2025-02: Out-of-Cycle Security Bulletin: Session Smart Router, Session Smart Conductor, WAN Assurance Router: API Authentication Bypass Vulnerability (CVE-2025-21589)

This issue affects Session Smart Router, Session Smart Conductor, WAN Assurance Managed Router. Severity Critical Severity Assessment (CVSS) Score

CVSS: v3.1: 9.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H) SEVERITY:CRITICAL CVSS: v4.0: 9.3 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N) SEVERITY:CRITICAL Problem

An Authentication Bypass Using an Alternate Path or Channel vulnerability in Juniper Networks Session Smart Router may allow a network-based attacker to bypass authentication and take administrative control of the device.

This issue affects Session Smart Router:

from 5.6.7 before 5.6.17, 
from 6.0.8,
from 6.1 before 6.1.12-lts, 
from 6.2 before 6.2.8-lts, 
from 6.3 before 6.3.3-r2;

This issue affects Session Smart Conductor:

from 5.6.7 before 5.6.17, 
from 6.0.8,
from 6.1 before 6.1.12-lts, 
from 6.2 before 6.2.8-lts, 
from 6.3 before 6.3.3-r2;

This issue affects WAN Assurance Managed Routers:

from 5.6.7 before 5.6.17, 
from 6.0.8,
from 6.1 before 6.1.12-lts, 
from 6.2 before 6.2.8-lts, 
from 6.3 before 6.3.3-r2.

Juniper SIRT is not aware of any malicious exploitation of this vulnerability. This issue was found during internal product security testing or research Solution

The following software releases have been updated to resolve this issue:

Session Smart Router: SSR-5.6.17, SSR-6.1.12-lts, SSR-6.2.8-lts, SSR-6.3.3-r2 and subsequent releases.

It is suggested to upgrade all affected systems to one of these versions of software. In a Conductor-managed deployment, it is sufficient to upgrade only the Conductor nodes and the fix will be applied automatically to all connected routers. As practical, the routers should still be upgraded to a fixed version however they will not be vulnerable once they connect to an upgraded Conductor. Router patching can be confirmed once the router reaches the “running" (on 6.2 and earlier) or “synchronized” (on 6.3+) state on the Conductor".

This vulnerability has been patched automatically on devices that operate with WAN Assurance (where configuration is also managed) connected to the Mist Cloud. As practical, the routers should still be upgraded to a version containing the fix.

It is important to note that when the fix is applied automatically on routers managed by a Conductor or on WAN assurance, it will have no impact on data-plane functions of the router. The application of the fix is non-disruptive to production traffic. There may be a momentary downtime (less than 30 seconds) to the web-based management and APIs.

This issue is being tracked as I95-59677.

Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL). Workaround

There are no known workarounds for this issue. Severity Assessment Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories." Modification History

2024-02-11: Initial Publication

Related Information

KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin Publication Process
KB16765: In which releases are vulnerabilities fixed?
KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories
Report a Security Vulnerability - How to Contact the Juniper Networks Security Incident Response Team