A stack buffer overflow vulnerability in the device control daemon (DCD) on Juniper Networks Junos OS allows a low privilege local user to create a Denial of Service (DoS) against the daemon or execute arbitrary code in the system with root privilege.

This issue affects Juniper Networks Junos OS:

• 17.3 versions prior to 17.3R3-S9;
• 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;
• 18.2X75 versions prior to 18.2X75-D53, 18.2X75-D65;
• 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 19.1R3-S3;
• 19.2 versions prior to 19.2R1-S5, 19.2R3;
• 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.

Versions of Junos OS prior to 17.3 are unaffected by this vulnerability.

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

This issue was discovered during external security research.

This issue has been assigned  CVE-2020-1664 .
 

The following software releases have been updated to resolve this specific issue: Junos OS 17.3R3-S9, 17.4R2-S12, 17.4R3-S3, 18.1R3-S11, 18.2R3-S6, 18.2X75-D53, 18.2X75-D65, 18.3R2-S4, 18.3R3-S4, 18.4R2-S5, 18.4R3-S5, 19.1R3-S3, 19.2R1-S5, 19.2R3, 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  1519334 .
 

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

Use access lists or firewall filters to limit CLI access to the device only from trusted, administrative networks or hosts.

Limit access to the Junos OS CLI to only trusted system administrators.
 

2020-10-14: 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-2020-1664 at cve.mitre.org

Juniper SIRT would like to acknowledge and thank Hoàng Thạch Nguyễn (d4rkn3ss) of STAR Labs for responsibly reporting this vulnerability.