Scientific Linux Security Update : sudo on SL5.x i386/x86_64

This script is Copyright (C) 2012 Tenable Network Security, Inc.


Synopsis :

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

Description :

The sudo (superuser do) utility allows system administrators to give
certain users the ability to run commands as root.

A flaw was found in the sudo password checking logic. In
configurations where the sudoers settings allowed a user to run a
command using sudo with only the group ID changed, sudo failed to
prompt for the user's password before running the specified command
with the elevated group privileges. (CVE-2011-0010)

In addition, this update fixes the following bugs :

- A NULL pointer dereference bug caused the sudo utility
to terminate unexpectedly with a segmentation fault.
This happened if the utility was run with the -g option
and configured not to demand the password from the user
who ran the sudo utility. With this update, the code has
been modified and the problem no longer occurs.

- The sudo utility failed to load sudoers from an LDAP
(Lightweight Directory Access Protocol) server after the
sudo tool was upgraded. This happened because the
upgraded nsswitch.conf file did not contain the
instruction to search for sudoers on the LDAP server.
This update adds the lost instruction to
/etc/nsswitch.conf and the system searches for sources
of sudoers on the local file system and then on LDAP, if
applicable.

- The sudo tool interpreted a Runas alias specifying a
group incorrectly as a user alias and the alias seemed
to be ignored. With this update, the code for
interpreting such aliases has been modified and the
Runas group aliases are honored as expected.

- Prior to this update, sudo did not parse comment
characters (#) in the ldap.conf file correctly and could
fail to work. With this update, parsing of the LDAP
configuration file has been modified and the comment
characters are parsed correctly.

- The sudo utility formats its output to fit the width of
the terminal window. However, this behavior is
undesirable if the output is redirected through a
pipeline. With this update, the output formatting is not
applied in the scenario described.

- Previously, the sudo utility performed Security-Enhanced
Linux (SELinux) related initialization after switching
to an unprivileged user. This prevented the correct
setup of the SELinux environment before executing the
specified command and could potentially cause an access
denial. The bug has been fixed by backporting the
SELinux related code and the execution model from a
newer version of sudo.

- On execv(3) function failure, the sudo tool executed an
auditing call before reporting the failure. The call
reset the error state and, consequently, the tool
incorrectly reported that the command succeeded. With
this update, the code has been modified and the problem
no longer occurs.

All users of sudo are advised to upgrade to this updated package,
which resolves these issues.

See also :

http://www.nessus.org/u?3a9251d0

Solution :

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

Risk factor :

Medium / CVSS Base Score : 4.4
(CVSS2#AV:L/AC:M/Au:N/C:P/I:P/A:P)

Family: Scientific Linux Local Security Checks

Nessus Plugin ID: 61271 ()

Bugtraq ID:

CVE ID: CVE-2011-0010