RHEL 7 : bash (RHSA-2017:1931)

This script is Copyright (C) 2017 Tenable Network Security, Inc.


Synopsis :

The remote Red Hat host is missing one or more security updates.

Description :

An update for bash is now available for Red Hat Enterprise Linux 7.

Red Hat Product Security has rated this update as having a security
impact of Moderate. A Common Vulnerability Scoring System (CVSS) base
score, which gives a detailed severity rating, is available for each
vulnerability from the CVE link(s) in the References section.

The bash packages provide Bash (Bourne-again shell), which is the
default shell for Red Hat Enterprise Linux.

Security Fix(es) :

* An arbitrary command injection flaw was found in the way bash
processed the hostname value. A malicious DHCP server could use this
flaw to execute arbitrary commands on the DHCP client machines running
bash under specific circumstances. (CVE-2016-0634)

* An arbitrary command injection flaw was found in the way bash
processed the SHELLOPTS and PS4 environment variables. A local,
authenticated attacker could use this flaw to exploit poorly written
setuid programs to elevate their privileges under certain
circumstances. (CVE-2016-7543)

* A denial of service flaw was found in the way bash handled popd
commands. A poorly written shell script could cause bash to crash
resulting in a local denial of service limited to a specific bash
session. (CVE-2016-9401)

Additional Changes :

For detailed information on changes in this release, see the Red Hat
Enterprise Linux 7.4 Release Notes linked from the References section.

See also :

http://www.nessus.org/u?70a6f8bb
http://rhn.redhat.com/errata/RHSA-2017-1931.html
https://www.redhat.com/security/data/cve/CVE-2016-0634.html
https://www.redhat.com/security/data/cve/CVE-2016-7543.html
https://www.redhat.com/security/data/cve/CVE-2016-9401.html

Solution :

Update the affected bash, bash-debuginfo and / or bash-doc packages.

Risk factor :

High / CVSS Base Score : 7.2
(CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 5.3
(CVSS2#E:U/RL:OF/RC:C)
Public Exploit Available : false

Family: Red Hat Local Security Checks

Nessus Plugin ID: 102105 ()

Bugtraq ID:

CVE ID: CVE-2016-0634
CVE-2016-7543
CVE-2016-9401

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