A denial of service attack vector was discovered on the Linux implementation of the ICMP-MIB. This release fixes this bug and all users are encouraged to update their SNMP agent if they make use of the ICMP-MIB table objects.

Note that Tenable Network Security has extracted the preceding description block directly from the Fedora security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

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

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 buffer overflow flaw was found in the way the decode_icmp_msg() function in the ICMP-MIB implementation processed Internet Control Message Protocol (ICMP) message statistics reported in the /proc/net/snmp file. A remote attacker could send a message for each ICMP message type, which could potentially cause the snmpd service to crash when processing the /proc/net/snmp file. (CVE-2014-2284)

This update also fixes the following bug :

* The snmpd service parses the /proc/diskstats file to track disk usage statistics for UCD-DISKIO-MIB::diskIOTable. On systems with a large number of block devices, /proc/diskstats may be large in size and parsing it can take a non-trivial amount of CPU time. With this update, Net-SNMP introduces a new option, 'diskio', in the /etc/snmp/snmpd.conf file, which can be used to explicitly specify devices that should be monitored. Only these whitelisted devices are then reported in UCD-DISKIO-MIB::diskIOTable, thus speeding up snmpd on systems with numerous block devices. (BZ#990674)

All net-snmp users are advised to upgrade to these updated packages, which contain backported patches to correct these issues. After installing this update, the snmpd service will be restarted automatically.

The remote host is affected by the vulnerability described in GLSA-201409-02 (Net-SNMP: Denial of Service)

    Multiple vulnerabilities have been discovered in Net-SNMP. Please review       the CVE identifiers referenced below for details.
  Impact :

    A remote attacker could create a Denial of Service condition.
  Workaround :

    There is no known workaround at this time.

The remote Oracle Linux 6 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2014-0321 advisory.

    [1:5.5-49.0.1.el6_5.1]
    - snmptrapd: Fix crash due to access of freed memory (John Haxby) [orabug 14404682]

    [1:5.5-49.1]
    - added 'diskio' option to snmpd.conf, it's possible to monitor only selected       devices in diskIOTable (#990674)
    - fixed CVE-2014-2284: denial of service flaw in Linux implementation of       ICMP-MIB (#1073222)

Tenable has extracted the preceding description block directly from the Oracle Linux security advisory.

Note that Nessus has not tested for this issue but has instead relied only on the application's self-reported version number.

The net-snmp remote service received security and bugfixes :

  - A remote denial of service flaw in Linux implementation     of ICMP-MIB has been fixed. (CVE-2014-2284)

  - snmptrapd could have crashed when using a trap with     empty community string. This has been fixed.
    (CVE-2014-2285)

  - The AgentX subagent of net-snmp could have been stalled     when a manager sent a multi-object request with a     different number of subids. (CVE-2014-2310)

A buffer overflow flaw was found in the way the decode_icmp_msg() function in the ICMP-MIB implementation processed Internet Control Message Protocol (ICMP) message statistics reported in the /proc/net/snmp file. A remote attacker could send a message for each ICMP message type, which could potentially cause the snmpd service to crash when processing the /proc/net/snmp file. (CVE-2014-2284)

This update also fixes the following bug :

  - The snmpd service parses the /proc/diskstats file to     track disk usage statistics for     UCD-DISKIO-MIB::diskIOTable. On systems with a large     number of block devices, /proc/diskstats may be large in     size and parsing it can take a non-trivial amount of CPU     time. With this update, Net-SNMP introduces a new     option, 'diskio', in the /etc/snmp/snmpd.conf file,     which can be used to explicitly specify devices that     should be monitored. Only these whitelisted devices are     then reported in UCD-DISKIO- MIB::diskIOTable, thus     speeding up snmpd on systems with numerous block     devices.

After installing this update, the snmpd service will be restarted automatically.

