Red Hat Linux Advisory: tcpdump

Red Hat Security Advisory

1. Topic:

Updated tcpdump, libpcap, and arpwatch packages fix a number of vulnerabilities in ISAKMP parsing.

2. Relevant releases/architectures:

Red Hat Linux 9 - i386

3. Problem description:

Tcpdump is a command-line tool for monitoring network traffic.

George Bakos discovered flaws in the ISAKMP decoding routines of tcpdump versions prior to 3.8.1. The Common Vulnerabilities and Exposures project (cve.mitre.org/) has assigned the name CAN-2003-0989 to this issue.

Jonathan Heusser discovered two additional flaws in the ISAKMP decoding routines of tcpdump versions up to and including 3.8.1.

Remote attackers could potentially exploit these issues by sending carefully-crafted packets to a victim. If the victim uses tcpdump, these pakets could result in a denial of service, or possibly execute arbitrary code as the 'pcap' user.

Users of tcpdump are advised to upgrade to these erratum packages, which contain backported security patches and are not vulnerable to these issues.

4. Solution:

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

Please note that this update is available via Red Hat Network. 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.

5. RPMs required:

Red Hat Linux 9:

SRPMS:
ftp://updates.redhat.com/9/en/os/SRPMS/tcpdump-3.7.2-7.9.1.src.rpm

i386:
ftp://updates.redhat.com/9/en/os/i386/arpwatch-2.1a11-7.9.1.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/libpcap-0.7.2-7.9.1.i386.rpm
ftp://updates.redhat.com/9/en/os/i386/tcpdump-3.7.2-7.9.1.i386.rpm

6. Verification:

MD5 sum Package Name

226b13743f96ea03b3c3a17e74114b1b 9/en/os/SRPMS/tcpdump-3.7.2-7.9.1.src.rpm
fe3af157c00676c7021f793a5afd1f62 9/en/os/i386/arpwatch-2.1a11-7.9.1.i386.rpm
384fee9a20392740cf83cced8eb41a3c 9/en/os/i386/libpcap-0.7.2-7.9.1.i386.rpm
c5eb264f2f18ddffd07e700d752c63ba 9/en/os/i386/tcpdump-3.7.2-7.9.1.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://marc.theaimsgroup.com/?l=tcpdump-workrs&m=107325073018070
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CAN-2003-0989

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.