CVE-2021-3995

Summary

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.

Affected Software

Weaknesses

• CWE-552: CWE-552 - Files or Directories Accessible to External Parties

ADP Enrichment

CVE Program Container

Additional References

• https://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.37/v2.37.3-ReleaseNotes
• https://www.openwall.com/lists/oss-security/2022/01/24/2
• https://github.com/util-linux/util-linux/commit/57202f5713afa2af20ffbb6ab5331481d0396f8d
• https://bugzilla.redhat.com/show_bug.cgi?id=2024631https://access.redhat.com/security/cve/CVE-2021-3995
• http://www.openwall.com/lists/oss-security/2022/11/30/2
• http://seclists.org/fulldisclosure/2022/Dec/4
• http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.html
• https://security.netapp.com/advisory/ntap-20221209-0002/
• https://security.gentoo.org/glsa/202401-08

References

• https://mirrors.edge.kernel.org/pub/linux/utils/util-linux/v2.37/v2.37.3-ReleaseNotes
• https://www.openwall.com/lists/oss-security/2022/01/24/2
• https://github.com/util-linux/util-linux/commit/57202f5713afa2af20ffbb6ab5331481d0396f8d
• https://bugzilla.redhat.com/show_bug.cgi?id=2024631https://access.redhat.com/security/cve/CVE-2021-3995
• http://www.openwall.com/lists/oss-security/2022/11/30/2
• http://seclists.org/fulldisclosure/2022/Dec/4
• http://packetstormsecurity.com/files/170176/snap-confine-must_mkdir_and_open_with_perms-Race-Condition.html
• https://security.netapp.com/advisory/ntap-20221209-0002/
• https://security.gentoo.org/glsa/202401-08

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