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Security Advisory

NET-SNMP - VULNERABILITIES
Published: November 8, 2022
Last Update: November 8, 2022
Summary

A number of Net-SNMP vulnerabilities can impact management plane services on ACOS devices that can cause crashes in SNMP services resulting in potential, transient Denial-of Service (DoS) or other security impacts by malicious SNMP actors. These vulnerabilities are addressed in this document.

Item Score
# Vulnerability ID Source Score Summary
1 CVE-2019-20892 CVSSv3 6.5 Med net-snmp: double free in usm_free_usmStateReference function in snmplib/snmpusm.c via an SNMPv3 GetBulk request
2 CVE-2018-18065 CVSSv3 6.5 Med net-snmp: NULL pointer exception in _set_key in agent/helpers/table_container.c resulting in a denial of service
3 CVE-2018-18066 CVSSv3 7.5 High net-snmp: NULL pointer exception in snmp_oid_compare in snmplib/snmp_api.c resulting in a denial of service
4 CVE-2012-6151 CVSSv2 4.3 Med net-snmp: snmpd crashes/hangs when AgentX subagent times-out
5 CVE-2012-2141 CVSSv2 3.5 Low net-snmp: Array index error, leading to out-of heap-based buffer read (snmpd crash)
Affected Releases

The table below indicates releases of ACOS exposed to this vulnerability and ACOS releases that address them. ACOS release families not indicated below are unaffected by these vulnerabilities.

Customers using affected ACOS releases can overcome vulnerability exposures by updating to the indicated resolved release. If the table does not list a corresponding resolved or unaffected release, then no ACOS release update is currently available.

Releases Affected Releases Resolved or Unaffected
5.0.0 – 5.2.1-P6 5.2.1-P7
5.0.1 TPS – 5.0.2-P2 TPS 5.0.2-P3-TPS
4.1.4-GR1 – 4.1.4-GR1-P11 4.1.4-GR1-P12
3.2.3-P1 – 3.2.5-P6 5.0.2-P3 TPS
Workarounds and Mitigations

None

Software Updates

Software updates that address these vulnerabilities are or will be published at the following URL:
https://support.a10networks.com/

Vulnerability Details

The following table shares brief descriptions for the vulnerabilities addressed in this document.

Vulnerability ID Vulnerability Description
CVE-2019-20892

net-snmp before 5.8.1.pre1 has a double free in usm_free_usmStateReference in snmplib/snmpusm.c via an SNMPv3 GetBulk request. NOTE: this affects net-snmp packages shipped to end users by multiple Linux distributions, but might not affect an upstream release.

CVE-2018-18065

_set_key in agent/helpers/table_container.c in Net-SNMP before 5.8 has a NULL Pointer Exception bug that can be used by an authenticated attacker to remotely cause the instance to crash via a crafted UDP packet, resulting in Denial of Service.

CVE-2018-18066

snmp_oid_compare in snmplib/snmp_api.c in Net-SNMP before 5.8 has a NULL Pointer Exception bug that can be used by an unauthenticated attacker to remotely cause the instance to crash via a crafted UDP packet, resulting in Denial of Service.

CVE-2012-6151

Net-SNMP 5.7.1 and earlier, when AgentX is registering to handle a MIB and processing GETNEXT requests, allows remote attackers to cause a denial of service (crash or infinite loop, CPU consumption, and hang) by causing the AgentX subagent to timeout.

CVE-2012-2141

Array index error in the handle_nsExtendOutput2Table function in agent/mibgroup/agent/extend.c in Net-SNMP 5.7.1 allows remote authenticated users to cause a denial of service (out-of-bounds read and snmpd crash) via an SNMP GET request for an entry not in the extension table.

Acknowledgements

None

Modification History
Revision Date Description
1.0 November 8, 2022

Initial Publication


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