CVE-2020-29482
First published: Tue Dec 15 2020(Updated: )
An issue was discovered in Xen through 4.14.x. A guest may access xenstore paths via absolute paths containing a full pathname, or via a relative path, which implicitly includes /local/domain/$DOMID for their own domain id. Management tools must access paths in guests' namespaces, necessarily using absolute paths. oxenstored imposes a pathname limit that is applied solely to the relative or absolute path specified by the client. Therefore, a guest can create paths in its own namespace which are too long for management tools to access. Depending on the toolstack in use, a malicious guest administrator might cause some management tools and debugging operations to fail. For example, a guest administrator can cause "xenstore-ls -r" to fail. However, a guest administrator cannot prevent the host administrator from tearing down the domain. 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 |
|---|---|---|
| Xen Xen | <=4.14.0 | |
| Debian Debian Linux | =10.0 | |
| Fedoraproject Fedora | =32 | |
| Fedoraproject Fedora | =33 | |
| 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 |
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Reference Links
- 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://www.debian.org/security/2020/dsa-4812
- https://xenbits.xenproject.org/xsa/advisory-323.html
- https://xenbits.xen.org/xsa/advisory-323.html
- https://security-tracker.debian.org/tracker/CVE-2020-29482
- 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 CVE-2020-29482?
CVE-2020-29482 is a vulnerability in Xen, versions through 4.14.x, that allows a guest to access xenstore paths via absolute or relative paths.
How does CVE-2020-29482 affect Xen?
CVE-2020-29482 affects Xen versions through 4.14.x and allows a guest to access xenstore paths.
What is the severity of CVE-2020-29482?
The severity of CVE-2020-29482 is medium with a CVSS score of 6.
How can I fix CVE-2020-29482?
To fix CVE-2020-29482, upgrade to Xen version 4.11.4+107-gef32c7afa2-1, 4.14.6 - 4.14.5+94-ge49571868d-1, 4.17.1+2-gb773c48e36-1, or 4.17.2+55-g0b56bed864-1.
Where can I find more information about CVE-2020-29482?
You can find more information about CVE-2020-29482 on the Debian security advisory DSA-4812 (https://www.debian.org/security/2020/dsa-4812) and the Fedora project announcement (https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2C6M6S3CIMEBACH6O7V4H2VDANMO6TVA/).
- collector/nvd-index
- collector/security-tracker-debian
- agent/type
- agent/severity
- agent/weakness
- agent/references
- agent/author
- agent/description
- agent/event
- agent/remedy
- agent/last-modified-date
- agent/softwarecombine
- agent/first-publish-date
- agent/tags
- collector/mitre-cve
- source/MITRE
- vendor/xen
- canonical/xen xen
- version/xen xen/4.14.0
- vendor/debian
- canonical/debian debian linux
- version/debian debian linux/10.0
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- version/fedoraproject fedora/32
- version/fedoraproject fedora/33
- package-manager/debian