util-linux: Denial of service - Existing account

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                         ZMCIRT Vulnerability Bulletin

                             ZMC-2022.25.01.0800
                util-linux: Denial of service - Existing account
                               25th January 2022

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Product:           util-linux
Publisher:         Debian
Operating System:  Debian GNU/Linux
                   UNIX variants (UNIX, Linux, OSX)
Impact/Access:     Denial of Service -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2021-3996 CVE-2021-3995 

Original Bulletin: 
   https://lists.debian.org/debian-security-announce/2022/msg00021.html

Comment: This advisory references vulnerabilities in products which run on 
         platforms other than Debian. It is recommended that administrators 
         running util-linux check for an updated version of the software for
         their operating system.

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Debian Security Advisory DSA-5055-1                   security@debian.org
https://www.debian.org/security/                     Salvatore Bonaccorso
January 24, 2022                      https://www.debian.org/security/faq
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Package        : util-linux
CVE ID         : CVE-2021-3995 CVE-2021-3996

The Qualys Research Labs discovered two vulnerabilities in util-linux's
libmount. These flaws allow an unprivileged user to unmount other users'
filesystems that are either world-writable themselves or mounted in a
world-writable directory (CVE-2021-3996), or to unmount FUSE filesystems
that belong to certain other users (CVE-2021-3995).

For the stable distribution (bullseye), these problems have been fixed in
version 2.36.1-8+deb11u1.

We recommend that you upgrade your util-linux packages.

For the detailed security status of util-linux please refer to its
security tracker page at:
https://security-tracker.debian.org/tracker/util-linux

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at: https://www.debian.org/security/


 
ZMCIRT has made every effort to ensure that the information contained
in this document is accurate.  However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. ZMCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.

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