Secunia Research: SigPlus Pro ActiveX Control Buffer Overflow Vulnerabilities

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                     Secunia Research 03/02/2011

    - SigPlus Pro ActiveX Control Buffer Overflow Vulnerabilities -

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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 multiple vulnerabilities in SigPlus
Pro ActiveX control, which can be exploited by malicious people to
compromise a user's system.

1) A boundary error when processing the "KeyString" property can be
exploited to cause a heap-based buffer overflow via an overly long
string.

2) A boundary error when handling the "SetLocalIniFilePath()" method
can be exploited to cause a heap-based buffer overflow via an overly
long string passed as the "NewPath" parameter.

3) A boundary error when handling the "SetTabletPortPath()" method
can be exploited to cause a heap-based buffer overflow via an overly
long string passed as the "NewPortPath" parameter.

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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-2011-0324 for the vulnerabilities.

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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/2011-2/

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

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