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Category:   Application (Generic)  >   Net-snmp Vendors:   net-snmp.sourceforge.net
(Red Hat Issues Fix) Net-snmp netsnmp_udp_fmtaddr() Lets Remote Users Bypass Access Controls
SecurityTracker Alert ID:  1021923
SecurityTracker URL:  http://securitytracker.com/id/1021923
CVE Reference:   CVE-2008-6123   (Links to External Site)
Date:  Mar 26 2009
Impact:   Disclosure of system information, Disclosure of user information
Fix Available:  Yes  Vendor Confirmed:  Yes  
Version(s): 5.0.9 - 5.4.2
Description:   A vulnerability was reported in Net-snmp. A remote user can bypass access controls to obtain potentially sensitive information.

When TCP wrappers is used for client authentication, the netsnmp_udp_fmtaddr() function in 'snmplib/snmpUDPDomain.c' does not properly parse rules in the 'hosts.allow' file. As a result, a remote user can bypass access rules and obtain potentially sensitive information.

Impact:   A remote user can obtain potentially sensitive information.
Solution:   Red Hat has released a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2009-0295.html

Vendor URL:  www.net-snmp.org/ (Links to External Site)
Cause:   Access control error
Underlying OS:   Linux (Red Hat Enterprise)

Message History:   This archive entry is a follow-up to the message listed below.
Mar 26 2009 Net-snmp netsnmp_udp_fmtaddr() Lets Remote Users Bypass Access Controls



 Source Message Contents

Date:  Thu, 26 Mar 2009 11:48:55 -0400
Subject:  [RHSA-2009:0295-01] Moderate: net-snmp security update


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

Synopsis:          Moderate: net-snmp security update
Advisory ID:       RHSA-2009:0295-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2009-0295.html
Issue date:        2009-03-26
CVE Names:         CVE-2008-6123 
=====================================================================

1. Summary:

Updated net-snmp packages that fix a security issue are now available for
Red Hat Enterprise Linux 3.

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

2. Relevant releases/architectures:

Red Hat Desktop version 3 - i386, x86_64
Red Hat Enterprise Linux AS version 3 - i386, ia64, ppc, s390, s390x, x86_64
Red Hat Enterprise Linux ES version 3 - i386, ia64, x86_64
Red Hat Enterprise Linux WS version 3 - i386, ia64, x86_64

3. Description:

The Simple Network Management Protocol (SNMP) is a protocol used for
network management.

It was discovered that the snmpd daemon did not use TCP wrappers correctly,
causing network hosts access restrictions defined in "/etc/hosts.allow" and
"/etc/hosts.deny" to not be honored. A remote attacker could use this flaw
to bypass intended access restrictions. (CVE-2008-6123)

This issue only affected configurations where hosts.allow and hosts.deny
were used to limit access to the SNMP server. To obtain information from
the server, the attacker would have to successfully authenticate, usually
by providing a correct community string.

All net-snmp users should upgrade to these updated packages, which contain
a backported patch to correct this issue. After installing the update, the
snmpd and snmptrapd daemons will be restarted automatically.

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/):

485211 - CVE-2008-6123 net-snmp: incorrect application of hosts access restrictions in hosts.{allow,deny}

6. Package List:

Red Hat Enterprise Linux AS version 3:

Source:
ftp://updates.redhat.com/enterprise/3AS/en/os/SRPMS/net-snmp-5.0.9-2.30E.27.src.rpm

i386:
net-snmp-5.0.9-2.30E.27.i386.rpm
net-snmp-debuginfo-5.0.9-2.30E.27.i386.rpm
net-snmp-devel-5.0.9-2.30E.27.i386.rpm
net-snmp-libs-5.0.9-2.30E.27.i386.rpm
net-snmp-perl-5.0.9-2.30E.27.i386.rpm
net-snmp-utils-5.0.9-2.30E.27.i386.rpm

