A local privilege escalation vulnerability in telnetd.real of Juniper Networks Junos OS may allow a locally authenticated shell user to escalate privileges and execute arbitrary commands as root. telnetd.real is shipped with setuid permissions enabled and is owned by the root user, allowing local users to run telnetd.real with root privileges. This issue affects Juniper Networks Junos OS: all versions prior to 15.1R7-S9; 17.3 versions prior to 17.3R3-S11; 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 18.3R2-S4, 18.3R3-S4; 18.4 versions prior to 18.4R2-S7, 18.4R3-S6; 19.1 versions prior to 19.1R2-S2, 19.1R3-S4; 19.2 versions prior to 19.2R1-S6, 19.2R3-S1; 19.3 versions prior to 19.3R3-S1; 19.4 versio
The following software releases have been updated to resolve this specific issue: Junos OS 15.1R7-S9*, 17.3R3-S11*, 17.4R2-S12, 17.4R3-S3, 18.1R3-S11, 18.2R3-S6, 18.3R2-S4, 18.3R3-S4, 18.4R2-S7, 18.4R3-S6, 19.1R2-S2, 19.1R3-S4, 19.2R1-S6, 19.2R3-S1, 19.3R3-S1, 19.4R2-S2, 19.4R3, 20.1R1-S4, 20.1R2, 20.2R2, 20.3R1, and all subsequent releases. *Late availability
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 shell to only trusted system administrators.
| Product | Vulnerable range | Fixed version | Advisory |
|---|---|---|---|
| Juniper Networks Junos OS | >=unspecified<15.1R7-S9 | 15.1R7-S9 | advisory ↗ |
| Juniper Networks Junos OS | >=17.3<17.3R3-S11 | 17.3R3-S11 | 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<18.3R2-S4, 18.3R3-S4 | 18.3R2-S4, 18.3R3-S4 | advisory ↗ |
| Juniper Networks Junos OS | >=18.4<18.4R2-S7, 18.4R3-S6 | 18.4R2-S7, 18.4R3-S6 | advisory ↗ |
| Juniper Networks Junos OS | >=19.1<19.1R2-S2, 19.1R3-S4 | 19.1R2-S2, 19.1R3-S4 | advisory ↗ |
| Juniper Networks Junos OS | >=19.2<19.2R1-S6, 19.2R3-S1 | 19.2R1-S6, 19.2R3-S1 | advisory ↗ |
| Juniper Networks Junos OS | >=19.3<19.3R3-S1 | 19.3R3-S1 | 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<20.2R2 | 20.2R2 | advisory ↗ |