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2021-01 Security Bulletin: Junos OS: Multiple Local Privilege Escalation vulnerabilities in SUID binaries

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Article ID: JSA11114 SECURITY_ADVISORIES Last Updated: 14 Jan 2021Version: 3.0
Product Affected:
This issue affects all versions of Junos OS.
Problem:

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:

CVE CVSS Summary
CVE-2021-0223 7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) Junos OS: telnetd.real Local Privilege Escalation vulnerabilities in SUID binaries
CVE-2021-0204 7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H) Junos OS: dexp Local Privilege Escalation vulnerabilities in SUID binaries

 
Solution:

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

Workaround:

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.
 

Implementation:
Software releases or updates are available for download at https://www.juniper.net/support/downloads/.
 
Modification History:
2021-01-13: Initial Publication.
2021-01-14: Added 15.1R7-S9 (late availability).


CVSS Score:
7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
Severity Level:
High
Severity Assessment:
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."
Acknowledgements:
Juniper SIRT would like to acknowledge and thank Hoàng Thạch Nguyễn (d4rkn3ss) of STAR Labs for responsibly reporting this vulnerability.
 

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