ia64:
net-snmp-5.0.9-2.30E.27.ia64.rpm
net-snmp-debuginfo-5.0.9-2.30E.27.i386.rpm
net-snmp-debuginfo-5.0.9-2.30E.27.ia64.rpm
net-snmp-devel-5.0.9-2.30E.27.ia64.rpm
net-snmp-libs-5.0.9-2.30E.27.i386.rpm
net-snmp-libs-5.0.9-2.30E.27.ia64.rpm
net-snmp-perl-5.0.9-2.30E.27.ia64.rpm
net-snmp-utils-5.0.9-2.30E.27.ia64.rpm

ppc:
net-snmp-5.0.9-2.30E.27.ppc.rpm
net-snmp-debuginfo-5.0.9-2.30E.27.ppc.rpm
net-snmp-debuginfo-5.0.9-2.30E.27.ppc64.rpm
net-snmp-devel-5.0.9-2.30E.27.ppc.rpm
net-snmp-libs-5.0.9-2.30E.27.ppc.rpm
net-snmp-libs-5.0.9-2.30E.27.ppc64.rpm
net-snmp-perl-5.0.9-2.30E.27.ppc.rpm
net-snmp-utils-5.0.9-2.30E.27.ppc.rpm

s390:
net-snmp-5.0.9-2.30E.27.s390.rpm
net-snmp-debuginfo-5.0.9-2.30E.27.s390.rpm
net-snmp-devel-5.0.9-2.30E.27.s390.rpm
net-snmp-libs-5.0.9-2.30E.27.s390.rpm
net-snmp-perl-5.0.9-2.30E.27.s390.rpm
net-snmp-utils-5.0.9-2.30E.27.s390.rpm

s390x:
net-snmp-5.0.9-2.30E.27.s390x.rpm
net-snmp-debuginfo-5.0.9-2.30E.27.s390.rpm
net-snmp-debuginfo-5.0.9-2.30E.27.s390x.rpm
net-snmp-devel-5.0.9-2.30E.27.s390x.rpm
net-snmp-libs-5.0.9-2.30E.27.s390.rpm
net-snmp-libs-5.0.9-2.30E.27.s390x.rpm
net-snmp-perl-5.0.9-2.30E.27.s390x.rpm
net-snmp-utils-5.0.9-2.30E.27.s390x.rpm

x86_64:
net-snmp-5.0.9-2.30E.27.x86_64.rpm
net-snmp-debuginfo-5.0.9-2.30E.27.i386.rpm
net-snmp-debuginfo-5.0.9-2.30E.27.x86_64.rpm
net-snmp-devel-5.0.9-2.30E.27.x86_64.rpm
net-snmp-libs-5.0.9-2.30E.27.i386.rpm
net-snmp-libs-5.0.9-2.30E.27.x86_64.rpm
net-snmp-perl-5.0.9-2.30E.27.x86_64.rpm
net-snmp-utils-5.0.9-2.30E.27.x86_64.rpm

Red Hat Desktop version 3:

Source:
ftp://updates.redhat.com/enterprise/3desktop/en/os/SRPMS/net-snmp-5.0.9-2.30E.27.src.rpm

i386:
net-snmp-5.0.9-2.30E.27.i386.rpm
net-snmp-debuginfo-5.0.9-2.30E.27.i386.rpm
net-snmp-devel-5.0.9-2.30E.27.i386.rpm
net-snmp-libs-5.0.9-2.30E.27.i386.rpm
net-snmp-perl-5.0.9-2.30E.27.i386.rpm
net-snmp-utils-5.0.9-2.30E.27.i386.rpm

x86_64:
net-snmp-5.0.9-2.30E.27.x86_64.rpm
net-snmp-debuginfo-5.0.9-2.30E.27.i386.rpm
net-snmp-debuginfo-5.0.9-2.30E.27.x86_64.rpm
net-snmp-devel-5.0.9-2.30E.27.x86_64.rpm
net-snmp-libs-5.0.9-2.30E.27.i386.rpm
net-snmp-libs-5.0.9-2.30E.27.x86_64.rpm
net-snmp-perl-5.0.9-2.30E.27.x86_64.rpm
net-snmp-utils-5.0.9-2.30E.27.x86_64.rpm