The remote OracleVM system is missing necessary patches to address critical security updates :

  - Add Oracle ACFS to hrStorage (John Haxby) [orabug     18510373]

  - Quicker loading of IP-MIB::ipAddrTable (#1191393)

  - Quicker loading of IP-MIB::ipAddressTable (#1191393)

  - Fixed snmptrapd crash when '-OQ' parameter is used and     invalid trap is received (#CVE-2014-3565)

  - added faster caching into IP-MIB::ipNetToMediaTable     (#789500)

  - fixed compilation with '-Werror=format-security'     (#1181994)

  - added clear error message when port specified in     'clientaddrr' config option cannot be bound (#886468)

  - fixed error check in IP-MIB::ipAddressTable (#1012430)

  - fixed agentx client crash on failed response (#1023570)

  - fixed dashes in net-snmp-config.h (#1034441)

  - fixed crash on monitor trigger (#1050970)

  - fixed 'netsnmp_assert 1 == new_val->high failed' message     in system log (#1065210)

  - fixed parsing of 64bit counters from SMUX subagents     (#1069046)

  - Fixed HOST-RESOURCES-MIB::hrProcessorTable on machines     with >100 CPUs (#1070075)

  - fixed net-snmp-create-v3-user to have the same content     on 32 and 64bit installations (#1073544)

  - fixed IPADDRESS value length in Python bindings     (#1100099)

  - fixed hrStorageTable to contain 31 bits integers     (#1104293)

  - fixed links to developer man pages (#1119567)

  - fixed storageUseNFS functionality in hrStorageTable     (#1125793)

  - fixed netsnmp_set Python bindings call truncating at the     first '\000' character (#1126914)

  - fixed log level of SMUX messages (#1140234)

  - use python/README to net-snmp-python subpackage     (#1157373)

  - fixed forwarding of traps with RequestID=0 in snmptrapd     (#1146948)

  - fixed typos in NET-SNMP-PASS-MIB and SMUX-MIB (#1162040)

  - fixed close overhead of extend commands (#1188295)

  - fixed lmSensorsTable not reporting sensors with     duplicate names (#967871)

  - fixed hrDeviceTable with interfaces with large ifIndex     (#1195547)

  - added 'diskio' option to snmpd.conf, it's possible to     monitor only selected devices in diskIOTable (#990674)

  - fixed CVE-2014-2284: denial of service flaw in Linux     implementation of ICMP-MIB (#1073223)

  - added cache to hrSWRunTable to provide consistent     results (#1007634)

  - skip 'mvfs' (ClearCase) when skipNFSInHostResources is     enabled (#1073237)

  - fixed snmptrapd crashing on forwarding SNMPv3 traps     (#1131844)

  - fixed HOST-RESOURCES-MIB::hrSystemProcesses (#1134335)

  - fixed snmp daemons and utilities crashing in FIPS mode     (#1001830)

  - added support of btrfs filesystem in hrStorageTable     (#1006706)

  - fixed issues found by static analysis tools

  - restored ABI of read_configs_* functions

  - fixed parsing of bulk responses (#983116)

  - added support of vzfs filesystem in hrStorageTable     (#989498)

  - fixed endless loop when parsing sendmail configuration     file with queue groups (#991213)

  - fixed potential memory leak on realloc failure when     processing 'extend' option (#893119)

  - added precise enumeration of configuration files     searched to snmp_config(5) man page (#907571)

  - set permissions of snmpd.conf and snmptrapd conf to 0600     (#919239)

  - fixed kernel threads in hrSWRunTable (#919952)

  - fixed various error codes in Python module (#955771)

  - fixed snmpd crashing in the middle of agentx request     processing when a subagent disconnects (#955511)

  - allow 'includeFile' and 'includeDir' options in     configuration files (#917816)

  - fixed netlink message size (#927474)

  - fixed IF-MIB::ifSpeedHi on systems with non-standard     interface speeds (#947973)

  - fixed BRIDGE-MIB::dot1dBasePortTable not to include the     bridge itself as a port (#960568)

  - fixed snmpd segfault when 'agentaddress' configuration     options is used and too many SIGHUP signals are received     (#968898)

  - updated UCD-SNMP-MIB::dskTable to dynamically add/remove     disks if 'includeAllDisks' is specified in snmpd.conf     (#922691)

  - fixed crash when parsing invalid SNMP packets (#953926)

  - fixed snmpd crashing with 'exec' command with no     arguments in snmpd.conf (#919259)

A buffer overflow flaw was found in the way the decode_icmp_msg() function in the ICMP-MIB implementation processed Internet Control Message Protocol (ICMP) message statistics reported in the /proc/net/snmp file. A remote attacker could send a message for each ICMP message type, which could potentially cause the snmpd service to crash when processing the /proc/net/snmp file. (CVE-2014-2284)

