Brian Goff

3 exploits Active since Feb 2021
CVE-2021-41091 WRITEUP MEDIUM WRITEUP
Moby < 20.10.9 - Unprivileged Host User Data Exposure and Privilege Escalation via Insufficient Directory Permissions
Moby is an open-source project created by Docker to enable software containerization. A bug was found in Moby (Docker Engine) where the data directory (typically `/var/lib/docker`) contained subdirectories with insufficiently restricted permissions, allowing otherwise unprivileged Linux users to traverse directory contents and execute programs. When containers included executable programs with extended permission bits (such as `setuid`), unprivileged Linux users could discover and execute those programs. When the UID of an unprivileged Linux user on the host collided with the file owner or group inside a container, the unprivileged Linux user on the host could discover, read, and modify those files. This bug has been fixed in Moby (Docker Engine) 20.10.9. Users should update to this version as soon as possible. Running containers should be stopped and restarted for the permissions to be fixed. For users unable to upgrade limit access to the host to trusted users. Limit access to host volumes to trusted containers.
CVSS 6.3
CVE-2021-21284 WRITEUP MEDIUM WRITEUP
Docker <9.03.15, 20.10.3 - Privilege Escalation
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.
CVSS 6.8
CVE-2021-21285 WRITEUP MEDIUM WRITEUP
Docker < 19.03.15 and 20.10.3 - Denial of Service via Malformed Image Manifest
In Docker before versions 9.03.15, 20.10.3 there is a vulnerability in which pulling an intentionally malformed Docker image manifest crashes the dockerd daemon. Versions 20.10.3 and 19.03.15 contain patches that prevent the daemon from crashing.
CVSS 6.5