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CVE-2021-21284

Status Candidate

Overview

In Docker before versions 9.03.15, 20.10.3 there is a vulnerability involving the --userns-remap option in which access to remapped root allows privilege escalation to real root. When using "--userns-remap", if the root user in the remapped namespace has access to the host filesystem they can modify files under "/var/lib/docker/<remapping>" that cause writing files with extended privileges. Versions 20.10.3 and 19.03.15 contain patches that prevent privilege escalation from remapped user.

Related Files

Gentoo Linux Security Advisory 202107-23
Posted Jul 11, 2021
Authored by Gentoo | Site security.gentoo.org

Gentoo Linux Security Advisory 202107-23 - Multiple vulnerabilities have been found in Docker, the worst of which could result in privilege escalation to root on the host. Versions less than 20.10.3 are affected.

tags | advisory, root, vulnerability
systems | linux, gentoo
advisories | CVE-2021-21284, CVE-2021-21285
SHA-256 | 0cd8e8e65fe4f369319f0374393cf4dc19f00acd49fbeeffa4205f683fc79660
Debian Security Advisory 4865-1
Posted Feb 28, 2021
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4865-1 - Multiple security issues were discovered in Docker, a Linux container runtime, which could result in denial of service, an information leak or privilege escalation.

tags | advisory, denial of service
systems | linux, debian
advisories | CVE-2020-15157, CVE-2020-15257, CVE-2021-21284, CVE-2021-21285
SHA-256 | 7dc2d80b850f6bd28a9e9f63dfe2208b8767f34538778cfff1dac3efbf2d1d04
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