epan/tvbuff.c in Wireshark 1.6.x before 1.6.13 and 1.8.x before 1.8.5 does not properly validate certain length values for the MS-MMC dissector, which allows remote attackers to cause a denial of service (application crash) via a malformed packet.
The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.