VDB
CVE-2020-29479
CVE-2020-29479
PUBLISHED
An issue was discovered in Xen through 4.14.x. In the Ocaml xenstored implementation, the internal representation of the tree has special cases for the root node, because this node has no parent. Unfortunately, permissions were not checked for certain operations on the root node. Unprivileged guests can get and modify permissions, list, and delete the root node. (Deleting the whole xenstore tree is a host-wide denial of service.) Achieving xenstore write access is also possible. All systems using oxenstored are vulnerable. Building and using oxenstored is the default in the upstream Xen distribution, if the Ocaml compiler is available. Systems using C xenstored are not vulnerable.
EPSS 0.05% · 14.8th percentile
Risk Scores
EPSS Score
0.05%
14.8th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Ubuntu:20.04:LTS | xen | 4.9.2-0ubuntu6, 4.11.3+24-g14b62ab3e5-1ubuntu1, 4.11.3+24-g14b62ab3e5-1ubuntu2 |
| Ubuntu:18.04:LTS | xen | 4.9.0-0ubuntu3, 4.9.2-0ubuntu1, 4.9.0-0ubuntu4 |
| Ubuntu:16.04:LTS | xen | 0, 4.6.5-0ubuntu1.2, 4.5.1-0ubuntu1 |
Exploit Intelligence
- https://xenbits.xenproject.org/xsa/advisory-353.html (circl)
- DSA-4812 (circl)
- FEDORA-2020-64859a826b (circl)
- FEDORA-2020-df772b417b (circl)
- GLSA-202107-30 (circl)
Timeline
- Dec 15, 2020 CVE Published
- Apr 14, 2021 EPSS Score
- Jun 23, 2021 EPSS Score
- Aug 24, 2021 EPSS Score
- Oct 26, 2021 EPSS Score
- Jan 6, 2022 EPSS Score
- Feb 4, 2022 EPSS Score
- Feb 28, 2022 EPSS Score
- Apr 1, 2022 EPSS Score
- May 1, 2022 EPSS Score
- Jul 3, 2022 EPSS Score
- Sep 4, 2022 EPSS Score
References
- https://ubuntu.com/security/CVE-2020-29479 third-party-advisory
- https://xenbits.xen.org/xsa/advisory-353.html third-party-advisory
- https://xenbits.xen.org/xsa/xsa353.patch third-party-advisory
- https://www.cve.org/CVERecord?id=CVE-2020-29479 third-party-advisory