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SYNTHESIS OF THE VULNERABILITY

An attacker can generate an integer overflow in XSM/Flask of Xen,
in order to trigger a denial of service, and possibly to execute
code.

Impacted products: Fedora, Unix (platform)

Severity: 2/4

Creation date: 06/02/2014

DESCRIPTION OF THE VULNERABILITY

The Xen product can be compiled with the support of XSM (Xen
Security Module). The FLASK (Flux Advanced Security Kernel) module
implements a Mandatory Access Control.

However, if parameters of FLASK_GETBOOL, FLASK_SETBOOL, FLASK_USER
or FLASK_CONTEXT_TO_SID are too large, a multiplication overflows,
and an allocated memory area is too short.

An attacker can therefore generate an integer overflow in
XSM/Flask of Xen, in order to trigger a denial of service, and
possibly to execute code.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Xen-integer-overflow-of-XSM-Flask-14186