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Category:   Application (Generic)  >   Sudo Vendors:   Miller, Todd C.
(Red Hat Issues Fix) Sudo Supplemental Group Privilege Error Lets Certain Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1021689
SecurityTracker URL:  http://securitytracker.com/id/1021689
CVE Reference:   CVE-2009-0034   (Links to External Site)
Date:  Feb 5 2009
Impact:   Root access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.6.9 - 1.6.9p19
Description:   A vulnerability was reported in Sudo. A local user can obtain elevated privileges on the target system in certain cases.

The software does not properly process supplemental group entries in the 'sudoers' configuration file. A local user that is permitted to run commands as any user of a group that the local user is also a member of can run certain commands with root privileges.

Harald Koenig reported this vulnerability.

Impact:   A local user can obtain root privileges on the target system in certain cases.
Solution:   Red Hat has released a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2009-0267.html

Vendor URL:  www.sudo.ws/sudo/alerts/group_vector.html (Links to External Site)
Cause:   Access control 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.
Feb 5 2009 Sudo Supplemental Group Privilege Error Lets Certain Local Users Gain Elevated Privileges



 Source Message Contents

Subject:  [RHSA-2009:0267-01] Moderate: sudo security update


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

Synopsis:          Moderate: sudo security update
Advisory ID:       RHSA-2009:0267-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2009-0267.html
Issue date:        2009-02-05
CVE Names:         CVE-2009-0034 
=====================================================================

1. Summary:

An updated sudo package to fix a security issue is now available for Red
Hat Enterprise Linux 5.

This update has been rated as having moderate security impact by the Red
Hat Security Response Team.

2. Relevant releases/architectures:

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

3. Description:

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

A flaw was discovered in a way sudo handled group specifications in "run
as" lists in the sudoers configuration file. If sudo configuration allowed
a user to run commands as any user of some group and the user was also a
member of that group, sudo incorrectly allowed them to run defined commands
with the privileges of any system user. This gave the user unintended
privileges. (CVE-2009-0034)

Users of sudo should update to this updated package, which contains a
backported patch to resolve this issue.

4. Solution:

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied.

This update is available via Red Hat Network. Details on how to use
the Red Hat Network to apply this update are available at
http://kbase.redhat.com/faq/docs/DOC-11259

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

481720 - CVE-2009-0034 sudo: incorrect handling of groups in Runas_User

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-1.6.9p17-3.el5_3.1.src.rpm

i386:
sudo-1.6.9p17-3.el5_3.1.i386.rpm
sudo-debuginfo-1.6.9p17-3.el5_3.1.i386.rpm

x86_64:
sudo-1.6.9p17-3.el5_3.1.x86_64.rpm
sudo-debuginfo-1.6.9p17-3.el5_3.1.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/sudo-1.6.9p17-3.el5_3.1.src.rpm

i386:
sudo-1.6.9p17-3.el5_3.1.i386.rpm
sudo-debuginfo-1.6.9p17-3.el5_3.1.i386.rpm

ia64:
sudo-1.6.9p17-3.el5_3.1.ia64.rpm
sudo-debuginfo-1.6.9p17-3.el5_3.1.ia64.rpm

ppc:
sudo-1.6.9p17-3.el5_3.1.ppc.rpm
sudo-debuginfo-1.6.9p17-3.el5_3.1.ppc.rpm

s390x:
sudo-1.6.9p17-3.el5_3.1.s390x.rpm
sudo-debuginfo-1.6.9p17-3.el5_3.1.s390x.rpm

x86_64:
sudo-1.6.9p17-3.el5_3.1.x86_64.rpm
sudo-debuginfo-1.6.9p17-3.el5_3.1.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://www.redhat.com/security/team/key/#package

7. References:

http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-0034
http://www.redhat.com/security/updates/classification/#moderate

8. Contact:

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

Copyright 2009 Red Hat, Inc.
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