IBM TSM FastBack _CalcHashValueWithLength Remote Denial of Service Vulnerability

Credit: ZDI
Risk: Medium
Local: No
Remote: Yes

CVSS Base Score: 5/10
Impact Subscore: 2.9/10
Exploitability Subscore: 10/10
Exploit range: Remote
Attack complexity: Low
Authentication: No required
Confidentiality impact: None
Integrity impact: None
Availability impact: Partial

ZDI-10-186: IBM TSM FastBack _CalcHashValueWithLength Remote Denial of Service Vulnerability September 29, 2010 -- CVSS: 5, (AV:N/AC:L/Au:N/C:N/I:N/A:P) -- Affected Vendors: IBM -- Affected Products: IBM 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: Issue 3 -- Disclosure Timeline: 2010-01-22 - Vulnerability reported to vendor 2010-09-29 - Coordinated public release of advisory -- Credit: This vulnerability was discovered by: * Sebastian Apelt ( -- About the Zero Day Initiative (ZDI): Established by TippingPoint, The Zero Day Initiative (ZDI) represents a best-of-breed model for rewarding security researchers for responsibly disclosing discovered vulnerabilities. Researchers interested in getting paid for their security research through the ZDI can find more information and sign-up at: The ZDI is unique in how the acquired vulnerability information is used. TippingPoint does not re-sell the vulnerability details or any exploit code. Instead, upon notifying the affected product vendor, TippingPoint provides its customers with zero day protection through its intrusion prevention technology. Explicit details regarding the specifics of the vulnerability are not exposed to any parties until an official vendor patch is publicly available. Furthermore, with the altruistic aim of helping to secure a broader user base, TippingPoint provides this vulnerability information confidentially to security vendors (including competitors) who have a vulnerability protection or mitigation product. Our vulnerability disclosure policy is available online at: Follow the ZDI on Twitter:


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