Secunia Security Advisory - 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.
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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:
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* Comments
* Criticality Level
* Impact
* Where
* Solution Status
* Operating System / Software
* CVE Reference(s)
http://secunia.com/advisories/50472/
ONLY AVAILABLE IN CUSTOMER AREA:
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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:
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