Published: November 8, 2022
Last Update: November 8, 2022
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.
|net-snmp: double free in usm_free_usmStateReference function in snmplib/snmpusm.c via an SNMPv3 GetBulk request
|net-snmp: NULL pointer exception in _set_key in agent/helpers/table_container.c resulting in a denial of service
|net-snmp: NULL pointer exception in snmp_oid_compare in snmplib/snmp_api.c resulting in a denial of service
|net-snmp: snmpd crashes/hangs when AgentX subagent times-out
|net-snmp: Array index error, leading to out-of heap-based buffer read (snmpd crash)
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 Resolved or Unaffected
5.0.0 – 5.2.1-P6
5.0.1 TPS – 5.0.2-P2 TPS
4.1.4-GR1 – 4.1.4-GR1-P11
3.2.3-P1 – 3.2.5-P6
Workarounds and Mitigations
The following table shares brief descriptions for the vulnerabilities addressed in this document.
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.
_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.
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.
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.
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.
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