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CVE-2021-41089

Published: 4 October 2021

Moby is an open-source project created by Docker to enable software containerization. A bug was found in Moby (Docker Engine) where attempting to copy files using `docker cp` into a specially-crafted container can result in Unix file permission changes for existing files in the host’s filesystem, widening access to others. This bug does not directly allow files to be read, modified, or executed without an additional cooperating process. This bug has been fixed in Moby (Docker Engine) 20.10.9. Users should update to this version as soon as possible. Running containers do not need to be restarted.

From the Ubuntu security team

Lei Wang and Ruizhi Xiao discovered that the Moby Docker engine subsystem in Docker incorrectly allowed the docker cp command to make permissions changes in the host filesystem in some situations. A local attacker could possibly use to this to expose sensitive information or gain administrative privileges.

Priority

Medium

CVSS 3 base score: 6.3

Status

Package Release Status
docker.io
Launchpad, Ubuntu, Debian
bionic
Released (20.10.7-0ubuntu1~18.04.2)
focal
Released (20.10.7-0ubuntu1~20.04.2)
hirsute
Released (20.10.7-0ubuntu1~21.04.2)
impish
Released (20.10.7-0ubuntu5)
jammy
Released (20.10.7-0ubuntu7)
trusty Does not exist

upstream
Released (20.10.9)
xenial
Released (18.09.7-0ubuntu1~16.04.9+esm1)