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The final version of the CSI 6.0 has been released. 
Find out why this is not just another Patch Management solution: http://secunia.com/blog/325/

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TITLE:
Xen Multiple Denial of Service and Privilege Escalation
Vulnerabilities

SECUNIA ADVISORY ID:
SA50472

VERIFY ADVISORY:
Secunia.com
http://secunia.com/advisories/50472/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=50472

RELEASE DATE:
2012-09-05

DISCUSS ADVISORY:
http://secunia.com/advisories/50472/#comments

AVAILABLE ON SITE AND IN CUSTOMER AREA:
 * Last Update
 * Popularity
 * Comments
 * Criticality Level
 * Impact
 * Where
 * Solution Status
 * Operating System / Software
 * CVE Reference(s)

http://secunia.com/advisories/50472/

ONLY AVAILABLE IN CUSTOMER AREA:
 * Authentication Level
 * Report Reliability
 * Secunia PoC
 * Secunia Analysis
 * Systems Affected
 * Approve Distribution
 * Remediation Status
 * Secunia CVSS Score
 * CVSS

https://ca.secunia.com/?page=viewadvisory&vuln_id=50472

ONLY AVAILABLE WITH SECUNIA CSI AND SECUNIA PSI:
 * AUTOMATED SCANNING

http://secunia.com/vulnerability_scanning/personal/
http://secunia.com/vulnerability_scanning/corporate/wsus_sccm_3rd_third_party_patching/

DESCRIPTION:
Some vulnerabilities have been reported in Xen, which can be
exploited by malicious, local users in a guest virtual machine to
cause a DoS (Denial of Service) and potentially gain escalated
privileges.

1) An error when handling writes to the DR7 debug control register
can be exploited to cause a crash via the "set_debugreg" hypercall.

2) An error within the "PHYSDEVOP_get_free_pirq" hypercall when
allocating a physical IRQ does not properly verify the return value
of a call to get_free_pirq.

3) An error within the "XENMEM_populate_physmap" macro when handling
certain flags can be exploited to cause a crash via the
MEMF_populate_on_demand flag.

4) An array indexing error within "PHYSDEVOP_map_pirq" can be
exploited to cause a crash.

5) An error when handling VT100 sequences can be exploited to
overwrite portions of the device model's address space and gain
escalated privileges.

The vulnerabilities are reported in versions 4.1, 4.0, and 3.4
(please see the vendor's advisory for more information).

SOLUTION:
Apply patches (please see the vendor's advisory for more
information).

Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

PROVIDED AND/OR DISCOVERED BY:
1, 5) Reported by the vendor
2, 3, 4) The vendor credits Matthew Daley

ORIGINAL ADVISORY:
XSA-12:
http://lists.xen.org/archives/html/xen-announce/2012-09/msg00000.html

XSA-13:
http://lists.xen.org/archives/html/xen-announce/2012-09/msg00001.html

XSA-14:
http://lists.xen.org/archives/html/xen-announce/2012-09/msg00002.html

XSA-16:
http://lists.xen.org/archives/html/xen-announce/2012-09/msg00005.html

XSA-17:
http://lists.xen.org/archives/html/xen-announce/2012-09/msg00003.html

OTHER REFERENCES:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

DEEP LINKS:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED DESCRIPTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXTENDED SOLUTION:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

EXPLOIT:
Further details available in Customer Area:
http://secunia.com/vulnerability_intelligence/

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About:
This Advisory was delivered by Secunia as a free service to help
private users keeping their systems up to date against the latest
vulnerabilities.

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