CVE-2022-42322 Denial of service in xen
Malicious guests can exhaust Dom0 resources by creating unlimited Xenstore nodes, leading to denial of service 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-2022-42322?
CVE-2022-42322 is a medium-severity denial of service vulnerability in Debian Debian Linux, published on 1 Nov 2022. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
Xenstore: Cooperating guests can create arbitrary numbers of nodes T[his CNA information record relates to multiple CVEs; the text explains which aspects/vulnerabilities correspond to which CVE.] Since the fix of XSA-322 any Xenstore node owned by a removed domain will be modified to be owned by Dom0. This will allow two malicious guests working together to create an arbitrary number of Xenstore nodes. This is possible by domain A letting domain B write into domain A's local Xenstore tree. Domain B can then create many nodes and reboot. The nodes created by domain B will now be owned by Dom0. By repeating this process over and over again an arbitrary number of nodes can be created, as Dom0's number of nodes isn't limited by Xenstore quota.
Weakness: CWE-401
Which versions are affected by CVE-2022-42322?
It affects 3 products.
Products include Debian Debian Linux, Fedoraproject Fedora, Xen Xen.
How do I fix CVE-2022-42322?
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-2022-42322 being exploited?
There is no known exploitation of CVE-2022-42322 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as ALPINE-CVE-2022-42322, DEBIAN-CVE-2022-42322, GHSA-cq56-j359-2484, UBUNTU-CVE-2022-42322.