Red Hat Enterprise Linux ES version 3:

Source:
ftp://updates.redhat.com/enterprise/3ES/en/os/SRPMS/net-snmp-5.0.9-2.30E.27.src.rpm

i386:
net-snmp-5.0.9-2.30E.27.i386.rpm
net-snmp-debuginfo-5.0.9-2.30E.27.i386.rpm
net-snmp-devel-5.0.9-2.30E.27.i386.rpm
net-snmp-libs-5.0.9-2.30E.27.i386.rpm
net-snmp-perl-5.0.9-2.30E.27.i386.rpm
net-snmp-utils-5.0.9-2.30E.27.i386.rpm

ia64:
net-snmp-5.0.9-2.30E.27.ia64.rpm
net-snmp-debuginfo-5.0.9-2.30E.27.i386.rpm
net-snmp-debuginfo-5.0.9-2.30E.27.ia64.rpm
net-snmp-devel-5.0.9-2.30E.27.ia64.rpm
net-snmp-libs-5.0.9-2.30E.27.i386.rpm
net-snmp-libs-5.0.9-2.30E.27.ia64.rpm
net-snmp-perl-5.0.9-2.30E.27.ia64.rpm
net-snmp-utils-5.0.9-2.30E.27.ia64.rpm

x86_64:
net-snmp-5.0.9-2.30E.27.x86_64.rpm
net-snmp-debuginfo-5.0.9-2.30E.27.i386.rpm
net-snmp-debuginfo-5.0.9-2.30E.27.x86_64.rpm
net-snmp-devel-5.0.9-2.30E.27.x86_64.rpm
net-snmp-libs-5.0.9-2.30E.27.i386.rpm
net-snmp-libs-5.0.9-2.30E.27.x86_64.rpm
net-snmp-perl-5.0.9-2.30E.27.x86_64.rpm
net-snmp-utils-5.0.9-2.30E.27.x86_64.rpm

Red Hat Enterprise Linux WS version 3:

Source:
ftp://updates.redhat.com/enterprise/3WS/en/os/SRPMS/net-snmp-5.0.9-2.30E.27.src.rpm

i386:
net-snmp-5.0.9-2.30E.27.i386.rpm
net-snmp-debuginfo-5.0.9-2.30E.27.i386.rpm
net-snmp-devel-5.0.9-2.30E.27.i386.rpm
net-snmp-libs-5.0.9-2.30E.27.i386.rpm
net-snmp-perl-5.0.9-2.30E.27.i386.rpm
net-snmp-utils-5.0.9-2.30E.27.i386.rpm

ia64:
net-snmp-5.0.9-2.30E.27.ia64.rpm
net-snmp-debuginfo-5.0.9-2.30E.27.i386.rpm
net-snmp-debuginfo-5.0.9-2.30E.27.ia64.rpm
net-snmp-devel-5.0.9-2.30E.27.ia64.rpm
net-snmp-libs-5.0.9-2.30E.27.i386.rpm
net-snmp-libs-5.0.9-2.30E.27.ia64.rpm
net-snmp-perl-5.0.9-2.30E.27.ia64.rpm
net-snmp-utils-5.0.9-2.30E.27.ia64.rpm

x86_64:
net-snmp-5.0.9-2.30E.27.x86_64.rpm
net-snmp-debuginfo-5.0.9-2.30E.27.i386.rpm
net-snmp-debuginfo-5.0.9-2.30E.27.x86_64.rpm
net-snmp-devel-5.0.9-2.30E.27.x86_64.rpm
net-snmp-libs-5.0.9-2.30E.27.i386.rpm
net-snmp-libs-5.0.9-2.30E.27.x86_64.rpm
net-snmp-perl-5.0.9-2.30E.27.x86_64.rpm
net-snmp-utils-5.0.9-2.30E.27.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-2008-6123
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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