Xen 3.4, 4.0, and 4.1, when the guest OS has not registered a handler for a syscall or sysenter instruction, does not properly clear a flag for exception injection when injecting a General Protection Fault, which allows local PV guest OS users to cause a denial of service (guest crash) by later triggering an exception that would normally be handled within Xen.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Xen | Xen | 3.4.0 (including) | 3.4.0 (including) |
| Xen | Xen | 4.0.0 (including) | 4.0.0 (including) |
| Xen | Xen | 4.1.0 (including) | 4.1.0 (including) |
| Xen | Ubuntu | oneiric | * |
| Xen | Ubuntu | precise | * |
| Xen | Ubuntu | upstream | * |
| Xen-3.1 | Ubuntu | hardy | * |
| Xen-3.2 | Ubuntu | hardy | * |
| Xen-3.3 | Ubuntu | lucid | * |
| Xen-3.3 | Ubuntu | natty | * |
References
- http://lists.xen.org/archives/html/xen-announce/2012-06/msg00003.html
- http://secunia.com/advisories/55082
- http://security.gentoo.org/glsa/glsa-201309-24.xml
- http://www.debian.org/security/2012/dsa-2501
- http://lists.xen.org/archives/html/xen-announce/2012-06/msg00003.html
- http://secunia.com/advisories/55082
- http://security.gentoo.org/glsa/glsa-201309-24.xml
- http://www.debian.org/security/2012/dsa-2501