A vulnerability in Juniper Networks Junos OS caused by Missing Release of Memory after Effective Lifetime leads to a memory leak each time the CLI command 'show system connections extensive' is executed. The amount of memory leaked on each execution depends on the number of TCP connections from and to the system. Repeated execution will cause more memory to leak and eventually daemons that need to allocate additionally memory and ultimately the kernel to crash, which will result in traffic loss. Continued execution of this command will cause a sustained Denial of Service (DoS) condition. An administrator can use the following CLI command to monitor for increase in memory consumption of the netstat process, if it exists: user@junos> show system processes extensive | match "username|netstat"
The following software releases have been updated to resolve this specific issue: 18.2R2-S8, 18.2R3-S7, 18.3R3-S4, 18.4R1-S8, 18.4R2-S6, 18.4R3-S7, 19.1R1-S6, 19.1R2-S2, 19.1R3-S4, 19.2R1-S6, 19.2R3-S2, 19.3R2-S6, 19.3R3-S1, 19.3R3-S2, 19.4R1-S4, 19.4R2-S3, 19.4R3-S1, 20.1R2, 20.2R2-S1, 20.2R3, 20.3R1-S1, 20.3R2, 20.4R1, and all subsequent releases.
Please use 'show system connections' (without extensive) and restrict access to 'show system connections extensive'. To recover please use: request system process terminate <PID> with the PID for the netstat process from the output of 'show system processes extensive'.
| Product | Vulnerable range | Fixed version | Advisory |
|---|---|---|---|
| Juniper Networks Junos OS | >=18.2<18.2R2-S8, 18.2R3-S7 | 18.2R2-S8, 18.2R3-S7 | advisory ↗ |
| Juniper Networks Junos OS | >=18.3<18.3R3-S4 | 18.3R3-S4 | advisory ↗ |
| Juniper Networks Junos OS | >=18.4<18.4R1-S8, 18.4R2-S6, 18.4R3-S7 | 18.4R1-S8, 18.4R2-S6, 18.4R3-S7 | advisory ↗ |
| Juniper Networks Junos OS | >=19.1<19.1R1-S6, 19.1R2-S2, 19.1R3-S4 | 19.1R1-S6, 19.1R2-S2, 19.1R3-S4 | advisory ↗ |
| Juniper Networks Junos OS | >=19.2<19.2R1-S6, 19.2R3-S2 | 19.2R1-S6, 19.2R3-S2 | advisory ↗ |
| Juniper Networks Junos OS | >=19.3<19.3R2-S6, 19.3R3-S1 | 19.3R2-S6, 19.3R3-S1 | advisory ↗ |
| Juniper Networks Junos OS | >=19.4<19.4R1-S4, 19.4R2-S3, 19.4R3-S1 | 19.4R1-S4, 19.4R2-S3, 19.4R3-S1 | advisory ↗ |
| Juniper Networks Junos OS | >=20.1<20.1R2 | 20.1R2 | advisory ↗ |
| Juniper Networks Junos OS | >=20.2<20.2R2-S1, 20.2R3 | 20.2R2-S1, 20.2R3 | advisory ↗ |
| Juniper Networks Junos OS | >=20.3<20.3R1-S1, 20.3R2 | 20.3R1-S1, 20.3R2 | advisory ↗ |