CVE-2012-3494
First published: Thu Aug 23 2012(Updated: )
set_debugreg allows writes to reserved bits of the DR7 debug control register on x86-64. A malicious guest can cause the host to crash, leading to a DoS. If the vulnerable hypervisor is run on future hardware, the impact of the vulnerability might be widened depending on the future assignment of the currently-reserved debug register bits. All systems running 64-bit paravirtualised guests are vulnerable to this issue. Acknowledgements: Red Hat would like to thank the Xen project for reporting this issue.
Credit: secalert@redhat.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| XenServer | <=6.0.2 | |
| XenServer | <=6.0.2 | |
| Xen XAPI | =4.0.0 | |
| Xen XAPI | =4.0.0 | |
| Xen XAPI | =4.1.0 | |
| Xen XAPI | =4.1.0 | |
| Xen XAPI | =4.2.0 | |
| Xen XAPI | =4.2.0 |
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Reference Links
- http://seclists.org/oss-sec/2012/q3/376
- https://bugzilla.redhat.com/show_bug.cgi/show_bug.cgi?id=854585
- https://bugzilla.redhat.com/show_bug.cgi?id=851139
- 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://exchange.xforce.ibmcloud.com/vulnerabilities/78265
- https://security.gentoo.org/glsa/201604-03
Frequently Asked Questions
What is the severity of CVE-2012-3494?
CVE-2012-3494 has been classified as a high severity vulnerability due to its potential to allow unauthorized access to reserved bits in the debug control register.
How do I fix CVE-2012-3494?
To mitigate CVE-2012-3494, it is recommended to update to the latest version of Citrix XenServer or Xen that has addressed this vulnerability.
Which versions are affected by CVE-2012-3494?
CVE-2012-3494 affects Citrix XenServer versions up to and including 6.0.2 and Xen versions 4.0.0, 4.1.0, and 4.2.0.
What type of systems are impacted by CVE-2012-3494?
CVE-2012-3494 impacts x86 and x86-64 architectures running vulnerable versions of Citrix XenServer and Xen.
Is there a workaround for CVE-2012-3494?
There are no specific workarounds for CVE-2012-3494, so upgrading to a patched version is the best course of action.
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