Secunia Research has discovered two vulnerabilities in Citrix Access Gateway Plug-in for Windows, which can be exploited by malicious people to compromise a user's system.
1) A boundary error in the nsepacom ActiveX control (nsepa.exe) when processing HTTP responses based on the request via the "StartEpa()" method can be exploited to cause a heap-based buffer overflow via an overly long "CSEC" HTTP response header.
2) An integer overflow error in the nsepacom ActiveX control (nsepa.exe) when processing HTTP responses based on the request via the "StartEpa()" method can be exploited to cause a heap-based buffer overflow via a specially crafted "Content-Length" HTTP response header.
Successful exploitation of the vulnerabilities allows execution of arbitrary code.
The vulnerabilities are confirmed in version 126.96.36.199 and reportedly affect the following versions:
* 10.0 prior to 10.0-69.4
* 9.3 prior to 9.3-57.5
* 9.2 (all versions)
* 9.1 (all versions)
* 9.0 (all versions)
Solution: Update to version 10.0-69.4 or 9.3-57.5.
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Subject: Citrix Access Gateway Plug-in for Windows nsepacom ActiveX Control Vulnerabilities
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