TippingPoint Zero Day Initiative

IBM TSM FastBack _CalcHashValueWithLength Remote Denial of Service Vulnerability

ZDI-10-186: September 29th, 2010

CVSS Score

Affected Vendors

Affected Products

Vulnerability Details

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.

Vendor Response

IBM states:

Issue 3

Disclosure Timeline

    2010-01-22 - Vulnerability reported to vendor
    2010-09-29 - Coordinated public release of advisory


This vulnerability was discovered by:
    Sebastian Apelt (www.siberas.de)