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Category:   Application (Generic)  >   Tcpdump Vendors:   Tcpdump.org
(Red Hat Issues Fix) Tcpdump Can Be Crashed By a Remote User Sending a Malicious ISAKMP Packet
SecurityTracker Alert ID:  1008736
SecurityTracker URL:  http://securitytracker.com/id/1008736
CVE Reference:   CVE-2003-0989, CVE-2004-0057   (Links to External Site)
Date:  Jan 16 2004
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 3.8.1 and prior versions
Description:   Several vulnerabilities were reported in tcpdump in the processing of ISAKMP packets. A remote user can cause tcmpdump to crash or to enter an infinite loop.

It is reported that the rawprint() function in print-isakmp.c fails to validate its input arguments [CVE: CVE-2004-0057]. A remote user can send a specially crafted ISAKMP packet to cause the tcpdump process to crash. Red Hat credits Jonathan Heusser with discovering this flaw. Version 3.8.1 and prior versions are affected.

It is also reported that versions prior to 3.8.1 contain flaws that allow a remote user to force tcpdump to enter an infinite loop [CVE: CVE-2003-0989]. According to Red Hat, George Bakos discovered these flaws.

Impact:   A remote user can cause the tcpdump process to crash or to enter an endless loop.
Solution:   Red Hat has released a fix.

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

The verification checksums are:

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

Vendor URL:  cvs.tcpdump.org/cgi-bin/cvsweb/tcpdump/print-isakmp.c (Links to External Site)
Cause:   Boundary error, Input validation error, State error
Underlying OS:  Linux (Red Hat Linux)

Message History:   This archive entry is a follow-up to the message listed below.
Jan 14 2004 Tcpdump Can Be Crashed By a Remote User Sending a Malicious ISAKMP Packet



 Source Message Contents

Subject:  [RHSA-2004:007-01] Updated tcpdump packages fix various vulnerabilities


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

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

Synopsis:          Updated tcpdump packages fix various vulnerabilities
Advisory ID:       RHSA-2004:007-01
Issue date:        2004-01-07
Updated on:        2004-01-14
Product:           Red Hat Linux
Keywords:          tcpdump arpwatch buffer overflow
Cross references:  
Obsoletes:         RHSA-2003:174
CVE Names:         CAN-2003-0989
- ---------------------------------------------------------------------

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.
-----BEGIN PGP SIGNATURE-----
Version: GnuPG v1.0.7 (GNU/Linux)

iD8DBQFABZwQXlSAg2UNWIIRAjnsAJ0UG/Jiuzyc08qt0+6lzVDjOwi6FgCgxGCY
6eZ3bJHHmPo2pqyoQvZ80f0=
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-----END PGP SIGNATURE-----


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