UBUNTU-CVE-2020-29479
See a problem?- Source
- https://ubuntu.com/security/notices/UBUNTU-CVE-2020-29479
- Import Source
- https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-29479.json
- JSON Data
- https://api.osv.dev/v1/vulns/UBUNTU-CVE-2020-29479
- Related
- Published
- 2020-12-15T18:15:00Z
- Modified
- 2020-12-15T18:15:00Z
- Severity
-
- 8.8 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H CVSS Calculator
- Summary
- [none]
- Details
-
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.
- References
Affected packages
Ubuntu:Pro:16.04:LTS / xen
Package
- Name
- xen
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affected
Ubuntu:Pro:18.04:LTS / xen
Package
- Name
- xen
Ubuntu:20.04:LTS / xen
Package
- Name
- xen
Affected ranges
- Type
- ECOSYSTEM
- Events
-
Introduced0Unknown introduced version / All previous versions are affected