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Mandriva Linux Security Advisory MDVSA-2009:016
Package : xen
Date : January 16, 2009
Affected: Corporate 4.0
Ian Jackson found a security issue in the QEMU block device drivers
backend that could allow a guest operating system to issue a block
device request and read or write arbitrary memory locations, which
could then lead to privilege escalation (CVE-2008-0928).
It was found that Xen allowed unprivileged DomU domains to overwrite
xenstore values which should only be changeable by the privileged
Dom0 domain. An attacker able to control a DomU domain could possibly
use this flaw to kill arbitrary processes in Dom0 or trick a Dom0
user into accessing the text console of a different domain running
on the same host. This update makes certain parts of xenstore tree
read-only to unprivilged DomU domains (CVE-2008-4405).
A vulnerability in the qemu-dm.debug script was found in how it
created a temporary file in /tmp. A local attacker in Dom0 could
potentially use this flaw to overwrite arbitrary files via a symlink
attack (CVE-2008-4993). Since this script is not used in production,
it has been removed from this update package.
The updated packages have been patched to prevent these issues.
To upgrade automatically use MandrivaUpdate or urpmi. The verification
of md5 checksums and GPG signatures is performed automatically for you.
All packages are signed by Mandriva for security. You can obtain the
GPG public key of the Mandriva Security Team by executing:
gpg --recv-keys --keyserver pgp.mit.edu 0x22458A98
You can view other update advisories for Mandriva Linux at:
If you want to report vulnerabilities, please contact
Type Bits/KeyID Date User ID
pub 1024D/22458A98 2000-07-10 Mandriva Security Team