Vulnerability Monitor

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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.

Published

2022-08-23T20:15:08.560

Last Modified

2024-11-21T06:23:20.377

Status

Modified

Source

[email protected]

Severity

CVSSv3.1: 5.5 (MEDIUM)

Weaknesses

Type: Primary
CWE-552
Type: Secondary
CWE-552

Affected Vendors & Products

Type	Vendor	Product	Version/Range	Vulnerable?
Application	kernel	util-linux	< 2.37.3	Yes
Operating System	fedoraproject	fedora	35	Yes

References

http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.html Third Party Advisory ([email protected])
http://seclists.org/fulldisclosure/2022/Dec/4 Mailing List, Third Party Advisory ([email protected])
http://www.openwall.com/lists/oss-security/2022/11/30/2 Mailing List, Third Party Advisory ([email protected])
https://access.redhat.com/security/cve/CVE-2021-3996 Issue Tracking, Third Party Advisory ([email protected])
https://bugzilla.redhat.com/show_bug.cgi?id=2024628 Issue Tracking, Patch, Third Party Advisory ([email protected])
https://github.com/util-linux/util-linux/commit/166e87368ae88bf31112a30e078cceae637f4cdb Patch, Third Party Advisory ([email protected])
https://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.37/v2.37.3-ReleaseNotes Release Notes, Vendor Advisory ([email protected])
https://security.gentoo.org/glsa/202401-08 ([email protected])
https://security.netapp.com/advisory/ntap-20221209-0002/ Broken Link, Third Party Advisory ([email protected])
https://www.openwall.com/lists/oss-security/2022/01/24/2 Exploit, Mailing List, Patch, Third Party Advisory ([email protected])
http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.html Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://seclists.org/fulldisclosure/2022/Dec/4 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
http://www.openwall.com/lists/oss-security/2022/11/30/2 Mailing List, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://access.redhat.com/security/cve/CVE-2021-3996 Issue Tracking, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://bugzilla.redhat.com/show_bug.cgi?id=2024628 Issue Tracking, Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://github.com/util-linux/util-linux/commit/166e87368ae88bf31112a30e078cceae637f4cdb Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.37/v2.37.3-ReleaseNotes Release Notes, Vendor Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://security.gentoo.org/glsa/202401-08 (af854a3a-2127-422b-91ae-364da2661108)
https://security.netapp.com/advisory/ntap-20221209-0002/ Broken Link, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)
https://www.openwall.com/lists/oss-security/2022/01/24/2 Exploit, Mailing List, Patch, Third Party Advisory (af854a3a-2127-422b-91ae-364da2661108)