CVE-2021-3996

 

Published at: - 23-08-2022 10:15

Last modified: - 26-01-2023 09:38

Total changes: - 7

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.

Common Vulnerability Scoring System (CVSS)

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

 

Verification logic

 

Reference

• https://github.com/util-linux/util-linux/commit/166e87368ae88bf31112a30e078cceae637f4cdb
• https://access.redhat.com/security/cve/CVE-2021-3996
• https://bugzilla.redhat.com/show_bug.cgi?id=2024628
• https://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.37/v2.37.3-ReleaseNotes
• https://www.openwall.com/lists/oss-security/2022/01/24/2
• [oss-security] 20221130 Race condition in snap-confine's must_mkdir_and_open_with_perms() (CVE-2022-3328)-Mailing List, Third Party Advisory
• 20221208 Race condition in snap-confine's must_mkdir_and_open_with_perms() (CVE-2022-3328)-Mailing List, Third Party Advisory
• http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.html
• https://security.netapp.com/advisory/ntap-20221209-0002/

 

Keywords

NVD

 

CVE-2021-3996

 

CVE

 

Common vulnerabilities & exposures

 

CVSS

 

Common vulnerability scoring system

 

Security

 

Vulnerabilities

 

Exposures