A security flaw was found in the Wireshark's SMTP dissector -- routines for SMTP packet disassembly. A remote attacker could use this flaw to cause a denial of service (infinite loop) via sending a large SMTP request to port 25. References: http://packetstormsecurity.org/0811-advisories/wireshark104-dos.txt http://www.securityfocus.com/archive/1/498562/30/0/threaded http://www.nabble.com/-SVRT-04-08--Vulnerability-in-WireShark-1.0.4-for-DoS-Attack-td20640164.html Proposed upstream patches: http://anonsvn.wireshark.org/viewvc/trunk/epan/dissectors/packet-smtp.c?r1=24989&r2=24988&pathrev=24989&view=patch http://anonsvn.wireshark.org/viewvc/trunk/epan/dissectors/packet-smtp.c?r1=24994&r2=24993&pathrev=24994&view=patch
The Red Hat Security Response Team has rated this issue as having low security impact, a future update may address this flaw. More information regarding issue severity can be found here: http://www.redhat.com/security/updates/classification/
This issue was addressed in: Red Hat Enterprise Linux: http://rhn.redhat.com/errata/RHSA-2009-0313.html