Permissions, Privileges, and Access Controls in Xen - CVE-2012-3494
Published: November 23, 2012 / Updated: July 28, 2020
Vulnerability identifier: #VU32740
CSH Severity: Low
CVSSv4.0: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear
CVE-ID: CVE-2012-3494
CWE-ID: CWE-264
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Xen
Xen
Software vendor:
Xen Project
Xen Project
Description
The vulnerability allows a local non-authenticated attacker to perform service disruption.
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.
Remediation
Install update from vendor's website.
External links
- http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00001.html
- http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00003.html
- http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00004.html
- http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00005.html
- http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00012.html
- http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00017.html
- http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00018.html
- http://lists.opensuse.org/opensuse-security-announce/2012-11/msg00017.html
- http://lists.opensuse.org/opensuse-security-announce/2012-11/msg00018.html
- http://lists.xen.org/archives/html/xen-announce/2012-09/msg00000.html
- http://osvdb.org/85197
- http://secunia.com/advisories/50472
- http://secunia.com/advisories/50530
- http://secunia.com/advisories/51413
- http://secunia.com/advisories/55082
- http://security.gentoo.org/glsa/glsa-201309-24.xml
- http://support.citrix.com/article/CTX134708
- http://wiki.xen.org/wiki/Security_Announcements#XSA-12_hypercall_set_debugreg_vulnerability
- http://www.debian.org/security/2012/dsa-2544
- http://www.openwall.com/lists/oss-security/2012/09/05/5
- http://www.securityfocus.com/bid/55400
- http://www.securitytracker.com/id?1027479
- https://bugzilla.redhat.com/show_bug.cgi?id=851139
- https://exchange.xforce.ibmcloud.com/vulnerabilities/78265
- https://security.gentoo.org/glsa/201604-03