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.
The product makes files or directories accessible to unauthorized actors, even though they should not be.
| Link | Tags |
|---|---|
| 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 | mailing list patch exploit third party advisory |
| https://github.com/util-linux/util-linux/commit/57202f5713afa2af20ffbb6ab5331481d0396f8d | third party advisory patch |
| https://bugzilla.redhat.com/show_bug.cgi?id=2024631https://access.redhat.com/security/cve/CVE-2021-3995 | issue tracking broken link |
| http://www.openwall.com/lists/oss-security/2022/11/30/2 | third party advisory mailing list |
| http://seclists.org/fulldisclosure/2022/Dec/4 | third party advisory mailing list |
| http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.html | vdb entry third party advisory |
| https://security.netapp.com/advisory/ntap-20221209-0002/ | third party advisory |
| https://security.gentoo.org/glsa/202401-08 | vendor advisory |