Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Xen | Xen | <= 4.14.0 |
| Debian | Debian Linux | 10.0 |
| Fedoraproject | Fedora | 32 |
Related Weaknesses (CWE)
References
- http://www.openwall.com/lists/oss-security/2020/12/16/3Mailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://www.debian.org/security/2020/dsa-4812Third Party Advisory
- https://xenbits.xenproject.org/xsa/advisory-322.htmlPatchVendor Advisory
- http://www.openwall.com/lists/oss-security/2020/12/16/3Mailing ListThird Party Advisory
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro
- https://www.debian.org/security/2020/dsa-4812Third Party Advisory
- https://xenbits.xenproject.org/xsa/advisory-322.htmlPatchVendor Advisory
FAQ
What is CVE-2020-29481?
CVE-2020-29481 is a vulnerability with a CVSS score of 8.8 (HIGH). 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...
How severe is CVE-2020-29481?
CVE-2020-29481 has been rated HIGH with a CVSS base score of 8.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2020-29481?
Check the references section above for vendor advisories and patch information. Affected products include: Xen Xen, Debian Debian Linux, Fedoraproject Fedora.