Citrix XenApp Online Plug-in / Receiver Crafted Certificate MitM Spoofing Weakness
Medium Nessus Plugin ID 42961
SynopsisA client application installed on the remote Windows host is affected by a man-in-the-middle vulnerability.
DescriptionThe version of Citrix Online Plug-in or ICA Client installed on the remote Windows host is affected by an unspecified man-in-the-middle (MitM) vulnerability. This issue is related to Microsoft security bulletin MS09-056 and is likely due to a failure to detect null bytes in the common name of a server certificate. A remote attacker can exploit this issue to perform a man-in-the-middle attack, allowing the attacker to read or modify SSL/TLS traffic being sent to and from the host.
This plugin only checks the ICA Client running on Windows, though other platforms are affected.
SolutionUpgrade to Citrix Online Plug-in or Citrix ICA Client version 11.0.150 / 11.2.0 or later.