Actu
Vigil@nce - Xen: information disclosure via x2APIC
October 2014 by Vigil@nce
This bulletin was written by Vigil@nce : http://vigilance.fr/offer
SYNTHESIS OF THE VULNERABILITY
A local attacker can read a memory fragment via x2APIC of Xen, in
order to obtain sensitive information.
– Impacted products: XenServer, Debian, Fedora, openSUSE, Unix
(platform)
– Severity: 2/4
– Creation date: 01/10/2014
DESCRIPTION OF THE VULNERABILITY
The Xen product implements x2APIC (Advanced Programmable Interrupt
Controller), which supports 256 MSR (Model Specific Register).
However, the hvm_msr_read_intercept() or hvm_msr_write_intercept()
function of the xen/arch/x86/hvm/hvm.c file accepts 1024 MSR, and
returns to the user a memory area located after an array.
A local attacker can therefore read a memory fragment via x2APIC
of Xen, in order to obtain sensitive information.
ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN
http://vigilance.fr/vulnerability/Xen-information-disclosure-via-x2APIC-15430
