CVE-2012-3495 Denial of service in n/a
Guest OS users can crash the host or potentially gain privileges via an unchecked array index in the Xen hypervisor.
- 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-2012-3495?
CVE-2012-3495 is a medium-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 physdev_get_free_pirq hypercall in arch/x86/physdev.c in Xen 4.1.x and Citrix XenServer 6.0.2 and earlier uses the return value of the get_free_pirq function as an array index without checking that the return value indicates an error, which allows guest OS users to cause a denial of service (invalid memory write and host crash) and possibly gain privileges via unspecified vectors.
Weakness: CWE-20
Which versions are affected by CVE-2012-3495?
It affects 2 products.
Products include Citrix Xenserver, Xen Xen.
How do I fix CVE-2012-3495?
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-2012-3495 being exploited?
There is no known exploitation of CVE-2012-3495 in the wild and no public exploit code.
Other vulnerabilities in Citrix Xenserver
Sources
Also known as DEBIAN-CVE-2012-3495, GHSA-w2q9-w27j-m384.