Advisory Details

September 29th, 2010

IBM TSM FastBack _CalcHashValueWithLength Remote Denial of Service Vulnerability

ZDI-10-186
ZDI-CAN-659

CVE ID
CVSS SCORE 5, (AV:N/AC:L/Au:N/C:N/I:N/A:P)
AFFECTED VENDORS IBM
AFFECTED PRODUCTS Tivoli Storage Manager FastBack
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:

http://www.ibm.com/support/docview.wss?uid=swg21443820
Issue 3


DISCLOSURE TIMELINE
  • 2010-01-22 - Vulnerability reported to vendor
  • 2010-09-29 - Coordinated public release of advisory
CREDIT Sebastian Apelt (www.siberas.de)
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