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Category:   Application (Generic)  >   Net-snmp Vendors:   net-snmp.sourceforge.net
(Red Hat Issues Fix) Net-snmp SNMP Trap Processing Flaw Lets Remote Users Crash snmptrapd
SecurityTracker Alert ID:  1033035
SecurityTracker URL:  http://securitytracker.com/id/1033035
CVE Reference:   CVE-2014-3565   (Links to External Site)
Date:  Jul 23 2015
Impact:   Denial of service via network
Fix Available:  Yes  Vendor Confirmed:  Yes  

Description:   A vulnerability was reported in Net-snmp. A remote user can cause denial of service conditions.

On systems where snmptrapd is started with the '-OQ' option, a remote user can send a specially crafted SNMP trap where the specified object type does not match the type defined in the MIB to cause the target snmptrapd service to crash.

Impact:   A remote user can cause the target snmptrapd to crash.
Solution:   Red Hat has issued a fix.

The Red Hat advisory is available at:

https://rhn.redhat.com/errata/RHSA-2015-1385.html

Vendor URL:  rhn.redhat.com/errata/RHSA-2015-1385.html (Links to External Site)
Cause:   Access control error
Underlying OS:  Linux (Red Hat Enterprise)
Underlying OS Comments:  6

Message History:   This archive entry is a follow-up to the message listed below.
Sep 2 2014 Net-snmp SNMP Trap Processing Flaw Lets Remote Users Crash snmptrapd



 Source Message Contents

Subject:  [RHSA-2015:1385-01] Moderate: net-snmp security and bug fix update

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

Synopsis:          Moderate: net-snmp security and bug fix update
Advisory ID:       RHSA-2015:1385-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2015-1385.html
Issue date:        2015-07-22
Updated on:        2015-03-02
CVE Names:         CVE-2014-3565 
=====================================================================

1. Summary:

Updated net-snmp packages that fix one security issue and several bugs are
now available for Red Hat Enterprise Linux 6.

Red Hat Product Security 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 Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, x86_64
Red Hat Enterprise Linux HPC Node (v. 6) - x86_64
Red Hat Enterprise Linux HPC Node Optional (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 net-snmp packages provide various libraries and tools for the Simple
Network Management Protocol (SNMP), including an SNMP library, an
extensible agent, tools for requesting or setting information from SNMP
agents, tools for generating and handling SNMP traps, a version of the
netstat command which uses SNMP, and a Tk/Perl Management Information Base
(MIB) browser.

A denial of service flaw was found in the way snmptrapd handled certain
SNMP traps when started with the "-OQ" option. If an attacker sent an SNMP
trap containing a variable with a NULL type where an integer variable type
was expected, it would cause snmptrapd to crash. (CVE-2014-3565)

This update also fixes the following bugs:

* The HOST-RESOURCES-MIB::hrSystemProcesses object was not implemented
because parts of the HOST-RESOURCES-MIB module were rewritten in an earlier
version of net-snmp. Consequently, HOST-RESOURCES-MIB::hrSystemProcesses
did not provide information on the number of currently loaded or running
processes. With this update, HOST-RESOURCES-MIB::hrSystemProcesses has been
implemented, and the net-snmp daemon reports as expected. (BZ#1134335)

* The Net-SNMP agent daemon, snmpd, reloaded the system ARP table every 60
seconds. As a consequence, snmpd could cause a short CPU usage spike on
busy systems with a large APR table. With this update, snmpd does not
reload the full ARP table periodically, but monitors the table changes
using a netlink socket. (BZ#789500)

* Previously, snmpd used an invalid pointer to the current time when
periodically checking certain conditions specified by the "monitor" option
in the /etc/snmpd/snmpd.conf file. Consequently, snmpd terminated
unexpectedly on start with a segmentation fault if a certain entry with the
"monitor" option was used. Now, snmpd initializes the correct pointer
to the current time, and snmpd no longer crashes on start. (BZ#1050970)

* Previously, snmpd expected 8-bit network interface indices when
processing HOST-RESOURCES-MIB::hrDeviceTable. If an interface index of a
local network interface was larger than 30,000 items, snmpd could terminate
unexpectedly due to accessing invalid memory. Now, processing of all
network sizes is enabled, and snmpd no longer crashes in the described
situation. (BZ#1195547)

* The snmpdtrapd service incorrectly checked for errors when forwarding a
trap with a RequestID value of 0, and logged "Forward failed" even though
the trap was successfully forwarded. This update fixes snmptrapd checks and
the aforementioned message is now logged only when appropriate.
(BZ#1146948)

