Vulnerability Monitor

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CVE-2012-3494

The set_debugreg hypercall in include/asm-x86/debugreg.h in Xen 4.0, 4.1, and 4.2, and Citrix XenServer 6.0.2 and earlier, when running on x86-64 systems, allows local OS guest users to cause a denial of service (host crash) by writing to the reserved bits of the DR7 debug control register.

Security Impact Summary

CVE-2012-3494 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

2012-11-23T20:55:03.057

Last Modified

2025-04-11T00:51:21.963

Status

Deferred

Source

[email protected]

Severity

CVSSv2: 2.1 (LOW)

CVSSv2 Vector

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

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

Exploitability Score

3.9

Impact Score

2.9

Weaknesses

Type: Primary
CWE-264

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	citrix	xenserver	≤ 6.0.2	Yes
Application	citrix	xenserver	≤ 6.0.2	Yes
Operating System	xen	xen	4.0.0	Yes
Operating System	xen	xen	4.0.0	Yes
Operating System	xen	xen	4.1.0	Yes
Operating System	xen	xen	4.1.0	Yes
Operating System	xen	xen	4.2.0	Yes
Operating System	xen	xen	4.2.0	Yes

References

http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00001.html ([email protected])
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/msg00005.html ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00012.html ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00017.html ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00018.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/msg00000.html ([email protected])
http://osvdb.org/85197 ([email protected])
http://secunia.com/advisories/50472 Vendor Advisory ([email protected])
http://secunia.com/advisories/50530 Vendor Advisory ([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 Patch, Vendor Advisory ([email protected])
http://wiki.xen.org/wiki/Security_Announcements#XSA-12_hypercall_set_debugreg_vulnerability ([email protected])
http://www.debian.org/security/2012/dsa-2544 ([email protected])
http://www.openwall.com/lists/oss-security/2012/09/05/5 ([email protected])
http://www.securityfocus.com/bid/55400 ([email protected])
http://www.securitytracker.com/id?1027479 ([email protected])
https://bugzilla.redhat.com/show_bug.cgi?id=851139 ([email protected])
https://exchange.xforce.ibmcloud.com/vulnerabilities/78265 ([email protected])
https://security.gentoo.org/glsa/201604-03 ([email protected])
http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00001.html (af854a3a-2127-422b-91ae-364da2661108)
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/msg00005.html (af854a3a-2127-422b-91ae-364da2661108)
http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00012.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/2012-09/msg00018.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/msg00000.html (af854a3a-2127-422b-91ae-364da2661108)
http://osvdb.org/85197 (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/50472 Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://secunia.com/advisories/50530 Vendor Advisory (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 Patch, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://wiki.xen.org/wiki/Security_Announcements#XSA-12_hypercall_set_debugreg_vulnerability (af854a3a-2127-422b-91ae-364da2661108)
http://www.debian.org/security/2012/dsa-2544 (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2012/09/05/5 (af854a3a-2127-422b-91ae-364da2661108)
http://www.securityfocus.com/bid/55400 (af854a3a-2127-422b-91ae-364da2661108)
http://www.securitytracker.com/id?1027479 (af854a3a-2127-422b-91ae-364da2661108)
https://bugzilla.redhat.com/show_bug.cgi?id=851139 (af854a3a-2127-422b-91ae-364da2661108)
https://exchange.xforce.ibmcloud.com/vulnerabilities/78265 (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.