Secunia Research has discovered a vulnerability in Citrix Access Gateway Plug-in for Windows, which can be exploited by malicious people to compromise a user's system. The vulnerability is caused by a boundary error in the nsepacom ActiveX control (nsepa.exe) when processing HTTP responses based on the request via the "StartEpa()" method. This can be exploited to cause a heap-based buffer overflow via an overly long "CSEC" HTTP response header. Successful exploitation allows execution of arbitrary code. Citrix Access Gateway Plug-in for Windows version 9.3.49.5 is affected.
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