A security flaw was found in the way NTLMSSP dissector of Wireshark, a network traffic analyzer, performed dissection of certain NTLMSSP packet capture files. A remote attacker could provide a specially-crafted NTLMSSP packet / packet capture that, when processed, would lead to tshark executable crash or, potentially, arbitrary code execution with the privileges of the user running the binary.

References:
[1] http://www.wireshark.org/security/wnpa-sec-2013-09.html
[2] http://www.openwall.com/lists/oss-security/2013/01/31/2