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 processing the "SetLocalIniFilePath()" method can be exploited to cause a heap-based buffer overflow via an overly long string passed in the "NewPath" parameter.

3) An error due to an unsafe "SetLogFilePath()" method creating a log file in a specified location can be exploited in combination with e.g. the "SigMessage()" method to create an arbitrary file with controlled content.

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

Successful exploitation of these vulnerabilities allows execution of arbitrary code.

The vulnerabilities are confirmed in version 3.95. Other versions may also be affected.

Solution
Upgrade to version 4.29.

Provided and/or discovered by
Dmitriy Pletnev, Secunia Research.

Original Advisory
Secunia Research:
http://secunia.com/secunia_research/2011-1/
http://secunia.com/secunia_research/2011-2/

Technical Analysis
Further details available to Secunia VIM customers

Alternate/detailed remediation
Further details available in Customer Area

Deep Links
Links available to Secunia VIM customers