CVE-2012-3494 Denial of service in n/a
Local guest users can crash the host system by writing to reserved bits in the debug control register on x86-64 Xen hypervisors.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2012-3494?
CVE-2012-3494 is a low-severity denial of service vulnerability in Citrix Xenserver, published on 23 Nov 2012. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
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.
Weakness: CWE-264
Which versions are affected by CVE-2012-3494?
It affects 2 products.
Products include Citrix Xenserver, Xen Xen.
How do I fix CVE-2012-3494?
Apply the vendor's patch.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2012-3494 being exploited?
There is no known exploitation of CVE-2012-3494 in the wild and no public exploit code.
Other vulnerabilities in Citrix Xenserver
Sources
Also known as DEBIAN-CVE-2012-3494, GHSA-6p48-jg39-2mq7.