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IBM TSM FastBack _CalcHashValueWithLength Remote Denial of Service Vulnerability

Reference ID: SSA-1016
Publication date: 29.09.2010
Severity: medium
Discovered by: Sebastian Apelt

Affected versions: - and -

Description from ZDI advisory: This vulnerability allows remote attackers to create a denial of service condition on vulnerable installations of IBM Tivoli FastBack Server. Authentication is not required to exploit this vulnerability. The specific flaw exists within FastBackServer.exe which listens by default on tcp port 11406. The issue is due to an unchecked user supplied length value. This value is used to iterate over supplied data and calculate a CRC value. Successful exploitation leads to an unhandled access violation and immediate termination of the FastBackServer.exe process.

Patch on IBM homepage