Actu
Vigil@nce - Xen: privilege escalation via I/O Port Access
May 2016 by Vigil@nce
This bulletin was written by Vigil@nce : https://vigilance.fr/offer
SYNTHESIS OF THE VULNERABILITY
A local attacker can perform input/output operations on Xen with
Linux x86-64, in order to escalate his privileges, or to obtain
sensitive data.
Impacted products: Fedora, Linux, Ubuntu.
Severity: 2/4.
Creation date: 17/03/2016.
DESCRIPTION OF THE VULNERABILITY
The Xen product can be incorporated with Linux x86-64.
However, in this case, the IRET (interrupted return) and POPF (pop
flags) instructions do not update the flag EFLAGS.IOPL (I/O
Privilege Level).
A local attacker can therefore perform input/output operations on
Xen with Linux x86-64, in order to escalate his privileges, or to
obtain sensitive data.
ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN
https://vigilance.fr/vulnerability/Xen-privilege-escalation-via-I-O-Port-Access-19188
