Vulnerability Monitor

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CVE-2012-3495

The physdev_get_free_pirq hypercall in arch/x86/physdev.c in Xen 4.1.x and Citrix XenServer 6.0.2 and earlier uses the return value of the get_free_pirq function as an array index without checking that the return value indicates an error, which allows guest OS users to cause a denial of service (invalid memory write and host crash) and possibly gain privileges via unspecified vectors.

Security Impact Summary

CVE-2012-3495 is a security vulnerability that . Impacting 2 products from citrix, from xen organizations running these solutions should prioritize assessment and patching.

Historical Context

Documented in 2012, this vulnerability occurred amid the cloud computing expansion era, where traditional network perimeter security models were being reevaluated. Organizations were transitioning from isolated infrastructure to interconnected systems, creating new attack surfaces that vulnerabilities like this could exploit.

Published

2012-11-23T20:55:03.150

Last Modified

2025-04-11T00:51:21.963

Status

Deferred

Source

[email protected]

Severity

CVSSv2: 6.1 (MEDIUM)

CVSSv2 Vector

AV:L/AC:L/Au:N/C:P/I:P/A:C

Access Vector: LOCAL
Access Complexity: LOW
Authentication: NONE
Confidentiality Impact: PARTIAL
Integrity Impact: PARTIAL
Availability Impact: COMPLETE

Exploitability Score

3.9

Impact Score

8.5

Weaknesses

Type: Primary
CWE-20

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	citrix	xenserver	≤ 6.0.2	Yes
Application	citrix	xenserver	5.0	Yes
Application	citrix	xenserver	5.5	Yes
Application	citrix	xenserver	5.6	Yes
Application	citrix	xenserver	5.6	Yes
Application	citrix	xenserver	5.6	Yes
Application	citrix	xenserver	6.0	Yes
Operating System	xen	xen	4.1.0	Yes
Operating System	xen	xen	4.1.1	Yes
Operating System	xen	xen	4.1.2	Yes
Operating System	xen	xen	4.1.3	Yes

References

http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00003.html ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00004.html ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00017.html ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2012-11/msg00017.html ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2012-11/msg00018.html ([email protected])
http://lists.xen.org/archives/html/xen-announce/2012-09/msg00001.html ([email protected])
http://secunia.com/advisories/51413 ([email protected])
http://secunia.com/advisories/55082 ([email protected])
http://security.gentoo.org/glsa/glsa-201309-24.xml ([email protected])
http://support.citrix.com/article/CTX134708 ([email protected])
http://wiki.xen.org/wiki/Security_Announcements#XSA-13_hypercall_physdev_get_free_pirq_vulnerability ([email protected])
http://www.openwall.com/lists/oss-security/2012/09/05/6 ([email protected])
http://www.securityfocus.com/bid/55406 ([email protected])
http://www.securitytracker.com/id?1027480 ([email protected])
http://xenbits.xen.org/hg/xen-4.1-testing.hg/rev/6779ddca8593 ([email protected])
https://security.gentoo.org/glsa/201604-03 ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00003.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00004.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00017.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-security-announce/2012-11/msg00017.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-security-announce/2012-11/msg00018.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.xen.org/archives/html/xen-announce/2012-09/msg00001.html (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/51413 (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/55082 (af854a3a-2127-422b-91ae-364da2661108)
http://security.gentoo.org/glsa/glsa-201309-24.xml (af854a3a-2127-422b-91ae-364da2661108)
http://support.citrix.com/article/CTX134708 (af854a3a-2127-422b-91ae-364da2661108)
http://wiki.xen.org/wiki/Security_Announcements#XSA-13_hypercall_physdev_get_free_pirq_vulnerability (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2012/09/05/6 (af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/bid/55406 (af854a3a-2127-422b-91ae-364da2661108)
http://www.securitytracker.com/id?1027480 (af854a3a-2127-422b-91ae-364da2661108)
http://xenbits.xen.org/hg/xen-4.1-testing.hg/rev/6779ddca8593 (af854a3a-2127-422b-91ae-364da2661108)
https://security.gentoo.org/glsa/201604-03 (af854a3a-2127-422b-91ae-364da2661108)

How SecUtils Interprets This CVE

SecUtils normalizes and enriches National Vulnerability Database (NVD) records by standardizing vendor and product identifiers, aggregating vulnerability metadata from both NVD and MITRE sources, and providing structured context for security teams. For citrix's affected products, we extract Common Platform Enumeration (CPE) data, Common Weakness Enumeration (CWE) classifications, CVSS severity metrics, and reference data to enable rapid vulnerability prioritization and asset correlation. This record contains no exploit code, proof-of-concept instructions, or attack methodologies—only defensive intelligence necessary for patch management, risk assessment, and security operations.