full-disclosure - ZDI-10-186: IBM TSM FastBack _CalcHashValueWithLength Remote Denial of Service Vulnerability

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Date: Wed, 29 Sep 2010 18:26:54 -0500
From: ZDI Disclosures <zdi-disclosures@...pingpoint.com>
To: "Full Disclosure (full-disclosure@...ts.grok.org.uk)"
	<full-disclosure@...ts.grok.org.uk>, "Bugtraq (bugtraq@...urityfocus.com)"
	<bugtraq@...urityfocus.com>
Subject: ZDI-10-186: IBM TSM FastBack
 _CalcHashValueWithLength Remote Denial of Service Vulnerability

ZDI-10-186: IBM TSM FastBack _CalcHashValueWithLength Remote Denial of Service Vulnerability
http://www.zerodayinitiative.com/advisories/ZDI-10-186
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:
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:
This vulnerability was discovered by:
    * Sebastian Apelt (www.siberas.de)

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