RHSA-2003:033 - Security Advisory

Topic

Updated tcpdump, libpcap, and arpwatch packages are available to fix an
incorrect bounds check when decoding BGP packets and a possible denial of
service.

Description

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

The BGP decoding routines in tcpdump before version 3.6.2 used incorrect
bounds checking when copying data, which allows remote attackers to cause a
denial of service and possibly execute arbitrary code (as the 'pcap' user).

If a UDP packet from a radius port contains 0 at the second byte tcpdump
gets stuck in a loop that generating an infinite stream of "#0#0#0#0#0".
This could be used as a denial of service.

Users of tcpdump are advised to upgrade to these errata packages which
contain patches to correct thes issues.

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.

Affected Products

• Red Hat Enterprise Linux Server 2 ia64
• Red Hat Enterprise Linux Workstation 2 ia64

Fixes

• BZ - 81585 - tcpdump can crash a machine when it sees certain udp packets
• BZ - 82995 - tcpdump problem with bgp decoding

CVEs

• CVE-2003-0093
• CVE-2002-1350

References

(none)