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CVE-2020-29479

Status Candidate

Overview

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.

Related Files

Gentoo Linux Security Advisory 202107-30
Posted Jul 13, 2021
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202107-30 - Multiple vulnerabilities have been found in Xen, the worst of which could result in privilege escalation. Versions less than 4.15.0-r1 are affected.

tags | advisory, vulnerability
systems | linux, gentoo
advisories | CVE-2020-29479, CVE-2020-29486, CVE-2020-29487, CVE-2020-29566, CVE-2020-29567, CVE-2020-29568, CVE-2020-29569, CVE-2020-29570, CVE-2020-29571, CVE-2021-0089, CVE-2021-26313, CVE-2021-28687, CVE-2021-28690, CVE-2021-28691, CVE-2021-28692, CVE-2021-28693, CVE-2021-3308
SHA-256 | 36d5f476b51c23defc6f7d17ba7518ef98181a7154a78a23daa94e2802513ab7
Debian Security Advisory 4812-1
Posted Dec 28, 2020
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4812-1 - Multiple vulnerabilities have been discovered in the Xen hypervisor.

tags | advisory, vulnerability
systems | linux, debian
advisories | CVE-2020-29479, CVE-2020-29480, CVE-2020-29481, CVE-2020-29482, CVE-2020-29483, CVE-2020-29484, CVE-2020-29485, CVE-2020-29486, CVE-2020-29566, CVE-2020-29570, CVE-2020-29571
SHA-256 | 37919a1fdf97980cfdebe6aa11ee31f4bf0b9ebf838344befc1d3a7c22df1c49
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