A command injection vulnerability in the license-check daemon of Juniper Networks Junos OS that may allow a locally authenticated attacker with low privileges to execute commands with root privilege. license-check is a daemon used to manage licenses in Junos OS. To update licenses, a user executes the command 'request system license update' via the CLI. An attacker with access to this CLI command may be able to exploit the vulnerability. This issue affects Juniper Networks Junos OS: 17.3 versions prior to 17.3R3-S9; 17.4 versions prior to 17.4R2-S12, 17.4R3-S3; 18.1 versions prior to 18.1R3-S11; 18.2 versions prior to 18.2R3-S6; 18.3 versions prior to 18.3R3-S4; 18.4 versions prior to 18.4R3-S6; 19.1 versions prior to 19.1R1-S6, 19.1R2-S2, 19.1R3-S3; 19.2 versions prior to 19.2R3-S1; 19.3
The following software releases have been updated to resolve this specific issue: Junos OS 17.3R3-S9, 17.4R2-S12, 17.4R3-S3, 18.1R3-S11, 18.2R3-S6, 18.3R3-S4, 18.4R3-S6, 19.1R1-S6, 19.1R2-S2, 19.1R3-S3, 19.2R3-S1, 19.3R2-S5, 19.3R3, 19.4R2-S2, 19.4R3, 20.1R1-S4, 20.1R2, 20.2R1-S2, 20.2R2, 20.3R1, and all subsequent releases.
Use access lists or firewall filters to limit CLI access to the device only from trusted, administrative networks or hosts. Limit access to the Junos OS CLI to only trusted system administrators. Restrict access to the 'request system license update' CLI command.
| Product | Vulnerable range | Fixed version | Advisory |
|---|---|---|---|
| Juniper Networks Junos OS | >=17.3<17.3R3-S9 | 17.3R3-S9 | advisory ↗ |
| Juniper Networks Junos OS | >=17.4<17.4R2-S12, 17.4R3-S3 | 17.4R2-S12, 17.4R3-S3 | advisory ↗ |
| Juniper Networks Junos OS | >=18.1<18.1R3-S11 | 18.1R3-S11 | advisory ↗ |
| Juniper Networks Junos OS | >=18.2<18.2R3-S6 | 18.2R3-S6 | advisory ↗ |
| Juniper Networks Junos OS | >=18.3<18.3R3-S4 | 18.3R3-S4 | advisory ↗ |
| Juniper Networks Junos OS | >=18.4<18.4R3-S6 | 18.4R3-S6 | advisory ↗ |
| Juniper Networks Junos OS | >=19.1<19.1R1-S6, 19.1R2-S2, 19.1R3-S3 | 19.1R1-S6, 19.1R2-S2, 19.1R3-S3 | advisory ↗ |
| Juniper Networks Junos OS | >=19.2<19.2R3-S1 | 19.2R3-S1 | advisory ↗ |
| Juniper Networks Junos OS | >=19.3<19.3R2-S5, 19.3R3 | 19.3R2-S5, 19.3R3 | advisory ↗ |
| Juniper Networks Junos OS | >=19.4<19.4R2-S2, 19.4R3 | 19.4R2-S2, 19.4R3 | advisory ↗ |
| Juniper Networks Junos OS | >=20.1<20.1R1-S4, 20.1R2 | 20.1R1-S4, 20.1R2 | advisory ↗ |
| Juniper Networks Junos OS | >=20.2<20.2R1-S2, 20.2R2 | 20.2R1-S2, 20.2R2 | advisory ↗ |