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Category:   Application (Generic)  >   Sudo Vendors:   sudo.ws
(Red Hat Issues Fix) Sudo validate_env_vars() Bug Lets Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1029887
SecurityTracker URL:  http://securitytracker.com/id/1029887
CVE Reference:   CVE-2014-0106   (Links to External Site)
Date:  Mar 10 2014
Impact:   Execution of arbitrary code via local system, Root access via local system, User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.6.9 to 1.8.4p5
Description:   A vulnerability was reported in Sudo. A local user can obtain elevated privileges on the target system.

On systems with the env_reset option disabled in the sudoers file, a local user with sudo permissions can exploit a logic flaw in validate_env_vars() to execute arbitrary commands on the target system with elevated privileges.

Impact:   A local user with sudo permissions can obtain elevated privileges on the target system.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2014-0266.html

Vendor URL:  www.sudo.ws/sudo/alerts/env_add.html (Links to External Site)
Cause:   Access control error, State error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  5

Message History:   This archive entry is a follow-up to the message listed below.
Mar 10 2014 Sudo validate_env_vars() Bug Lets Local Users Gain Elevated Privileges



 Source Message Contents

Subject:  [RHSA-2014:0266-01] Moderate: sudo security update

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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: sudo security update
Advisory ID:       RHSA-2014:0266-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2014-0266.html
Issue date:        2014-03-10
CVE Names:         CVE-2014-0106 
=====================================================================

1. Summary:

An updated sudo package that fixes one security issue is now available for
Red Hat Enterprise Linux 5.

The Red Hat Security Response Team has rated this update as having Moderate
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 way sudo handled its blacklist of environment
variables. When the "env_reset" option was disabled, a user permitted to
run certain commands via sudo could use this flaw to run such a command
with one of the blacklisted environment variables set, allowing them to run
an arbitrary command with the target user's privileges. (CVE-2014-0106)

Note: This issue does not affect the default configuration of the sudo
package as shipped with Red Hat Enterprise Linux 5.

Red Hat would like to thank Todd C. Miller for reporting this issue.
Upstream acknowledges Sebastien Macke as the original reporter.

All sudo users are advised to upgrade to this updated package, which
contains a backported patch to correct this issue.

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/site/articles/11258

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

1071780 - CVE-2014-0106 sudo: certain environment variables not sanitized when env_reset is disabled

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-1.7.2p1-29.el5_10.src.rpm

i386:
sudo-1.7.2p1-29.el5_10.i386.rpm
sudo-debuginfo-1.7.2p1-29.el5_10.i386.rpm

x86_64:
sudo-1.7.2p1-29.el5_10.x86_64.rpm
sudo-debuginfo-1.7.2p1-29.el5_10.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/sudo-1.7.2p1-29.el5_10.src.rpm

i386:
sudo-1.7.2p1-29.el5_10.i386.rpm
sudo-debuginfo-1.7.2p1-29.el5_10.i386.rpm

ia64:
sudo-1.7.2p1-29.el5_10.ia64.rpm
sudo-debuginfo-1.7.2p1-29.el5_10.ia64.rpm

ppc:
sudo-1.7.2p1-29.el5_10.ppc.rpm
sudo-debuginfo-1.7.2p1-29.el5_10.ppc.rpm

s390x:
sudo-1.7.2p1-29.el5_10.s390x.rpm
sudo-debuginfo-1.7.2p1-29.el5_10.s390x.rpm

x86_64:
sudo-1.7.2p1-29.el5_10.x86_64.rpm
sudo-debuginfo-1.7.2p1-29.el5_10.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-2014-0106.html
https://access.redhat.com/security/updates/classification/#moderate

8. Contact:

The Red Hat security contact is <secalert@redhat.com>.  More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2014 Red Hat, Inc.
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