CVE-2021-41091
Docker Engine Directory Permission Escalation Vulnerability
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.
INFO
Published Date :
Oct. 4, 2021, 9:15 p.m.
Last Modified :
Nov. 7, 2023, 3:38 a.m.
Source :
[email protected]
Remotely Exploitable :
No
Impact Score :
3.7
Exploitability Score :
2.0
Public PoC/Exploit Available at Github
CVE-2021-41091 has a 4 public PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2021-41091.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
This exploit offers an in-depth look at the CVE-2021-41091 security vulnerability and provides a step-by-step guide on how to utilize the exploit script to achieve privilege escalation on a host.
Shell C HTML
None
Shell
Collection of Linux Kernel exploits for CTF.
C Shell Makefile Python
POC for CVE-2021-41091
Shell
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2021-41091 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2021-41091 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
May. 14, 2024
Action Type Old Value New Value -
CVE Modified by [email protected]
Nov. 07, 2023
Action Type Old Value New Value Added Reference GitHub, Inc. https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/ZNFADTCHHYWVM6W4NJ6CB4FNFM2VMBIB/ [No types assigned] Added Reference GitHub, Inc. https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/B5Q6G6I4W5COQE25QMC7FJY3I3PAYFBB/ [No types assigned] Removed Reference GitHub, Inc. https://lists.fedoraproject.org/archives/list/[email protected]/message/ZNFADTCHHYWVM6W4NJ6CB4FNFM2VMBIB/ Removed Reference GitHub, Inc. https://lists.fedoraproject.org/archives/list/[email protected]/message/B5Q6G6I4W5COQE25QMC7FJY3I3PAYFBB/ -
CVE Modified by [email protected]
Jun. 14, 2022
Action Type Old Value New Value Added Reference https://cert-portal.siemens.com/productcert/pdf/ssa-222547.pdf [No Types Assigned] -
Modified Analysis by [email protected]
Nov. 28, 2021
Action Type Old Value New Value Added CVSS V3.1 NIST AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/B5Q6G6I4W5COQE25QMC7FJY3I3PAYFBB/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/B5Q6G6I4W5COQE25QMC7FJY3I3PAYFBB/ Mailing List, Third Party Advisory Changed Reference Type https://lists.fedoraproject.org/archives/list/[email protected]/message/ZNFADTCHHYWVM6W4NJ6CB4FNFM2VMBIB/ No Types Assigned https://lists.fedoraproject.org/archives/list/[email protected]/message/ZNFADTCHHYWVM6W4NJ6CB4FNFM2VMBIB/ Mailing List, Third Party Advisory Added CWE NIST CWE-732 Added CPE Configuration OR *cpe:2.3:o:fedoraproject:fedora:34:*:*:*:*:*:*:* *cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:* -
CVE Modified by [email protected]
Nov. 17, 2021
Action Type Old Value New Value Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/B5Q6G6I4W5COQE25QMC7FJY3I3PAYFBB/ [No Types Assigned] -
CVE Modified by [email protected]
Nov. 10, 2021
Action Type Old Value New Value Removed Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/B5Q6G6I4W5COQE25QMC7FJY3I3PAYFBB/ [No Types Assigned] -
CVE Modified by [email protected]
Oct. 30, 2021
Action Type Old Value New Value Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/B5Q6G6I4W5COQE25QMC7FJY3I3PAYFBB/ [No Types Assigned] -
CVE Modified by [email protected]
Oct. 19, 2021
Action Type Old Value New Value Added Reference https://lists.fedoraproject.org/archives/list/[email protected]/message/ZNFADTCHHYWVM6W4NJ6CB4FNFM2VMBIB/ [No Types Assigned] -
Initial Analysis by [email protected]
Oct. 12, 2021
Action Type Old Value New Value Added CVSS V2 NIST (AV:L/AC:L/Au:N/C:P/I:P/A:P) Changed Reference Type https://github.com/moby/moby/commit/f0ab919f518c47240ea0e72d0999576bb8008e64 No Types Assigned https://github.com/moby/moby/commit/f0ab919f518c47240ea0e72d0999576bb8008e64 Patch, Third Party Advisory Changed Reference Type https://github.com/moby/moby/security/advisories/GHSA-3fwx-pjgw-3558 No Types Assigned https://github.com/moby/moby/security/advisories/GHSA-3fwx-pjgw-3558 Third Party Advisory Added CPE Configuration OR *cpe:2.3:a:mobyproject:moby:*:*:*:*:*:*:*:* versions up to (excluding) 20.10.9
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2021-41091 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2021-41091
weaknesses.
Exploit Prediction
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.
0.05 }} 0.00%
score
0.14464
percentile