Some vulnerabilities have been discovered in NovaNET, which can be exploited by malicious people to disclose potentially sensitive information, cause a DoS (Denial of Service), and compromise a vulnerable system.

1) A boundary error exists within the "DtbClsLogin()" function in nnwindtb.dll (Windows) or libnnlindtb.so (Linux), which can be exploited to cause a stack-based buffer overflow by sending specially crafted requests to the application.

Successful exploitation allows to e.g. crash the application on a Windows system and reportedly allows to execute arbitrary code on a Linux system.

2) An error exists within the processing of certain packets, which can be exploited to dump arbitrary memory by sending specially crafted packets to the service.

Note: This may allow to bypass the stack canary protection on Windows systems.

The vulnerabilities are confirmed in NovaNET version 12 (build 44717, Evaluation) for Windows. Other versions may also be affected.

Solution
Restrict network access to the application. Reportedly fixed in version 13.

Provided and/or discovered by
1) AbdulAziz Hariri of Insight Technologies.
2) mu-b

Changelog
Further details available in Customer Area

Original Advisory
mu-b:
http://archives.neohapsis.com/archives/fulldisclosure/2010-04/0355.html

Deep Links
Links available in Customer Area