ESB-2018.0703 - [Linux][Debian] util-linux: Increased privileges - Existing account 2018-03-12

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             AUSCERT External Security Bulletin Redistribution

                               ESB-2018.0703
                        util-linux security update
                               12 March 2018

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        AusCERT Security Bulletin Summary
        ---------------------------------

Product:           util-linux
Publisher:         Debian
Operating System:  Debian GNU/Linux 9
                   Linux variants
Impact/Access:     Increased Privileges -- Existing Account
Resolution:        Patch/Upgrade
CVE Names:         CVE-2018-7738  

Original Bulletin: 
   http://www.debian.org/security/2018/dsa-4134

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-4134-1                   security@debian.org
https://www.debian.org/security/                     Salvatore Bonaccorso
March 10, 2018                        https://www.debian.org/security/faq
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Package        : util-linux
CVE ID         : CVE-2018-7738
Debian Bug     : 892179

Bjorn Bosselmann discovered that the umount bash completion from
util-linux does not properly handle embedded shell commands in a
mountpoint name. An attacker with rights to mount filesystems can take
advantage of this flaw for privilege escalation if a user (in particular
root) is tricked into using the umount completion while a specially
crafted mount is present.

For the stable distribution (stretch), this problem has been fixed in
version 2.29.2-1+deb9u1.

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/

Mailing list: debian-security-announce@lists.debian.org
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