CVE-2020-29479 — Missing Authorization in XEN

CWE-862 — Missing AuthorizationCWE-732 — Incorrect Permission Assignment4 documents4 sources
Severity
8.8HIGHNVD
EPSS
0.0%
top 85.91%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
4
XENDebian XENDebian Linux+1 more
Timeline
PublishedDec 15
Latest updateMay 24

Description

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 usin…

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:HExploitability: 2.0 | Impact: 6.0

Affected Packages3 packages

▶debiandebian/xen< xen 4.14.0+88-g1d1d1f5391-1 (bookworm)
▶Debianxen/xen< 4.14.0+88-g1d1d1f5391-1+3
▶NVDxen/xen4.14.0

Also affects: Debian Linux 10.0, Fedora 32, 33

Patches

Patch: xenbits.xenproject.org ↗Patch: xenbits.xenproject.org ↗

🔴Vulnerability Details

2
GHSA
GHSA-mrwx-r54g-7x9f: An issue was discovered in Xen through 4↗2022-05-24
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OSV
CVE-2020-29479: An issue was discovered in Xen through 4↗2020-12-15
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📋Vendor Advisories

1
Debian
CVE-2020-29479: xen - An issue was discovered in Xen through 4.14.x. In the Ocaml xenstored implementa...↗2020
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