Advisories ยป MGASA-2014-0525

Updated qemu packages fix security vulnerabilities

Publication date: 13 Dec 2014
Type: security
Affected Mageia releases : 4
CVE: CVE-2014-7840 , CVE-2014-8106


Updated qemu packages fix security vulnerabilities:

During migration, the values read from migration stream during ram load are
not validated. Especially offset in host_from_stream_offset() and also the
length of the writes in the callers of the said function. A user able to
alter the savevm data (either on the disk or over the wire during migration)
could use either of these flaws to corrupt QEMU process memory on the
(destination) host, which could potentially result in arbitrary code
execution on the host with the privileges of the QEMU process

Paolo Bonzini of Red Hat discovered that the blit region checks were
insufficient in the Cirrus VGA emulator in qemu. A privileged guest user
could use this flaw to write into qemu address space on the host,
potentially escalating their privileges to those of the qemu host process