TCPDump: Decoding routines Denial of Service vulnerability

1. Gentoo Linux Security Advisory

Advisory Reference	GLSA 200505-06 / tcpdump
Release Date	May 09, 2005
Latest Revision	June 12, 2005: 02
Impact	normal
Exploitable	remote

Package	Vulnerable versions	Unaffected versions	Architecture(s)
net-analyzer/tcpdump	< 3.8.3-r3	>= 3.8.3-r3	All supported architectures

Related bugreports: #90541, #95349

Synopsis

A flaw in the decoding of network packets renders TCPDump vulnerable to a remote Denial of Service attack.

2. Impact Information

Background

TCPDump is a tool for network monitoring and data acquisition.

Description

TCPDump improperly handles and decodes ISIS (CAN-2005-1278), BGP (CAN-2005-1267, CAN-2005-1279), LDP (CAN-2005-1279) and RSVP (CAN-2005-1280) packets. TCPDump might loop endlessly after receiving malformed packets.

Impact

A malicious remote attacker can exploit the decoding issues for a Denial of Service attack by sending specially crafted packets, possibly causing TCPDump to loop endlessly.

3. Resolution Information

Workaround

There is no known workaround at this time.

Resolution

All TCPDump users should upgrade to the latest available version:

Code Listing 3.1: Resolution

# emerge --sync
# emerge --ask --oneshot --verbose ">=net-analyzer/tcpdump-3.8.3-r3"

4. References

Updated May 09, 2005

Summary: This is a Gentoo Linux Security Advisory

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