Multiple local privilege escalation vulnerabilities in Juniper Networks Junos OS have been reported due to the setuid bit being enabled on multiple binaries. These binaries will run as the owner of the executable (typically “root”) and inherit their privileges. Hence these binary files can be used to escalate privileges to disclose sensitive information or execute arbitrary command as root.

This issue affects Juniper Networks Junos OS:

• all versions prior to 15.1R7-S9;
• 17.3 versions prior to 17.3R3-S11;
• 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 18.3R3-S4;
• 18.4 versions prior to 18.4R2-S7, 18.4R3-S6;
• 19.1 versions prior to 19.1R2-S2, 19.1R3-S4;
• 19.2 versions prior to 19.2R1-S6, 19.2R3-S1;
• 19.3 versions prior to 19.3R3-S1;
• 19.4 versions prior to 19.4R2-S2, 19.4R3-S1;
• 20.1 versions prior to 20.1R1-S4, 20.1R2;
• 20.2 versions prior to 20.2R2.

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

This issue was discovered during a external security research.

The following vulnerabilities have been resolved in the releases listed below:

The following software releases have been updated to resolve these specific issues: Junos OS 15.1R7-S9*, 17.3R3-S11*, 17.4R2-S12, 17.4R3-S3, 18.1R3-S11, 18.2R3-S6, 18.3R3-S4, 18.4R2-S7, 18.4R3-S6, 19.1R2-S2, 19.1R3-S4, 19.2R1-S6, 19.2R3-S1, 19.3R3-S1, 19.4R2-S2, 19.4R3-S1, 20.1R1-S4, 20.1R2, 20.2R2, 20.3R1, and all subsequent releases.

This issue is being tracked as  1525318  and  1529210 .

*Late availability

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 shell to only trusted system administrators.
 

2021-01-13: Initial Publication.
2021-01-14: Added 15.1R7-S9 (late availability).

• 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-2021-0223 at cve.mitre.org
• CVE-2021-0204 at cve.mitre.org

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