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Related Vulnerabilities: CVE-2021-3995 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 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. (CVE-2021-3995) 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. (CVE-2021-3996)

Source

ALAS2022-2022-086

Amazon Linux 2022 Security Advisory: ALAS-2022-086
Advisory Release Date: 2022-06-01 17:54 Pacific
Advisory Updated Date: 2022-06-10 00:15 Pacific

Severity: Medium

References: CVE-2021-3995 CVE-2021-3996

Issue Overview:

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. (CVE-2021-3995)

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. (CVE-2021-3996)

Affected Packages:

util-linux

Issue Correction:
Run yum update util-linux to update your system.

New Packages:

aarch64:
    libblkid-debuginfo-2.37.4-1.amzn2022.aarch64
    libblkid-devel-2.37.4-1.amzn2022.aarch64
    libsmartcols-2.37.4-1.amzn2022.aarch64
    libuuid-devel-2.37.4-1.amzn2022.aarch64
    uuidd-debuginfo-2.37.4-1.amzn2022.aarch64
    util-linux-user-2.37.4-1.amzn2022.aarch64
    util-linux-core-debuginfo-2.37.4-1.amzn2022.aarch64
    libmount-devel-2.37.4-1.amzn2022.aarch64
    libsmartcols-devel-2.37.4-1.amzn2022.aarch64
    uuidd-2.37.4-1.amzn2022.aarch64
    python3-libmount-debuginfo-2.37.4-1.amzn2022.aarch64
    libmount-debuginfo-2.37.4-1.amzn2022.aarch64
    libfdisk-2.37.4-1.amzn2022.aarch64
    libmount-2.37.4-1.amzn2022.aarch64
    util-linux-user-debuginfo-2.37.4-1.amzn2022.aarch64
    libfdisk-devel-2.37.4-1.amzn2022.aarch64
    util-linux-core-2.37.4-1.amzn2022.aarch64
    util-linux-debuginfo-2.37.4-1.amzn2022.aarch64
    python3-libmount-2.37.4-1.amzn2022.aarch64
    libsmartcols-debuginfo-2.37.4-1.amzn2022.aarch64
    util-linux-debugsource-2.37.4-1.amzn2022.aarch64
    libuuid-2.37.4-1.amzn2022.aarch64
    util-linux-2.37.4-1.amzn2022.aarch64
    libuuid-debuginfo-2.37.4-1.amzn2022.aarch64
    libblkid-2.37.4-1.amzn2022.aarch64
    libfdisk-debuginfo-2.37.4-1.amzn2022.aarch64

i686:
    util-linux-debugsource-2.37.4-1.amzn2022.i686
    util-linux-core-debuginfo-2.37.4-1.amzn2022.i686
    util-linux-debuginfo-2.37.4-1.amzn2022.i686
    util-linux-2.37.4-1.amzn2022.i686
    util-linux-core-2.37.4-1.amzn2022.i686
    libfdisk-debuginfo-2.37.4-1.amzn2022.i686
    libblkid-debuginfo-2.37.4-1.amzn2022.i686
    libmount-debuginfo-2.37.4-1.amzn2022.i686
    libsmartcols-debuginfo-2.37.4-1.amzn2022.i686
    libfdisk-2.37.4-1.amzn2022.i686
    libmount-2.37.4-1.amzn2022.i686
    libblkid-2.37.4-1.amzn2022.i686
    python3-libmount-debuginfo-2.37.4-1.amzn2022.i686
    libsmartcols-2.37.4-1.amzn2022.i686
    python3-libmount-2.37.4-1.amzn2022.i686
    util-linux-user-debuginfo-2.37.4-1.amzn2022.i686
    libuuid-debuginfo-2.37.4-1.amzn2022.i686
    uuidd-debuginfo-2.37.4-1.amzn2022.i686
    util-linux-user-2.37.4-1.amzn2022.i686
    uuidd-2.37.4-1.amzn2022.i686
    libmount-devel-2.37.4-1.amzn2022.i686
    libuuid-2.37.4-1.amzn2022.i686
    libfdisk-devel-2.37.4-1.amzn2022.i686
    libblkid-devel-2.37.4-1.amzn2022.i686
    libsmartcols-devel-2.37.4-1.amzn2022.i686
    libuuid-devel-2.37.4-1.amzn2022.i686

src:
    util-linux-2.37.4-1.amzn2022.src

x86_64:
    libmount-debuginfo-2.37.4-1.amzn2022.x86_64
    python3-libmount-debuginfo-2.37.4-1.amzn2022.x86_64
    uuidd-debuginfo-2.37.4-1.amzn2022.x86_64
    libsmartcols-debuginfo-2.37.4-1.amzn2022.x86_64
    libsmartcols-2.37.4-1.amzn2022.x86_64
    util-linux-debugsource-2.37.4-1.amzn2022.x86_64
    libsmartcols-devel-2.37.4-1.amzn2022.x86_64
    util-linux-core-debuginfo-2.37.4-1.amzn2022.x86_64
    libblkid-2.37.4-1.amzn2022.x86_64
    libfdisk-devel-2.37.4-1.amzn2022.x86_64
    uuidd-2.37.4-1.amzn2022.x86_64
    util-linux-debuginfo-2.37.4-1.amzn2022.x86_64
    libuuid-debuginfo-2.37.4-1.amzn2022.x86_64
    libblkid-devel-2.37.4-1.amzn2022.x86_64
    util-linux-user-2.37.4-1.amzn2022.x86_64
    libuuid-2.37.4-1.amzn2022.x86_64
    libuuid-devel-2.37.4-1.amzn2022.x86_64
    util-linux-core-2.37.4-1.amzn2022.x86_64
    libmount-devel-2.37.4-1.amzn2022.x86_64
    libblkid-debuginfo-2.37.4-1.amzn2022.x86_64
    util-linux-2.37.4-1.amzn2022.x86_64
    libmount-2.37.4-1.amzn2022.x86_64
    libfdisk-debuginfo-2.37.4-1.amzn2022.x86_64
    util-linux-user-debuginfo-2.37.4-1.amzn2022.x86_64
    python3-libmount-2.37.4-1.amzn2022.x86_64
    libfdisk-2.37.4-1.amzn2022.x86_64

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