Description
A flaw was found in the way QEMU handled VT100 terminal escape sequences
when emulating certain character devices. A guest user with privileges to
write to a character device that is emulated on the host using a virtual
console back-end could use this flaw to crash the qemu process on the
host or, possibly, escalate their privileges on the host. (CVE-2012-3515)
This flaw did not affect the default use of the Xen hypervisor
implementation in Red Hat Enterprise Linux 5. This problem only affected
fully-virtualized guests that have a serial or parallel device that uses a
virtual console (vc) back-end. By default, the virtual console back-end is
not used for such devices; only guests explicitly configured to use them
in this way were affected.