Secunia Research: Symantec Products wkssr.dll Integer Underflow Vulnerability

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                     Secunia Research 28/07/2010

   - Symantec Products wkssr.dll Integer Underflow Vulnerability -

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Table of Contents

Affected Software....................................................1
Severity.............................................................2
Description of Vulnerability.........................................3
Solution.............................................................4
Time Table...........................................................5
Credits..............................................................6
References...........................................................7
About Secunia........................................................8
Verification.........................................................9

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1) Affected Software 

* Symantec Mail Security for Microsoft Exchange
* Symantec Mail Security for Domino

NOTE: Other versions may also be affected.

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2) Severity 

Rating: Moderately critical
Impact: Denial of Service
        System compromise
Where:  Remote

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4) Description of Vulnerability

Secunia Research has discovered a vulnerability in various Symantec
products, which can be exploited by malicious people to cause a DoS 
(Denial of Service) and potentially compromise a vulnerable system.

The vulnerability is caused by an integer underflow error in the 
SpreadSheet Lotus 123 reader (wkssr.dll) when parsing the size of a 
specific record type. This can be exploited to cause a heap-based 
buffer overflow via a specially crafted file.

Successful exploitation may allow execution of arbitrary code.

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5) Solution 

Update to a fixed version.

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6) Time Table 

22/03/2010 - Vendor notified.
22/03/2010 - Vendor response.
16/04/2010 - Status update requested.
16/04/2010 - Vendor provides status update.
24/05/2010 - Status update requested.
24/05/2010 - Vendor provides status update.
16/06/2010 - Status update requested.
23/06/2010 - Vendor provides status update.
08/07/2010 - Status update requested.
08/07/2010 - Vendor provides status update.
28/07/2010 - Public disclosure.

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7) Credits 

Discovered by Carsten Eiram, Secunia Research.

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8) References

The Common Vulnerabilities and Exposures (CVE) project has assigned 
CVE-2010-1525 for the vulnerability.

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9) About Secunia

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10) Verification 

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2010-100/

Complete list of vulnerability reports published by Secunia Research:
http://secunia.com/secunia_research/

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