TCPDump: Decoding routines Denial of Service vulnerability

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.

Workaround

There is no known workaround at this time.

Resolution

All TCPDump users should upgrade to the latest available version:

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