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.

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.

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.

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.

ID	Name	Product	Family	Published	Updated	Severity
73162	CentOS 6 : net-snmp (CESA-2014:0321)	Nessus	CentOS Local Security Checks	3/25/2014	1/4/2021	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
77471	GLSA-201409-02 : Net-SNMP: Denial of Service	Nessus	Gentoo Local Security Checks	9/2/2014	1/6/2021	medium
73172	Oracle Linux 6 : net-snmp (ELSA-2014-0321)	Nessus	Oracle Linux Local Security Checks	3/25/2014	10/22/2024	high
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
73174	RHEL 6 : net-snmp (RHSA-2014:0321)	Nessus	Red Hat Local Security Checks	3/25/2014	1/14/2021	medium

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