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[Full-disclosure] [ MDVSA-2009:016 ] xen

From: <security_at_nospam>
Date: Fri Jan 16 2009 - 18:16:00 GMT
To: full-disclosure@lists.grok.org.uk

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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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