An Improper Input Validation vulnerability in J-Web of Juniper Networks Junos OS allows a locally authenticated attacker to escalate their privileges to root over the target device. junos:18.3R3-S5 junos:18.4R3-S9 junos:19.1R3-S6 junos:19.3R2-S6 junos:19.3R3-S3 junos:19.4R1-S4 junos:19.4R3-S4 junos:20.1R2-S2 junos:20.1R3 junos:20.2R3-S1 junos:20.3X75-D20 junos:20.3X75-D30 junos:20.4R2-S1 junos:20.4R3 junos:21.1R1-S1 junos:21.1R2 junos:21.2R1 junos:21.3R1 This issue affects: Juniper Networks Junos OS 19.3 versions 19.3R1 and above prior to 19.3R2-S6, 19.3R3-S3; 19.4 versions prior to 19.4R3-S5; 20.1 versions prior to 20.1R2-S2, 20.1R3-S1; 20.2 versions prior to 20.2R3-S2; 20.3 versions prior to 20.3R3; 20.4 versions prior to 20.4R2-S1, 20.4R3; 21.1 versions prior to 21.1R1-S1, 21.1R2. This
The following software releases have been updated to resolve this specific issue: 19.3R2-S6, 19.3R3-S3, 19.4R3-S5, 20.1R2-S2, 20.1R3-S1, 20.2R3-S2, 20.3R3, 20.4R2-S1, 20.4R3, 21.1R1-S1, 21.1R2, 21.2R1, and all subsequent releases. In addition to the above fixed releases, for the following not-affected releases additional security enhancements were included in Junos OS 18.3R3-S5, 18.4R3-S9, 19.1R3-S6 as a result of resolving this issue.
There are no viable workarounds for this issue other than disabling J-Web. To reduce the risk of exploitation of these issues, use access lists or firewall filters to limit access to only trusted administrative networks, hosts and users.
| Product | Vulnerable range | Fixed version | Advisory |
|---|---|---|---|
| Juniper Networks Junos OS | >=19.3R1<19.3* | 19.3* | advisory ↗ |
| Juniper Networks Junos OS | >=19.4<19.4R3-S5 | 19.4R3-S5 | advisory ↗ |
| Juniper Networks Junos OS | >=20.1<20.1R2-S2, 20.1R3-S1 | 20.1R2-S2, 20.1R3-S1 | advisory ↗ |
| Juniper Networks Junos OS | >=20.2<20.2R3-S2 | 20.2R3-S2 | advisory ↗ |
| Juniper Networks Junos OS | >=20.3<20.3R3 | 20.3R3 | advisory ↗ |
| Juniper Networks Junos OS | >=20.4<20.4R2-S1, 20.4R3 | 20.4R2-S1, 20.4R3 | advisory ↗ |
| Juniper Networks Junos OS | >=21.1<21.1R1-S1, 21.1R2 | 21.1R1-S1, 21.1R2 | advisory ↗ |