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Debian Security Advisory 4134-1

Debian Security Advisory 4134-1
Posted Mar 10, 2018
Authored by Debian | Site debian.org

Debian Linux Security Advisory 4134-1 - 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.

tags | advisory, shell, root, bash
systems | linux, debian
advisories | CVE-2018-7738
MD5 | 739295b248b871432986dbfe7125e245

Debian Security Advisory 4134-1

Change Mirror Download
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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
- -------------------------------------------------------------------------

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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