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Secunia Research: SigPlus Pro ActiveX Control "SetLogFilePath()" Unsafe Method

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                     Secunia Research 03/02/2011

   - SigPlus Pro ActiveX Control "SetLogFilePath()" Unsafe Method -

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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 

* SigPlus Pro ActiveX Control 3.95

NOTE: Other versions may also be affected.

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2) Severity 

Rating: Highly critical
Impact: System access
Where:  Remote

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3) Vendor's Description of Software 

"SigPlus Pro ActiveX electronic signature software provides
everything you need to create applications using ActiveX or view
electronically signed documents."

Product Link:
http://www.topazsystems.com/Software/download/sigplusactivex.htm

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4) Description of Vulnerability

Secunia Research has discovered a vulnerability in SigPlus Pro ActiveX
control, which can be exploited by malicious people to compromise a 
user's system.

The vulnerability is caused due to an unsafe "SetLogFilePath()" 
method creating a log file in a specified location. This can be 
exploited in combination with e.g. the "SigMessage()" method to create
an arbitrary file with controlled content.

Successful exploitation allows execution of arbitrary code.

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5) Solution 

Upgrade to version 4.29.

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6) Time Table 

07/01/2011 - Request for security contact.
11/01/2011 - Vendor response.
11/01/2011 - Vendor notified.
25/01/2011 - Request for status update.
01/02/2011 - Request for status update.
02/02/2011 - Vendor releases fixed version.
03/02/2011 - Public disclosure.

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7) Credits 

Discovered by Dmitriy Pletnev, Secunia Research.

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8) References

The Common Vulnerabilities and Exposures (CVE) project has assigned 
CVE-2011-0323 for the vulnerability.

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9) About Secunia

Secunia offers vulnerability management solutions to corporate
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Secunia regularly hires new skilled team members. Check the URL below
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Secunia offers a FREE mailing list called Secunia Security Advisories:

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10) Verification 

Please verify this advisory by visiting the Secunia website:
http://secunia.com/secunia_research/2011-1/

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

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