Scientific Linux Security Update : sudo on SL6.x i386/x86_64

This script is Copyright (C) 2015-2017 Tenable Network Security, Inc.


Synopsis :

The remote Scientific Linux host is missing one or more security
updates.

Description :

It was discovered that sudo did not perform any checks of the TZ
environment variable value. If sudo was configured to preserve the TZ
environment variable, a local user with privileges to execute commands
via sudo could possibly use this flaw to achieve system state changes
not permitted by the configured commands. (CVE-2014-9680)

Note: The default sudoers configuration in Scientific Linux 6 removes
the TZ variable from the environment in which commands run by sudo are
executed.

This update also fixes the following bugs :

- Previously, the sudo utility child processes could
sometimes become unresponsive because they ignored the
SIGPIPE signal. With this update, SIGPIPE handler is
properly restored in the function that reads passwords
from the user, and the child processes no longer ignore
SIGPIPE. As a result, sudo child processes do not hang
in this situation.

- Prior to this update, the order in which sudo rules were
processed did not honor the user-defined sudoOrder
attribute. Consequently, sudo rules were processed in an
undefined order even when the user defined the order in
sudoOrder. The implementation of SSSD support in sudo
has been modified to sort the rules according to the
sudoOrder value, and sudo rules are now sorted in the
order defined by the user in sudoOrder.

- Previously, sudo became unresponsive after the user
issued a command when a sudoers source was mentioned
multiple times in the /etc/nsswitch.conf file. The
problem occurred when nsswitch.conf contained, for
example, the 'sudoers: files sss sss' entry. The sudoers
source processing code has been fixed to correctly
handle multiple instances of the same sudoers source. As
a result, sudo no longer hangs when a sudoers source is
mentioned multiple times in /etc/nsswitch.conf.

In addition, this update adds the following enhancement :

- The sudo utility now supports I/O logs compressed using
the zlib library. With this update, sudo can generate
zlib compressed I/O logs and also process zlib
compressed I/O logs generated by other versions of sudo
with zlib support.

See also :

http://www.nessus.org/u?273aa3f3

Solution :

Update the affected sudo, sudo-debuginfo and / or sudo-devel packages.

Risk factor :

Low / CVSS Base Score : 2.1
(CVSS2#AV:L/AC:L/Au:N/C:P/I:N/A:N)

Family: Scientific Linux Local Security Checks

Nessus Plugin ID: 85207 ()

Bugtraq ID:

CVE ID: CVE-2014-9680

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