Secunia Security Advisory - Multiple 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.
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TITLE:
Xen Multiple Vulnerabilities
SECUNIA ADVISORY ID:
SA51397
VERIFY ADVISORY:
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http://secunia.com/advisories/51397/
Customer Area (Credentials Required)
https://ca.secunia.com/?page=viewadvisory&vuln_id=51397
RELEASE DATE:
2012-12-04
DISCUSS ADVISORY:
http://secunia.com/advisories/51397/#comments
AVAILABLE ON SITE AND IN CUSTOMER AREA:
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* CVE Reference(s)
http://secunia.com/advisories/51397/
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https://ca.secunia.com/?page=viewadvisory&vuln_id=51397
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http://secunia.com/vulnerability_scanning/personal/
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DESCRIPTION:
Multiple 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 downgrading a grant table version of a guest can be
exploited to cause a hypervisor crash.
2) An error when handling certain HVM control operations can be
exploited to consume physical CPU resources.
3) An array-indexing error in the "HVMOP_set_mem_access" operation
handler can be exploited to cause a crash.
4) An error in the "XENMEM_exchange" handler may result in guest
provided addresses to be included in the hypervisor's reserved
range.
5) An error in the "guest_physmap_mark_populate_on_demand()" function
when checking subject GFNs can be exploited to cause a hang.
6) An error when handling "extent_order" values for
"XENMEM_decrease_reservation", "XENMEM_populate_physmap", and
"XENMEM_exchange" can be exploited to cause a hang.
7) An error in the "get_page_from_gfn()" function when handling an
input GFN can be exploited to reference memory outside of the frame
table.
Please see the vendor's advisory for a list of affected versions.
SOLUTION:
Apply patches (please see the vendor's advisory for details).
PROVIDED AND/OR DISCOVERED BY:
Reported by the vendor.
ORIGINAL ADVISORY:
Xen (XSA-26, XSA-27, XSA-28, XSA-29, XSA-30, XSA-31, XSA-32):
http://lists.xen.org/archives/html/xen-announce/2012-12/msg00000.html
http://seclists.org/oss-sec/2012/q4/401
http://lists.xen.org/archives/html/xen-announce/2012-12/msg00003.html
http://lists.xen.org/archives/html/xen-announce/2012-12/msg00004.html
http://lists.xen.org/archives/html/xen-announce/2012-12/msg00005.html
http://lists.xen.org/archives/html/xen-announce/2012-12/msg00001.html
http://lists.xen.org/archives/html/xen-announce/2012-12/msg00002.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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