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Mandriva Linux Security Advisory 2009-016

Mandriva Linux Security Advisory 2009-016
Posted Jan 16, 2009
Authored by Mandriva | Site mandriva.com

Mandriva Linux Security Advisory 2009-016 - 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. 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 unprivileged DomU domains. 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. 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.

tags | advisory, arbitrary, local
systems | linux, mandriva
advisories | CVE-2008-0928, CVE-2008-4405, CVE-2008-4993
SHA-256 | bf0f92b3794ad63079798172dc4b4074c87c0b0c4c4de75dc91b2b558aa648ce

Mandriva Linux Security Advisory 2009-016

Change Mirror Download

-----BEGIN PGP SIGNED MESSAGE-----
Hash: SHA1

_______________________________________________________________________

Mandriva Linux Security Advisory MDVSA-2009:016
http://www.mandriva.com/security/
_______________________________________________________________________

Package : xen
Date : January 16, 2009
Affected: Corporate 4.0
_______________________________________________________________________

Problem Description:

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.
_______________________________________________________________________

References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-0928
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-4405
http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2008-4993
_______________________________________________________________________

Updated Packages:

Corporate 4.0:
3785ed3cf9eaf4abb8842713706daeb3 corporate/4.0/i586/xen-3.0.1-3.2.20060mlcs4.i586.rpm
22f6a2eced04422519cbf734df73d453 corporate/4.0/SRPMS/xen-3.0.1-3.2.20060mlcs4.src.rpm

Corporate 4.0/X86_64:
450884c01338338d57834dd0b4947805 corporate/4.0/x86_64/xen-3.0.1-3.2.20060mlcs4.x86_64.rpm
22f6a2eced04422519cbf734df73d453 corporate/4.0/SRPMS/xen-3.0.1-3.2.20060mlcs4.src.rpm
_______________________________________________________________________

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:

http://www.mandriva.com/security/advisories

If you want to report vulnerabilities, please contact

security_(at)_mandriva.com
_______________________________________________________________________

Type Bits/KeyID Date User ID
pub 1024D/22458A98 2000-07-10 Mandriva Security Team
<security*mandriva.com>
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