The usage of an internal HTTP header created an authentication bypass vulnerability (CWE-287), allowing an attacker to view internal files, change settings, manipulate services and execute arbitrary code.

This issue affects all Juniper Networks 128 Technology Session Smart Router versions prior to 4.5.11, and all versions of 5.0 up to and including 5.0.1.

This issue was discovered during external security research.

This issue has been assigned  CVE-2021-31349 .
 

128 Technology has released software updates that address the vulnerability described in this advisory.

Fixed Releases:
The following 128T software patches have been released to resolve this specific issue: 4.5.11, 5.1.0, and all subsequent releases.

Customers who are running 5.0.0 or 5.0.1 should upgrade to 5.1.6 or later.

This issue is being tracked as I95-41227.
 

Instructions for upgrading the 128T Networking Platform can be found at  https://docs.128technology.com/docs/intro_upgrading  .

While no workarounds exist for this vulnerability, risk exposure can be mitigated. HTTP access to the SSR occurs on TCP port 443. It is recommended to install firewall rules to permit access only from trusted IP addresses.
 

2021-10-13: Initial Publication.

• KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin Publication Process [juniper.net]
• KB16765: In which releases are vulnerabilities fixed? [juniper.net]
• KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories [juniper.net]
• Report a Vulnerability - How to Contact the Juniper Networks Security Incident Response Team
• CVE-2021-31349: Session Smart Router: Authentication Bypass Vulnerability
• 128 Technology Session Smart Router vulnerable to authentication bypass (JVN#85073657)

128 Technology was notified via the JVN community of the vulnerability as JVN#85073657.