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ZDI-10-187: IBM TSM FastBack Server _DAS_ReadBlockReply Remote Denial of Service Vulnerability

ZDI-10-187: IBM TSM FastBack Server _DAS_ReadBlockReply Remote Denial of Service Vulnerability
September 29, 2010

-- Affected Vendors:

-- Affected Products:
IBM Tivoli Storage Manager FastBack

-- TippingPoint(TM) IPS Customer Protection:
TippingPoint IPS customers have been protected against this
vulnerability by Digital Vaccine protection filter ID 9649. 
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-- 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 process which listens
by default on TCP port 11406. The problematic code resides within a
function responsible for reading a block of network packet data. A
parameter to this function is initialized to 0 and under certain
conditions this value will be accessed before properly initialized. This
causes a NULL pointer to be dereferenced and subsequent application
crash due to a lack of exception handling. Successful exploitation leads
to immediate termination of the fastback server.

-- Vendor Response:
IBM states:
Issue 3

-- Disclosure Timeline:
2010-02-02 - Vulnerability reported to vendor
2010-09-29 - Coordinated public release of advisory

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

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