Ubuntu 14.04 LTS / 16.04 LTS / 16.10 / 17.04 : bash vulnerabilities (USN-3294-1)

Ubuntu Security Notice (C) 2017 Canonical, Inc. / NASL script (C) 2017 Tenable Network Security, Inc.


Synopsis :

The remote Ubuntu host is missing a security-related patch.

Description :

Bernd Dietzel discovered that Bash incorrectly expanded the hostname
when displaying the prompt. If a remote attacker were able to modify a
hostname, this flaw could be exploited to execute arbitrary code. This
issue only affected Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and Ubuntu
16.10. (CVE-2016-0634)

It was discovered that Bash incorrectly handled the SHELLOPTS and PS4
environment variables. A local attacker could use this issue to
execute arbitrary code with root privileges. This issue only affected
Ubuntu 14.04 LTS, Ubuntu 16.04 LTS and Ubuntu 16.10. (CVE-2016-7543)

It was discovered that Bash incorrectly handled the popd command. A
remote attacker could possibly use this issue to bypass restricted
shells. (CVE-2016-9401)

It was discovered that Bash incorrectly handled path autocompletion. A
local attacker could possibly use this issue to execute arbitrary
code. This issue only affected Ubuntu 17.04. (CVE-2017-5932).

Note that Tenable Network Security has extracted the preceding
description block directly from the Ubuntu security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues.

Solution :

Update the affected bash package.

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: Ubuntu Local Security Checks

Nessus Plugin ID: 100268 ()

Bugtraq ID:

CVE ID: CVE-2016-0634
CVE-2016-7543
CVE-2016-9401
CVE-2017-5932

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