CVE-2021-3995

MEDIUM5.5

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

Published Aug 23, 2022

Modified 1 years ago

Details

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.

References

WEB

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

WEB

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

WEB

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

WEB

https://bugzilla.redhat.com/show_bug.cgi?id=2024631https://access.redhat.com/security/cve/CVE-2021-3995

WEB

https://github.com/util-linux/util-linux/commit/57202f5713afa2af20ffbb6ab5331481d0396f8d

WEB