A Race Condition vulnerability in Juniper Networks Junos OS LLDP implementation allows an attacker to cause LLDP to crash leading to a Denial of Service (DoS). This issue occurs when crafted LLDP packets are received by the device from an adjacent device. Multiple LACP flaps will occur after LLDP crashes. An indicator of compromise is to evaluate log file details for lldp with RLIMIT. Intervention should occur before 85% threshold of used KB versus maximum available KB memory is reached. show log messages | match RLIMIT | match lldp | last 20 Matching statement is " /kernel: %KERNEL-[number]: Process ([pid #],lldpd) has exceeded 85% of RLIMIT_DATA: " with [] as variable data to evaluate for. This issue affects: Juniper Networks Junos OS: 12.3 versions prior to 12.3R12-S15; 12.3X48 versions
The following software releases have been updated to resolve this specific issue: 12.3R12-S15, 12.3X48-D95, 15.1R7-S6, 15.1X49-D200, 15.1X53-D593, 16.1R7-S7, 16.1R7-S7, 17.1R2-S11, 17.1R3-S2, 17.2R1-S9, 17.2R3-S3, 17.3R2-S5, 17.3R3-S6, 17.4R2-S4, 17.4R3, 18.1R3-S5, 18.2R2-S7, 18.2R3, 18.2X75-D33, 18.2X75-D50, 18.2X75-D420, 18.3R1-S7, 18.3R2-S3, 18.3R3, 18.4R1-S5, 18.4R2, 19.1R1-S4, 19.1R2, 19.2R1, and all subsequent releases.
Customers may disable LLDP "protocol lldp" or apply firewall filters to block LLDP traffic on ingress interfaces. There are no other known workarounds.
| Product | Vulnerable range | Fixed version | Advisory |
|---|---|---|---|
| Juniper Networks Junos OS | >=12.3<12.3R12-S15 | 12.3R12-S15 | advisory ↗ |
| Juniper Networks Junos OS | >=12.3X48<12.3X48-D95 | 12.3X48-D95 | advisory ↗ |
| Juniper Networks Junos OS | >=15.1<15.1R7-S6 | 15.1R7-S6 | advisory ↗ |
| Juniper Networks Junos OS | >=15.1X49<15.1X49-D200 | 15.1X49-D200 | advisory ↗ |
| Juniper Networks Junos OS | >=15.1X53<15.1X53-D593 | 15.1X53-D593 | advisory ↗ |
| Juniper Networks Junos OS | >=16.1<16.1R7-S7 | 16.1R7-S7 | advisory ↗ |
| Juniper Networks Junos OS | >=17.1<17.1R2-S11, 17.1R3-S2 | 17.1R2-S11, 17.1R3-S2 | advisory ↗ |
| Juniper Networks Junos OS | >=17.2<17.2R1-S9, 17.2R3-S3 | 17.2R1-S9, 17.2R3-S3 | advisory ↗ |
| Juniper Networks Junos OS | >=17.3<17.3R2-S5, 17.3R3-S6 | 17.3R2-S5, 17.3R3-S6 | advisory ↗ |
| Juniper Networks Junos OS | >=17.4<17.4R2-S4, 17.4R3 | 17.4R2-S4, 17.4R3 | advisory ↗ |
| Juniper Networks Junos OS | >=18.1<18.1R3-S5 | 18.1R3-S5 | advisory ↗ |
| Juniper Networks Junos OS | >=18.2<18.2R2-S7, 18.2R3 | 18.2R2-S7, 18.2R3 | advisory ↗ |
| Juniper Networks Junos OS | >=18.2X75<18.2X75-D12, 18.2X75-D33, 18.2X75-D50, 18.2X75-D420 | 18.2X75-D12, 18.2X75-D33, 18.2X75-D50, 18.2X75-D420 | advisory ↗ |
| Juniper Networks Junos OS | >=18.3<18.3R1-S7, 18.3R2-S3, 18.3R3 | 18.3R1-S7, 18.3R2-S3, 18.3R3 | advisory ↗ |
| Juniper Networks Junos OS | >=18.4<18.4R1-S5, 18.4R2 | 18.4R1-S5, 18.4R2 | advisory ↗ |
| Juniper Networks Junos OS | >=19.1<19.1R1-S4, 19.1R2 | 19.1R1-S4, 19.1R2 | advisory ↗ |