CVE-2021-41091
MEDIUMMoby < 20.10.9 - Unprivileged Host User Data Exposure and Privilege Escalation via Insufficient Directory Permissions
Title source: llmExploitation Summary
EIP tracks 4 public exploits for CVE-2021-41091. PoCs published by UncleJ4ck, SNE-M23-SN, JorgeRh4ck.
AI-analyzed exploit summary This repository contains a working exploit for CVE-2021-41091, a privilege escalation vulnerability in Moby (Docker Engine) due to improperly restricted permissions in /var/lib/docker/overlay2. The exploit script checks for vulnerable Docker versions and attempts to spawn a root shell by leveraging setuid binaries in container filesystems.
Description
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.
Exploits (4)
This repository contains a working exploit for CVE-2021-41091, a privilege escalation vulnerability in Moby (Docker Engine) due to improperly restricted permissions in /var/lib/docker/overlay2. The exploit script checks for vulnerable Docker versions and attempts to spawn a root shell by leveraging setuid binaries in container filesystems.
This PoC exploits CVE-2021-41091, a Docker Engine vulnerability allowing unprivileged users to traverse and execute setuid programs in the Docker data directory. The exploit script checks for vulnerable Docker versions, iterates over overlay2 filesystems, and spawns a root shell if a setuid binary is found.
This repository contains a functional exploit for CVE-2021-41091, a directory traversal vulnerability in Moby (Docker Engine) that allows unprivileged users to execute programs on the host machine with elevated privileges. The exploit involves running scripts inside a container and on the host to achieve privilege escalation via a SUID binary.
This PoC exploits CVE-2021-41091, a directory traversal vulnerability in Moby (Docker Engine), allowing unprivileged users to execute programs from the container on the host machine with elevated privileges. The exploit involves setting the SUID bit on /bin/bash within the container and leveraging directory traversal to execute it on the host.
References (5)
Scores
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L