* Previously, snmpd ignored the value of the "storageUseNFS" option in the
/etc/snmpd/snmpd.conf file. As a consequence, NFS drivers were shown as
"Network Disks", even though "storageUseNFS" was set to "2" to report them
as "Fixed Disks" in HOST-RESOURCES-MIB::hrStorageTable. With this update,
snmpd takes the "storageUseNFS" option value into account, and "Fixed
Disks"
NFS drives are reported correctly. (BZ#1125793)

* Previously, the Net-SNMP python binding used an incorrect size (8 bytes
instead of 4) for variables of IPADDRESS type. Consequently, applications
that were using Net-SNMP Python bindings could send malformed SNMP
messages. With this update, the bindings now use 4 bytes for variables with
IPADRESS type, and only valid SNMP messages are sent. (BZ#1100099)

* Previously, the snmpd service did not cut values in
HOST-RESOURCES-MIB::hrStorageTable to signed 32-bit integers, as required
by SNMP standards, and provided the values as unsigned integers. As a
consequence, the HOST-RESOURCES-MIB::hrStorageTable implementation did not
conform to RFC 2790. The values are now cut to 32-bit signed integers, and
snmpd is therefore standard compliant. (BZ#1104293)

Users of net-snmp are advised to upgrade to these updated packages, which
contain backported patches to correct these issues.

4. Solution:

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

For details on how to apply this update, refer to:

https://access.redhat.com/articles/11258

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

886468 - snmpd does not report error when clientaddr <ip>:<port> cannot bind to the specified port
967871 - net-snmp does not display correct lm_sensors sensor data / missing CPU cores
1023570 - libnetsnmpagent.so crash under certain conditions - patched upstream in 2009
1034441 - Net-SNMP libraries and headers are invalid due to hyphens.
1069046 - snmpd returns truncated value for Counter64 taken from smuxpeer
1070075 - SNMP HRPROCESSORLOAD RETURNS INCORRECT VALUES FOR PROCESSOR #'S > 100
1073544 - net-snmp.rpm is not multilib safe
1100099 - net-snmp-python adds zeros to end of IP address (IPADDR type), which is not valid
1119567 - After installation of net-snmp-devel-5.5-44.el6_4.4.x86_64 the command '$ man snmp_read' fails
1125155 - CVE-2014-3565 net-snmp: snmptrapd crash when handling an SNMP trap containing a ifMtu with a NULL type
1125793 - [RHEL6] net-snmp "storageUseNFS 2" option does not report NFS mount as "Fixed Disks"
1126914 - Ocetets Truncated with Python Bindings
1134335 - hrSystemProcesses is missing (net-snmp-5.5-49.el6_5.2)
1157373 - README file in net-snmp-python package is wrong
1181994 - net-snmp package does not compile on Fedora 21
1188295 - net-snmp snmpd fork() overhead [fix available]

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
net-snmp-5.5-54.el6.src.rpm

i386:
net-snmp-5.5-54.el6.i686.rpm
net-snmp-debuginfo-5.5-54.el6.i686.rpm
net-snmp-libs-5.5-54.el6.i686.rpm

x86_64:
net-snmp-5.5-54.el6.x86_64.rpm
net-snmp-debuginfo-5.5-54.el6.i686.rpm
net-snmp-debuginfo-5.5-54.el6.x86_64.rpm
net-snmp-libs-5.5-54.el6.i686.rpm
net-snmp-libs-5.5-54.el6.x86_64.rpm

Red Hat Enterprise Linux Desktop Optional (v. 6):

i386:
net-snmp-debuginfo-5.5-54.el6.i686.rpm
net-snmp-devel-5.5-54.el6.i686.rpm
net-snmp-perl-5.5-54.el6.i686.rpm
net-snmp-python-5.5-54.el6.i686.rpm
net-snmp-utils-5.5-54.el6.i686.rpm

x86_64:
net-snmp-debuginfo-5.5-54.el6.i686.rpm
net-snmp-debuginfo-5.5-54.el6.x86_64.rpm
net-snmp-devel-5.5-54.el6.i686.rpm
net-snmp-devel-5.5-54.el6.x86_64.rpm
net-snmp-perl-5.5-54.el6.x86_64.rpm
net-snmp-python-5.5-54.el6.x86_64.rpm
net-snmp-utils-5.5-54.el6.x86_64.rpm

