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CVE-2021-3996

Date: August 22, 2022

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.

Language: C

Severity Score

5.5

Related Resources (16)

Url: https://bugzilla.redhat.com/show_bug.cgi?id=2024628

Url: http://www.openwall.com/lists/oss-security/2022/11/30/2

Url: https://security.gentoo.org/glsa/202401-08

Url: https://www.openwall.com/lists/oss-security/2022/01/24/2

Url: https://security.netapp.com/advisory/ntap-20221209-0002/

Url: https://github.com/util-linux/util-linux/commit/018a10907fa9885093f6d87401556932c2d8bd2b

Url: http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.html

Url: https://access.redhat.com/security/cve/CVE-2021-3996

Url: https://security-tracker.debian.org/tracker/CVE-2021-3996

Url: https://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.37/v2.37.3-ReleaseNotes

Url: https://people.canonical.com/~ubuntu-security/cve/CVE-2021-3996

Url: https://github.com/util-linux/util-linux/commit/166e87368ae88bf31112a30e078cceae637f4cdb

Url: http://seclists.org/fulldisclosure/2022/Dec/4

Url: https://nvd.nist.gov/vuln/detail/CVE-2021-3996

Url: https://security.alpinelinux.org/vuln/CVE-2021-3996

Url: https://www.mend.io/vulnerability-database/CVE-2021-3996

Severity Score

5.5

Weakness Type (CWE)

Files or Directories Accessible to External Parties

CWE-552

CVSS v3.1

Base Score:	5.5
Attack Vector (AV):	LOCAL
Attack Complexity (AC):	LOW
Privileges Required (PR):	LOW
User Interaction (UI):	NONE
Scope (S):	UNCHANGED
Confidentiality (C):	NONE
Integrity (I):	NONE
Availability (A):	HIGH

Mend.io Vulnerability Database

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CVE-2021-3996

Date: August 22, 2022

Language: C

Severity Score

Related Resources (16)

Severity Score

Weakness Type (CWE)

CVSS v3.1

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