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2020-10 Security Bulletin: Junos OS: Buffer overflow vulnerability in device control daemon (CVE-2020-1664)

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Article ID: JSA11061 SECURITY_ADVISORIES Last Updated: 14 Oct 2020Version: 1.0
Product Affected:
This issue affects Junos OS 17.3, 17.4, 18.1, 18.2, 18.2X75, 18.3, 18.4, 19.1, 19.2, 19.3, 19.4, 20.1, 20.2.
Problem:

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.
 

Solution:

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.
 

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 CLI to only trusted system administrators.
 

Implementation:
Software releases or updates are available for download at https://www.juniper.net/support/downloads/.
 
Modification History:
2020-10-14: Initial Publication

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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