Junos OS and Junos OS Evolved: The l2cpd will crash when a malformed LLDP packet is received

Summary

An Improper Check or Handling of Exceptional Conditions vulnerability in the Layer-2 control protocols daemon (l2cpd) of Juniper Networks Junos OS and Junos OS Evolved allows an unauthenticated adjacent attacker to cause a Denial of Service (DoS). When a malformed LLDP packet is received, l2cpd will crash and restart. The impact of the l2cpd crash is reinitialization of STP protocols (RSTP, MSTP or VSTP), and MVRP and ERP. Also, if any services depend on LLDP state (like PoE or VoIP device recognition), then these will also be affected. Continued receipt of such packets will lead to a sustained Denial of Service. This issue affects: Juniper Networks Junos OS 21.4 versions prior to 21.4R3-S3; 22.1 versions prior to 22.1R3-S3; 22.2 versions prior to 22.2R2-S1, 22.2R3; 22.3 versions prior to 22.3R2. Juniper Networks Junos OS Evolved 21.4-EVO versions prior to 21.4R3-S2-EVO; 22.1-EVO versions prior to 22.1R3-S3-EVO; 22.2-EVO versions prior to 22.2R2-S1-EVO, 22.2R3-EVO; 22.3-EVO versions prior to 22.3R2-EVO.

Timeline

1. Jul 14, 2023, 5:58 PM UTCCVE published
2. Oct 22, 2024, 2:05 PM UTCCISA SSVC assessment

   Exploitation: none · Automatable: no · Technical impact: partial

3. Oct 22, 2024, 2:18 PM UTCRecord last updated

Affected versions

• Juniper Networks Junos OS

  From 21.4 · fixed in 21.4R3-S3; From 22.1 · fixed in 22.1R3-S3; From 22.3 · fixed in 22.3R2

• Juniper Networks Junos OS Evolved

  From 21.4 · fixed in 21.4R3-S2-EVO; From 22.1 · fixed in 22.1R3-S3-EVO; From 22.3 · fixed in 22.3R2-EVO

References 1