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SYNTHESIS OF THE VULNERABILITY

When a device is mounted as read-only, an attacker located in a
Xen guest system can alter or delete data.

Impacted products: Linux

Severity: 1/4

Creation date: 06/06/2013

DESCRIPTION OF THE VULNERABILITY

The drivers/block/xen-blkback/blkback.c file implements the access
to block type devices (hard drive) for Xen guest systems.

However its dispatch_discard_io() function does not check if the
device is mounted as read-only.

When a device is mounted as read-only, an attacker located in a
Xen guest system can therefore alter or delete data.

ACCESS TO THE COMPLETE VIGIL@NCE BULLETIN

http://vigilance.fr/vulnerability/Linux-kernel-data-modification-via-xen-blkback-12920