An Information Exposure vulnerability in J-Web of Juniper Networks Junos OS allows an unauthenticated attacker to elevate their privileges over the target system through opportunistic use of an authenticated users session.

This issue affects:

Juniper Networks Junos OS

• 12.3 versions prior to 12.3R12-S17;
• 17.3 versions prior to 17.3R3-S10;
• 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-S5, 18.4R3-S5;
• 19.1 versions prior to 19.1R1-S6, 19.1R2-S2, 19.1R3-S3;
• 19.2 versions prior to 19.2R1-S5, 19.2R3, 19.2R3-S1;
• 19.3 versions prior to 19.3R2-S4, 19.3R3;
• 19.4 versions prior to 19.4R1-S3, 19.4R2-S2, 19.4R3;
• 20.1 versions prior to 20.1R1-S4, 20.1R2;
• 20.2 versions prior to 20.2R1-S1, 20.2R2.

The following minimal configuration is required:

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

This issue was discovered during a external security research.

This issue has been assigned  CVE-2021-0210 .

The following software releases have been updated to resolve this specific issue: 12.3R12-S17, 15.1R7-S8, 17.3R3-S10, 17.4R2-S12, 17.4R3-S3, 18.1R3-S11, 18.2R3-S6, 18.3R2-S4, 18.3R3-S4, 18.4R2-S5, 18.4R3-S5, 19.1R1-S6, 19.1R2-S2, 19.1R3-S3, 19.2R1-S5, 19.2R3, 19.2R3-S1, 19.3R2-S4, 19.3R3, 19.4R1-S3, 19.4R2-S2, 19.4R3, 20.1R1-S4, 20.1R2, 20.2R1-S1, 20.2R2, 20.3R1, and all subsequent releases.

This issue is being tracked as  1518212 .

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

There are no known workarounds for this issue.
 

• 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 Security Vulnerability - How to Contact the Juniper Networks Security Incident Response Team
• CVE-XXXX-XXXX at cve.mitre.org

Lena David and Geoffrey Bertoli of Synacktiv (https://synacktiv.com)