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TCPDump: Decoding routines Denial of Service vulnerability


1.  Gentoo Linux Security Advisory

Version Information

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


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

2.  Impact Information


TCPDump is a tool for network monitoring and data acquisition.


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.


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


There is no known workaround at this time.


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


Page updated May 09, 2005

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