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CVE-2021-3995 Detail

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 an unprivileged local attacker to unmount FUSE filesystems that belong to certain other users who have a UID that is a prefix of the UID of the attacker in its string form. An attacker may use this flaw to cause a denial of service to applications that use the affected filesystems.


Severity



CVSS 3.x Severity and Metrics:

NIST CVSS score
NIST: NVD
Base Score:  5.5 MEDIUM
Vector:  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H


NVD Analysts use publicly available information to associate vector strings and CVSS scores. We also display any CVSS information provided within the CVE List from the CNA.

Note: NVD Analysts have published a CVSS score for this CVE based on publicly available information at the time of analysis. The CNA has not provided a score within the CVE List.

References to Advisories, Solutions, and Tools

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Hyperlink Resource
http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.html Third Party Advisory  VDB Entry 
http://seclists.org/fulldisclosure/2022/Dec/4 Mailing List  Third Party Advisory 
http://www.openwall.com/lists/oss-security/2022/11/30/2 Mailing List  Third Party Advisory 
https://bugzilla.redhat.com/show_bug.cgi?id=2024631https://access.redhat.com/security/cve/CVE-2021-3995 Broken Link  Issue Tracking 
https://github.com/util-linux/util-linux/commit/57202f5713afa2af20ffbb6ab5331481d0396f8d Patch  Third Party Advisory 
https://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.37/v2.37.3-ReleaseNotes Release Notes  Vendor Advisory 
https://security.gentoo.org/glsa/202401-08
https://security.netapp.com/advisory/ntap-20221209-0002/ Third Party Advisory 
https://www.openwall.com/lists/oss-security/2022/01/24/2 Exploit  Mailing List  Patch  Third Party Advisory 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-552 Files or Directories Accessible to External Parties cwe source acceptance level NIST   Contributor acceptance level Red Hat, Inc.  

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Change History

9 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-3995
NVD Published Date:
08/23/2022
NVD Last Modified:
01/07/2024
Source:
Red Hat, Inc.