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

Source:
net-snmp-5.5-54.el6.src.rpm

x86_64:
net-snmp-5.5-54.el6.x86_64.rpm
net-snmp-debuginfo-5.5-54.el6.i686.rpm
net-snmp-debuginfo-5.5-54.el6.x86_64.rpm
net-snmp-libs-5.5-54.el6.i686.rpm
net-snmp-libs-5.5-54.el6.x86_64.rpm
net-snmp-perl-5.5-54.el6.x86_64.rpm
net-snmp-python-5.5-54.el6.x86_64.rpm
net-snmp-utils-5.5-54.el6.x86_64.rpm

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

x86_64:
net-snmp-debuginfo-5.5-54.el6.i686.rpm
net-snmp-debuginfo-5.5-54.el6.x86_64.rpm
net-snmp-devel-5.5-54.el6.i686.rpm
net-snmp-devel-5.5-54.el6.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
net-snmp-5.5-54.el6.src.rpm

i386:
net-snmp-5.5-54.el6.i686.rpm
net-snmp-debuginfo-5.5-54.el6.i686.rpm
net-snmp-devel-5.5-54.el6.i686.rpm
net-snmp-libs-5.5-54.el6.i686.rpm
net-snmp-perl-5.5-54.el6.i686.rpm
net-snmp-python-5.5-54.el6.i686.rpm
net-snmp-utils-5.5-54.el6.i686.rpm

ppc64:
net-snmp-5.5-54.el6.ppc64.rpm
net-snmp-debuginfo-5.5-54.el6.ppc.rpm
net-snmp-debuginfo-5.5-54.el6.ppc64.rpm
net-snmp-devel-5.5-54.el6.ppc.rpm
net-snmp-devel-5.5-54.el6.ppc64.rpm
net-snmp-libs-5.5-54.el6.ppc.rpm
net-snmp-libs-5.5-54.el6.ppc64.rpm
net-snmp-perl-5.5-54.el6.ppc64.rpm
net-snmp-python-5.5-54.el6.ppc64.rpm
net-snmp-utils-5.5-54.el6.ppc64.rpm

s390x:
net-snmp-5.5-54.el6.s390x.rpm
net-snmp-debuginfo-5.5-54.el6.s390.rpm
net-snmp-debuginfo-5.5-54.el6.s390x.rpm
net-snmp-devel-5.5-54.el6.s390.rpm
net-snmp-devel-5.5-54.el6.s390x.rpm
net-snmp-libs-5.5-54.el6.s390.rpm
net-snmp-libs-5.5-54.el6.s390x.rpm
net-snmp-perl-5.5-54.el6.s390x.rpm
net-snmp-python-5.5-54.el6.s390x.rpm
net-snmp-utils-5.5-54.el6.s390x.rpm

x86_64:
net-snmp-5.5-54.el6.x86_64.rpm
net-snmp-debuginfo-5.5-54.el6.i686.rpm
net-snmp-debuginfo-5.5-54.el6.x86_64.rpm
net-snmp-devel-5.5-54.el6.i686.rpm
net-snmp-devel-5.5-54.el6.x86_64.rpm
net-snmp-libs-5.5-54.el6.i686.rpm
net-snmp-libs-5.5-54.el6.x86_64.rpm
net-snmp-perl-5.5-54.el6.x86_64.rpm
net-snmp-python-5.5-54.el6.x86_64.rpm
net-snmp-utils-5.5-54.el6.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
net-snmp-5.5-54.el6.src.rpm

i386:
net-snmp-5.5-54.el6.i686.rpm
net-snmp-debuginfo-5.5-54.el6.i686.rpm
net-snmp-devel-5.5-54.el6.i686.rpm
net-snmp-libs-5.5-54.el6.i686.rpm
net-snmp-perl-5.5-54.el6.i686.rpm
net-snmp-python-5.5-54.el6.i686.rpm
net-snmp-utils-5.5-54.el6.i686.rpm

x86_64:
net-snmp-5.5-54.el6.x86_64.rpm
net-snmp-debuginfo-5.5-54.el6.i686.rpm
net-snmp-debuginfo-5.5-54.el6.x86_64.rpm
net-snmp-devel-5.5-54.el6.i686.rpm
net-snmp-devel-5.5-54.el6.x86_64.rpm
net-snmp-libs-5.5-54.el6.i686.rpm
net-snmp-libs-5.5-54.el6.x86_64.rpm
net-snmp-perl-5.5-54.el6.x86_64.rpm
net-snmp-python-5.5-54.el6.x86_64.rpm
net-snmp-utils-5.5-54.el6.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/

7. References:

https://access.redhat.com/security/cve/CVE-2014-3565
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 2015 Red Hat, Inc.
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