Citrix Access Gateway Plug-in for Windows ActiveX Control Multiple Vulnerabilities (CTX129902)

This script is Copyright (C) 2011-2013 Tenable Network Security, Inc.


Synopsis :

The remote Windows host has an ActiveX control that is affected by
multiple vulnerabilities.

Description :

The Citrix Access Gateway ActiveX control for Citrix Access Gateway
Enterprise Edition is installed on the remote Windows host. It is the
ActiveX component of the Citrix Access Gateway Plug-in for Windows and
provides an SSL-based VPN via a web browser.

The installed version of this control is affected by the following
vulnerabilities that could lead to arbitrary code execution :

- The control loads a dynamic link library (DLL) when
processing HTTP header data from the Access Gateway
server without properly ensuring that the DLL has a
valid signature. (ZDI 928)

- The control copies HTTP header data from the Access
Gateway server into a fixed-size stack buffer without
verifying the size of the data, which could result in
a buffer overflow. (ZDI 929)

See also :

http://www.nessus.org/u?9953dfa4
http://www.nessus.org/u?b0fe00ad
http://www.securityfocus.com/archive/1/518891/30/0/threaded
http://support.citrix.com/article/CTX129902

Solution :

Either set the kill bit for the control or upgrade to Citrix Access
Gateway Enterprise Edition 8.1-67.7 / 9.0-70.5 / 9.1-96.4 or later.

Risk factor :

High / CVSS Base Score : 9.3
(CVSS2#AV:N/AC:M/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 7.7
(CVSS2#E:F/RL:OF/RC:C)
Public Exploit Available : true

Family: Windows

Nessus Plugin ID: 55653 ()

Bugtraq ID: 48676

CVE ID: CVE-2011-2882
CVE-2011-2883

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