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tcpdump -- infinite loops in protocol decoding


Problem Description

Several tcpdump protocol decoders contain programming errors which can cause them to go into infinite loops.


An attacker can inject specially crafted packets into the network which, when processed by tcpdump, could lead to a denial-of-service. After the attack, tcpdump would no longer capture traffic, and would potentially use all available processor time.



portaudit: tcpdump -- infinite loops in protocol decoding

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If you have found a vulnerability in a FreeBSD port not listed in the database, please contact the FreeBSD Security Officer. Refer to "FreeBSD Security Information" for more information.

Oliver Eikemeier <>