CVE-2021-3996
- State
- Published
- Severity
- 5.5 Medium
- Published
- Aug 23, 2022
- Updated
- Oct 15, 2024
- Reserved
- Nov 22, 2021
Description
A logic error was found in the libmount library of util-linux in the function that allows an unprivileged user to unmount a FUSE filesystem. This flaw allows a local user on a vulnerable system to unmount other users' filesystems that are either world-writable themselves (like /tmp) or mounted in a world-writable directory. An attacker may use this flaw to cause a denial of service to applications that use the affected filesystems.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 5.5 Medium | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H | CISA-ADP |
Weaknesses
- CWE-552 Files or Directories Accessible to External Parties
Affected Products
| Product | Versions |
|---|---|
util-linuxn/a |
|
References
- https://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.37/v2.37.3-ReleaseNotes
- https://github.com/util-linux/util-linux/commit/166e87368ae88bf31112a30e078cceae637f4cdb
- https://www.openwall.com/lists/oss-security/2022/01/24/2
- https://bugzilla.redhat.com/show_bug.cgi?id=2024628
- https://access.redhat.com/security/cve/CVE-2021-3996
- [oss-security] 20221130 Race condition in snap-confine's must_mkdir_and_open_with_perms() (CVE-2022-3328)mailing-list
- 20221208 Race condition in snap-confine's must_mkdir_and_open_with_perms() (CVE-2022-3328)mailing-list
- http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.html
- https://security.netapp.com/advisory/ntap-20221209-0002/
- GLSA-202401-08vendor-advisory
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