CVE-2020-29479
First published: Tue Dec 15 2020(Updated: )
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.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/xen | 4.11.4+107-gef32c7afa2-1 4.14.6-1 4.14.5+94-ge49571868d-1 4.17.1+2-gb773c48e36-1 4.17.2+55-g0b56bed864-1 | |
| Xen xen-unstable | <=4.14.0 | |
| Debian | =10.0 | |
| Fedora | =32 | |
| Fedora | =33 |
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Reference Links
- https://xenbits.xen.org/xsa/advisory-353.html
- https://security-tracker.debian.org/tracker/CVE-2020-29479
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2C6M6S3CIMEBACH6O7V4H2VDANMO6TVA/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/OBLV6L6Q24PPQ2CRFXDX4Q76KU776GKI/
- https://security.gentoo.org/glsa/202107-30
- https://www.debian.org/security/2020/dsa-4812
- https://xenbits.xenproject.org/xsa/advisory-353.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/OBLV6L6Q24PPQ2CRFXDX4Q76KU776GKI/
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/2C6M6S3CIMEBACH6O7V4H2VDANMO6TVA/
Frequently Asked Questions
What is the severity of CVE-2020-29479?
The severity of CVE-2020-29479 is high with a CVSS score of 8.8.
What software is affected by CVE-2020-29479?
The affected software includes Xen versions 4.11.4, 4.14.5, 4.14.6, 4.17.1, and 4.17.2, as well as Xen Xen version up to and including 4.14.0.
How can I find more information about CVE-2020-29479?
You can find more information about CVE-2020-29479 on the Xen Security Advisory and Debian Security Tracker websites.
- collector/security-tracker-debian
- agent/type
- collector/mitre-cve
- source/MITRE
- agent/remedy
- agent/references
- agent/severity
- agent/last-modified-date
- agent/weakness
- agent/author
- agent/event
- agent/first-publish-date
- agent/description
- agent/source
- agent/softwarecombine
- agent/tags
- collector/nvd-index
- agent/software-canonical-lookup-request
- package-manager/debian
- vendor/xen
- canonical/xen xen-unstable
- version/xen xen-unstable/4.14.0
- vendor/debian
- canonical/debian
- version/debian/10.0
- vendor/fedoraproject
- canonical/fedora
- version/fedora/32
- version/fedora/33