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 an integer overflow 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 a specially crafted "Content-Length" HTTP response header. Successful exploitation may allow execution of arbitrary code. Citrix Access Gateway Plug-in for Windows version 9.3.49.5 is affected.
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