Insecure DLL Validation in Citrix Access Gateway Enterprise Edition

CVE-2011-2883 · HIGH Severity

AV:N/AC:M/AU:N/C:C/I:C/A:C

The NSEPA.NsepaCtrl.1 ActiveX control in nsepa.ocx in Citrix Access Gateway Enterprise Edition 8.1 before 8.1-67.7, 9.0 before 9.0-70.5, and 9.1 before 9.1-96.4 attempts to validate signed DLLs by checking the certificate subject, not the signature, which allows man-in-the-middle attackers to execute arbitrary code via HTTP header data referencing a DLL that was signed with a crafted certificate.

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