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Vulnerability of Citrix XenDesktop: policy bypass after an upgrade

Synthesis of the vulnerability 

When the Citrix XenDesktop product was upgraded from version 5.x to 7.0, an attacker can bypass the security policy previously defined by the administrator.
Vulnerable software: XenDesktop.
Severity of this announce: 2/4.
Creation date: 23/10/2013.
Références of this computer vulnerability: BID-63413, CERTA-2013-AVI-598, CTX138627, CVE-2013-6077, VIGILANCE-VUL-13633.

Description of the vulnerability 

The Citrix XenDesktop product uses security policy rules, which have permissions.

However, after an upgrade from version 5.x to 7.0, permissions are not correctly updated.

When the Citrix XenDesktop product was upgraded from version 5.x to 7.0, an attacker can therefore bypass the security policy previously defined by the administrator.
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This cybersecurity bulletin impacts software or systems such as XenDesktop.

Our Vigil@nce team determined that the severity of this cybersecurity weakness is medium.

The trust level is of type confirmed by the editor, with an origin of user account.

An attacker with a expert ability can exploit this computer vulnerability bulletin.

Solutions for this threat 

Citrix XenDesktop: workaround for upgrade.
A workaround is to check permissions of policy rules after an upgrade from version 5.x to 7.0.
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