Ken Farnen discovered that Net-SNMP incorrectly handled AgentX timeouts. A remote attacker could use this issue to cause the server to crash or to hang, resulting in a denial of service. (CVE-2012-6151)

It was discovered that the Net-SNMP ICMP-MIB incorrectly validated input. A remote attacker could use this issue to cause the server to crash, resulting in a denial of service. This issue only affected Ubuntu 13.10. (CVE-2014-2284)

Viliam Pucik discovered that the Net-SNMP perl trap handler incorrectly handled NULL arguments. A remote attacker could use this issue to cause the server to crash, resulting in a denial of service.
(CVE-2014-2285)

It was discovered that Net-SNMP incorrectly handled AgentX multi-object requests. A remote attacker could use this issue to cause the server to hang, resulting in a denial of service. This issue only affected Ubuntu 10.04 LTS, Ubuntu 12.04 LTS and Ubuntu 12.10.
(CVE-2014-2310).

Note that Tenable Network Security has extracted the preceding description block directly from the Ubuntu security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.

Updated net-snmp packages fix security vulnerabilities :

Remotely exploitable denial of service vulnerability in Net-SNMP, in the Linux implementation of the ICMP-MIB, making the SNMP agent vulnerable if it is making use of the ICMP-MIB table objects (CVE-2014-2284).

Remotely exploitable denial of service vulnerability in Net-SNMP, in snmptrapd, due to how it handles trap requests with an empty community string when the perl handler is enabled (CVE-2014-2285).

A remote 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).

net-snmp was updated to fix potential remote denial of service problems :

  - fixed a potential remote denial of service problem     within the Linux ICMP-MIB implementation     (CVE-2014-2284)(bnc#866942)

  - fixed a potential remote denial of service problem     inside the snmptrapd Perl trap handler     (CVE-2014-2285)(bnc#866942)

ID	Name	Product	Family	Published	Updated	Severity
72972	Fedora 20 : net-snmp-5.7.2-17.fc20 (2014-3427)	Nessus	Fedora Local Security Checks	3/13/2014	1/11/2021	medium
73174	RHEL 6 : net-snmp (RHSA-2014:0321)	Nessus	Red Hat Local Security Checks	3/25/2014	1/14/2021	medium
77471	GLSA-201409-02 : Net-SNMP: Denial of Service	Nessus	Gentoo Local Security Checks	9/2/2014	1/6/2021	medium
73162	CentOS 6 : net-snmp (CESA-2014:0321)	Nessus	CentOS Local Security Checks	3/25/2014	1/4/2021	medium
73172	Oracle Linux 6 : net-snmp (ELSA-2014-0321)	Nessus	Oracle Linux Local Security Checks	3/25/2014	10/22/2024	high
73511	SuSE 11.3 Security Update : net-snmp (SAT Patch Number 9015)	Nessus	SuSE Local Security Checks	4/15/2014	1/19/2021	medium
72971	Fedora 19 : net-snmp-5.7.2-14.fc19 (2014-3423)	Nessus	Fedora Local Security Checks	3/13/2014	1/11/2021	medium
73177	Scientific Linux Security Update : net-snmp on SL6.x i386/x86_64 (20140324)	Nessus	Scientific Linux Local Security Checks	3/25/2014	1/14/2021	medium
85140	OracleVM 3.3 : net-snmp (OVMSA-2015-0099)	Nessus	OracleVM Local Security Checks	7/31/2015	1/4/2021	medium
73235	Amazon Linux AMI : net-snmp (ALAS-2014-316)	Nessus	Amazon Linux Local Security Checks	3/28/2014	4/18/2018	medium
73513	Ubuntu 10.04 LTS / 12.04 LTS / 12.10 / 13.10 : net-snmp vulnerabilities (USN-2166-1)	Nessus	Ubuntu Local Security Checks	4/15/2014	1/19/2021	medium
82345	Mandriva Linux Security Advisory : net-snmp (MDVSA-2015:092)	Nessus	Mandriva Local Security Checks	3/30/2015	1/14/2021	medium
75300	openSUSE Security Update : net-snmp (openSUSE-SU-2014:0398-1)	Nessus	SuSE Local Security Checks	6/13/2014	1/19/2021	medium

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