Secunia Research: IBM Lotus Notes wkssr.dll Integer Underflow Vulnerability

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                     Secunia Research 28/07/2010

   - IBM Lotus Notes wkssr.dll Integer Underflow Vulnerability -

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Table of Contents

Affected Software....................................................1
Severity.............................................................2
Vendor's Description of Software.....................................3
Description of Vulnerability.........................................4
Solution.............................................................5
Time Table...........................................................6
Credits..............................................................7
References...........................................................8
About Secunia........................................................9
Verification........................................................10

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1) Affected Software 

* Lotus Notes 8.5

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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3) Vendor's Description of Software 

"Easy to use, integrated desktop client that brings you the people, 
business applications, and information you need from across the 
enterprise and the Internet to help you get your work done fast.".

Product Link:
http://ibm.com/software/lotus/products/notes/

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4) Description of Vulnerability

Secunia Research has discovered a vulnerability in Lotus Notes, which
can be exploited by malicious people to potentially compromise a 
user's 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 

Apply available patch or Fix Pack.

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6) Time Table 

22/03/2010 - Vendor notified.
16/04/2010 - Status update requested.
18/04/2010 - Vendor provides status update.
24/05/2010 - Status update requested.
14/06/2010 - Vendor asks about coordinated disclosure date.
15/06/2010 - Vendor provided with expected disclosure date.
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/2010-98/

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

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