A stack-based Buffer Overflow vulnerability in Juniper Networks SBR Carrier with EAP (Extensible Authentication Protocol) authentication configured, allows an attacker sending specific packets causing the radius daemon to crash resulting with a Denial of Service (DoS) or leading to remote code execution (RCE). By continuously sending this specific packets, an attacker can repeatedly crash the radius daemon, causing a sustained Denial of Service (DoS).

This issue affects Juniper Networks SBR Carrier:

• 8.4.1 versions prior to 8.4.1R19;
• 8.5.0 versions prior to 8.5.0R10;
• 8.6.0 versions prior to 8.6.0R4.

This issue affects SBR Carrier with EAP authentication configured only when using Enhanced EAP Logging and TraceLevel setting of 2.

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was seen during production usage.

This issue has been assigned CVE-2021-0276 .

The following software releases have been updated to resolve this specific issue: 8.4.1R19, 8.5.0R10, 8.6.0R4 and all subsequent releases.

This issue is being tracked as 1465201 .

Software releases or updates are available for download at https://support.juniper.net/support/downloads/
 

There are no viable workarounds for this issue.

2021-07-14: 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-2021-0276: Remote code execution vulnerability when EAP Authentication is configured.