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Category:   Application (Generic)  >   Sudo Vendors:   sudo.ws
(Red Hat Issues Fix) Sudo Netmask Error Lets Remote Authenticated Users Bypass Host Access Controls
SecurityTracker Alert ID:  1027253
SecurityTracker URL:  http://securitytracker.com/id/1027253
CVE Reference:   CVE-2012-2337   (Links to External Site)
Date:  Jul 16 2012
Impact:   Host/resource access via network
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 1.6.9p3 through 1.8.4p4
Description:   A vulnerability was reported in Sudo. A remote authenticated user can bypass host access controls.

A remote authenticated user listed in the sudoers file (or sudoers LDAP data) and granted access to commands on hosts on one or more IPv4 networks (using IP network matching) may be able to execute a command from an unauthorized host.

Impact:   A remote authenticated user can bypass host access controls.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2012-1081.html

Vendor URL:  www.sudo.ws/sudo/alerts/netmask.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  5, 6

Message History:   This archive entry is a follow-up to the message listed below.
May 18 2012 Sudo Netmask Error Lets Remote Authenticated Users Bypass Host Access Controls



 Source Message Contents

Subject:  [RHSA-2012:1081-01] Moderate: sudo security update

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

Synopsis:          Moderate: sudo security update
Advisory ID:       RHSA-2012:1081-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2012-1081.html
Issue date:        2012-07-16
CVE Names:         CVE-2012-2337 
=====================================================================

1. Summary:

An updated sudo package that fixes one security issue is now available for
Red Hat Enterprise Linux 5 and 6.

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
Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux Server (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - 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 the network matching code in sudo handled
multiple IP networks listed in user specification configuration directives.
A user, who is authorized to run commands with sudo on specific hosts,
could use this flaw to bypass intended restrictions and run those commands
on hosts not matched by any of the network specifications. (CVE-2012-2337)

All users of sudo 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/knowledge/articles/11258

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

820677 - CVE-2012-2337 sudo: Multiple netmask values used in Host / Host_List configuration cause any host to be allowed access

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-1.7.2p1-14.el5_8.src.rpm

i386:
sudo-1.7.2p1-14.el5_8.i386.rpm
sudo-debuginfo-1.7.2p1-14.el5_8.i386.rpm

x86_64:
sudo-1.7.2p1-14.el5_8.x86_64.rpm
sudo-debuginfo-1.7.2p1-14.el5_8.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/sudo-1.7.2p1-14.el5_8.src.rpm

i386:
sudo-1.7.2p1-14.el5_8.i386.rpm
sudo-debuginfo-1.7.2p1-14.el5_8.i386.rpm

ia64:
sudo-1.7.2p1-14.el5_8.ia64.rpm
sudo-debuginfo-1.7.2p1-14.el5_8.ia64.rpm

ppc:
sudo-1.7.2p1-14.el5_8.ppc.rpm
sudo-debuginfo-1.7.2p1-14.el5_8.ppc.rpm

s390x:
sudo-1.7.2p1-14.el5_8.s390x.rpm
sudo-debuginfo-1.7.2p1-14.el5_8.s390x.rpm

x86_64:
sudo-1.7.2p1-14.el5_8.x86_64.rpm
sudo-debuginfo-1.7.2p1-14.el5_8.x86_64.rpm

Red Hat Enterprise Linux Desktop (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/sudo-1.7.4p5-12.el6_3.src.rpm

i386:
sudo-1.7.4p5-12.el6_3.i686.rpm
sudo-debuginfo-1.7.4p5-12.el6_3.i686.rpm

x86_64:
sudo-1.7.4p5-12.el6_3.x86_64.rpm
sudo-debuginfo-1.7.4p5-12.el6_3.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/sudo-1.7.4p5-12.el6_3.src.rpm

x86_64:
sudo-1.7.4p5-12.el6_3.x86_64.rpm
sudo-debuginfo-1.7.4p5-12.el6_3.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/sudo-1.7.4p5-12.el6_3.src.rpm

i386:
sudo-1.7.4p5-12.el6_3.i686.rpm
sudo-debuginfo-1.7.4p5-12.el6_3.i686.rpm

ppc64:
sudo-1.7.4p5-12.el6_3.ppc64.rpm
sudo-debuginfo-1.7.4p5-12.el6_3.ppc64.rpm

s390x:
sudo-1.7.4p5-12.el6_3.s390x.rpm
sudo-debuginfo-1.7.4p5-12.el6_3.s390x.rpm

x86_64:
sudo-1.7.4p5-12.el6_3.x86_64.rpm
sudo-debuginfo-1.7.4p5-12.el6_3.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/sudo-1.7.4p5-12.el6_3.src.rpm

i386:
sudo-1.7.4p5-12.el6_3.i686.rpm
sudo-debuginfo-1.7.4p5-12.el6_3.i686.rpm

x86_64:
sudo-1.7.4p5-12.el6_3.x86_64.rpm
sudo-debuginfo-1.7.4p5-12.el6_3.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-2012-2337.html
https://access.redhat.com/security/updates/classification/#moderate
http://www.sudo.ws/sudo/alerts/netmask.html

8. Contact:

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

Copyright 2012 Red Hat, Inc.
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