CVE Vulnerability

CVE-2021-3996

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.

5.5 /10

CVSS v3.0 : MEDIUM

V3 Legend

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References
Link Resource
https://github.com/util-linux/util-linux/commit/166e87368ae88bf31112a30e078cceae637f4cdb Patch Third Party Advisory
https://access.redhat.com/security/cve/CVE-2021-3996 Issue Tracking Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2024628 Issue Tracking Patch
https://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.37/v2.37.3-ReleaseNotes Release Notes Vendor Advisory
https://www.openwall.com/lists/oss-security/2022/01/24/2 Exploit Mailing List
http://www.openwall.com/lists/oss-security/2022/11/30/2 Mailing List Third Party Advisory
http://seclists.org/fulldisclosure/2022/Dec/4 Mailing List Third Party Advisory
http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.html Third Party Advisory
https://security.netapp.com/advisory/ntap-20221209-0002/ Broken Link Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:kernel:util-linux:*:*:*:*:*:*:*:*
cpe:2.3:o:fedoraproject:fedora:35:*:*:*:*:*:*:*
Information

Published : 2022-08-23 08:15

Updated : 2023-01-26 08:38

NVD link : CVE-2021-3996

Mitre link : CVE-2021-3996

Products Affected
No products.
CWE
CWE-552