CVE-2020-29481 Information disclosure in n/a
A new domain can inherit access rights from a destroyed domain, allowing it to read sensitive Xenstore data belonging to other guests.
- 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-2020-29481?
CVE-2020-29481 is a high-severity vulnerability in Debian Debian Linux, published on 15 Dec 2020. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
An issue was discovered in Xen through 4.14.x. Access rights of Xenstore nodes are per domid. Unfortunately, existing granted access rights are not removed when a domain is being destroyed. This means that a new domain created with the same domid will inherit the access rights to Xenstore nodes from the previous domain(s) with the same domid. Because all Xenstore entries of a guest below /local/domain/<domid> are being deleted by Xen tools when a guest is destroyed, only Xenstore entries of other guests still running are affected. For example, a newly created guest domain might be able to read sensitive information that had belonged to a previously existing guest domain. Both Xenstore implementations (C and Ocaml) are vulnerable.
Weakness: CWE-269
Which versions are affected by CVE-2020-29481?
It affects 3 products.
Products include Debian Debian Linux, Fedoraproject Fedora, Xen Xen.
How do I fix CVE-2020-29481?
Apply the vendor's patch.
Is CVE-2020-29481 being exploited?
There is no known exploitation of CVE-2020-29481 in the wild and no public exploit code.
Other vulnerabilities in Debian Debian Linux
Sources
Also known as ALPINE-CVE-2020-29481, DEBIAN-CVE-2020-29481, GHSA-vcqm-hqq4-5mxm, UBUNTU-CVE-2020-29481.