An Access of Memory Location After End of Buffer vulnerability in the Layer-2 Control Protocols Daemon (l2cpd) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent, unauthenticated attacker to cause Denial of Service (DoS). On all Junos OS and Junos OS Evolved platforms, when LLDP is enabled on a specific interface, and a malformed LLDP packet is received, l2cpd crashes and restarts. 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. This issue affects: Junos OS: * from 21.4 before 21.4R3-S4, * from 22.1 before 22.1R3-S4, * from 22.2 before 22.2R3-S2, * from 22.3 before 22.3R2-S2, 22.
The following software releases have been updated to resolve this specific issue: Junos OS: 21.4R3-S4, 22.1R3-S4, 22.2R3-S2, 22.3R2-S2, 22.3R3-S1, 22.4R3, 23.2R2, 23.4R1 and all subsequent releases. Junos OS Evolved: 21.4R3-S5-EVO, 22.1R3-S4-EVO, 22.2R3-S2-EVO, 22.3R2-S2-EVO, 22.3R3-S1-EVO, 22.4R3-EVO, 23.2R2-EVO, 23.4R1-EVO and all subsequent releases.
There are no available workarounds for this issue. But if LLDP and its services are not required, customers can disable LLDP.
| Product | Vulnerable range | Fixed version | Advisory |
|---|---|---|---|
| Juniper Networks Junos OS | >=21.4<21.4R3-S4 | 21.4R3-S4 | advisory ↗ |
| Juniper Networks Junos OS | >=22.1<22.1R3-S4 | 22.1R3-S4 | advisory ↗ |
| Juniper Networks Junos OS | >=22.2<22.2R3-S2 | 22.2R3-S2 | advisory ↗ |
| Juniper Networks Junos OS | >=22.3<22.3R2-S2, 22.3R3-S1 | 22.3R2-S2, 22.3R3-S1 | advisory ↗ |
| Juniper Networks Junos OS | >=22.4<22.4R3 | 22.4R3 | advisory ↗ |
| Juniper Networks Junos OS | >=23.2<23.2R2 | 23.2R2 | advisory ↗ |
| Juniper Networks Junos OS Evolved | >=21.4-EVO<21.4R3-S5-EVO | 21.4R3-S5-EVO | advisory ↗ |
| Juniper Networks Junos OS Evolved | >=22.1-EVO<22.1R3-S4-EVO | 22.1R3-S4-EVO | advisory ↗ |
| Juniper Networks Junos OS Evolved | >=22.2-EVO<22.2R3-S2-EVO | 22.2R3-S2-EVO | advisory ↗ |
| Juniper Networks Junos OS Evolved | >=22.3-EVO<22.3R2-S2-EVO, 22.3R3-S1-EVO | 22.3R2-S2-EVO, 22.3R3-S1-EVO | advisory ↗ |
| Juniper Networks Junos OS Evolved | >=22.4-EVO<22.4R3-EVO | 22.4R3-EVO | advisory ↗ |
| Juniper Networks Junos OS Evolved | >=23.2-EVO<23.2R2-EVO | 23.2R2-EVO | advisory ↗ |