[RHSA-2012:0309-03] Low: sudo security and bug fix update

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Red Hat Security Advisory

 

Synopsis: Low: sudo security and bug fix update

Advisory ID: RHSA-2012:0309-03

Product: Red Hat Enterprise Linux

Advisory URL: https://rhn.redhat.com/errata/RHSA-2012-0309.html

Issue date: 2012-02-21

CVE Names: CVE-2011-0010

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1. Summary:

 

An updated sudo package that fixes one security issue and various bugs is

now available for Red Hat Enterprise Linux 5.

 

The Red Hat Security Response Team has rated this update as having low

security impact. A Common Vulnerability Scoring System (CVSS) base score,

which gives a detailed severity rating, is available from the CVE link in

the References section.

 

2. Relevant releases/architectures:

 

Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64

Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64

 

3. 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. (BZ#673072)

 

* 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.

(BZ#617061)

 

* 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. (BZ#627543)

 

* 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. (BZ#750318)

 

* 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. (BZ#697111)

 

* 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. (BZ#477185)

 

* 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. (BZ#673157)

 

All users of sudo are advised to upgrade to this updated package, which

resolves these issues.

 

4. Solution:

 

Before applying this update, make sure all previously-released errata

relevant to your system have been applied.

 

This update is available via the Red Hat Network. Details on how to

use the Red Hat Network to apply this update are available at

https://access.redhat.com/kb/docs/DOC-11259

 

5. Bugs fixed (http://bugzilla.redhat.com/):

 

477185 - sudo changes uid before calling SELInux calls, preventing it from setting terminal context when using non priv account

627543 - The Runas_Spec are ignored in sudoers file

668879 - CVE-2011-0010 sudo: does not ask for password on GID changes

673072 - sudo segfault

673157 - sudo fails to report error correctly when execv(3) fails

697111 - sudo -l inserts new lines based on terminal width, causing errors when output is piped.

 

6. Package List:

 

Red Hat Enterprise Linux Desktop (v. 5 client):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/sudo-1.7.2p1-13.el5.src.rpm

 

i386:

sudo-1.7.2p1-13.el5.i386.rpm

sudo-debuginfo-1.7.2p1-13.el5.i386.rpm

 

x86_64:

sudo-1.7.2p1-13.el5.x86_64.rpm

sudo-debuginfo-1.7.2p1-13.el5.x86_64.rpm

 

Red Hat Enterprise Linux (v. 5 server):

 

Source:

ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/sudo-1.7.2p1-13.el5.src.rpm

 

i386:

sudo-1.7.2p1-13.el5.i386.rpm

sudo-debuginfo-1.7.2p1-13.el5.i386.rpm

 

ia64:

sudo-1.7.2p1-13.el5.ia64.rpm

sudo-debuginfo-1.7.2p1-13.el5.ia64.rpm

 

ppc:

sudo-1.7.2p1-13.el5.ppc.rpm

sudo-debuginfo-1.7.2p1-13.el5.ppc.rpm

 

s390x:

sudo-1.7.2p1-13.el5.s390x.rpm

sudo-debuginfo-1.7.2p1-13.el5.s390x.rpm

 

x86_64:

sudo-1.7.2p1-13.el5.x86_64.rpm

sudo-debuginfo-1.7.2p1-13.el5.x86_64.rpm

 

These packages are GPG signed by Red Hat for security. Our key and

details on how to verify the signature are available from

https://access.redhat.com/security/team/key/#package

 

7. References:

 

https://www.redhat.com/security/data/cve/CVE-2011-0010.html

https://access.redhat.com/security/updates/classification/#low

 

8. Contact:

 

The Red Hat security contact is . More contact

details at https://access.redhat.com/security/team/contact/

 

Copyright 2012 Red Hat, Inc.

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