CVE Names:         CAN-2003-0795 CAN-2003-0858
- ---------------------------------------------------------------------

1. Topic:

Updated zebra packages that close a locally-exploitable and a
remotely-exploitable denial of service vulnerability are now available.

2. Relevant releases/architectures:

Red Hat Linux 7.2 - i386, ia64
Red Hat Linux 7.3 - i386
Red Hat Linux 8.0 - i386
Red Hat Linux 9 - i386

3. Problem description:

Zebra an open source implementation of TCP/IP routing software.

Jonny Robertson reported that Zebra can be remotely crashed if a Zebra
password has been enabled and a remote attacker can connect to the Zebra
telnet management port.  The Common Vulnerabilities and Exposures project
( has assigned the name CAN-2003-0795 to this issue.

Herbert Xu reported that Zebra can accept spoofed messages sent on the
kernel netlink interface by other users on the local machine.  This could
lead to a local denial of service attack.  The Common Vulnerabilities and
Exposures project ( has assigned the name CAN-2003-0858 to
this issue.

Users of Zebra should upgrade to these erratum packages, which contain
a patch preventing Zebra from crashing when it receives a telnet option
delimiter without any option data, and a patch that checks that netlink
messages actually came from the kernel.

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:


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:

5. Bug IDs fixed ( for more info):

107140 - CAN-2003-0795 Remote DoS in zebra

6. RPMs required:

Red Hat Linux 7.2:




Red Hat Linux 7.3:



Red Hat Linux 8.0:



Red Hat Linux 9:



7. Verification:

MD5 sum                          Package Name
- --------------------------------------------------------------------------
1c42972cd3666c8d5c36fe2d4636bbbe 7.2/en/os/SRPMS/zebra-0.91a-8.7.2.src.rpm
f3c2cd447407735bfa0a6ee3ea107f9c 7.2/en/os/i386/zebra-0.91a-8.7.2.i386.rpm
2caa6379b78578f62c0267ae703dc552 7.2/en/os/ia64/zebra-0.91a-8.7.2.ia64.rpm
de79d8ae225cad78b897338307c74f70 7.3/en/os/SRPMS/zebra-0.92a-5.7.3.src.rpm
09d89f6a6d9ccb46bba080c6d7bc8b93 7.3/en/os/i386/zebra-0.92a-5.7.3.i386.rpm
4b4a738f98718f4e49c1ad16dfc8c515 8.0/en/os/SRPMS/zebra-0.93a-5.8.0.src.rpm
1665646ebda30a90ff04a06697b7df5f 8.0/en/os/i386/zebra-0.93a-5.8.0.i386.rpm
1d1e42921d7e83d7208a4c92aa9523e1 9/en/os/SRPMS/zebra-0.93b-4.9.src.rpm
73fad11a6b94e96ab66325c5bdac16cd 9/en/os/i386/zebra-0.93b-4.9.i386.rpm

These packages are GPG signed by Red Hat for security.  Our key is
available from

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>

8. References:

9. Contact:

The Red Hat security contact is <>.  More contact
details at

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


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