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Category:   Application (Generic)  >   Sudo Vendors:   sudo.ws
(Red Hat Issues Fix) Sudo Runas Group Matching Error Lets Local Users Gain Elevated Privileges
SecurityTracker Alert ID:  1024393
SecurityTracker URL:  http://securitytracker.com/id/1024393
CVE Reference:   CVE-2010-2956   (Links to External Site)
Date:  Sep 7 2010
Impact:   User access via local system
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.7.0 - 1.7.4p3
Description:   A vulnerability was reported in Sudo. A local user can obtain elevated privileges on the target system.

When the '-u' option is specified in addition to the '-g' option, the Runas group matching code will allow the command to be run as the specified user name as long as the specified group name is permitted by the system.

Markus Wuethrich of Swiss Post - PostFinance reported this vulnerability.

Impact:   A local user 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-2010-0675.html

Vendor URL:  www.sudo.ws/sudo/alerts/runas_group.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.
Sep 7 2010 Sudo Runas Group Matching Error Lets Local Users Gain Elevated Privileges



 Source Message Contents

Subject:  [RHSA-2010:0675-01] Important: sudo security update

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

Synopsis:          Important: sudo security update
Advisory ID:       RHSA-2010:0675-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2010-0675.html
Issue date:        2010-09-07
CVE Names:         CVE-2010-2956 
=====================================================================

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
important 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 Runas specifications containing
both a user and a group list. If a local user were authorized by the
sudoers file to perform their sudo commands with the privileges of a
specified user and group, they could use this flaw to run those commands
with the privileges of either an arbitrary user or group on the system.
(CVE-2010-2956)

Red Hat would like to thank Markus Wuethrich of Swiss Post - PostFinance
for reporting this issue.

Users of sudo should 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
http://kbase.redhat.com/faq/docs/DOC-11259

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

628628 - CVE-2010-2956 sudo: incorrect handling of RunAs specification with both user and group lists

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-1.7.2p1-8.el5_5.src.rpm

i386:
sudo-1.7.2p1-8.el5_5.i386.rpm
sudo-debuginfo-1.7.2p1-8.el5_5.i386.rpm

x86_64:
sudo-1.7.2p1-8.el5_5.x86_64.rpm
sudo-debuginfo-1.7.2p1-8.el5_5.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/sudo-1.7.2p1-8.el5_5.src.rpm

i386:
sudo-1.7.2p1-8.el5_5.i386.rpm
sudo-debuginfo-1.7.2p1-8.el5_5.i386.rpm

ia64:
sudo-1.7.2p1-8.el5_5.ia64.rpm
sudo-debuginfo-1.7.2p1-8.el5_5.ia64.rpm

ppc:
sudo-1.7.2p1-8.el5_5.ppc.rpm
sudo-debuginfo-1.7.2p1-8.el5_5.ppc.rpm

s390x:
sudo-1.7.2p1-8.el5_5.s390x.rpm
sudo-debuginfo-1.7.2p1-8.el5_5.s390x.rpm

x86_64:
sudo-1.7.2p1-8.el5_5.x86_64.rpm
sudo-debuginfo-1.7.2p1-8.el5_5.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:

https://www.redhat.com/security/data/cve/CVE-2010-2956.html
http://www.redhat.com/security/updates/classification/#important

8. Contact:

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

Copyright 2010 Red Hat, Inc.
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