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2021-04 Security Bulletin: Junos OS: NFX Series: Local Code Execution Vulnerability in JDMD Leads to Privilege Escalation (CVE-2021-0252)

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Article ID: JSA11145 SECURITY_ADVISORIES Last Updated: 14 Apr 2021Version: 2.0
Product Affected:
This issue affects Junos OS 18.1, 18.2, 18.3, 18.4, 19.1, 19.2. Affected platforms: NFX Series.
Problem:

NFX Series devices using Juniper Networks Junos OS are susceptible to a local code execution vulnerability thereby allowing an attacker to elevate their privileges via the Junos Device Management Daemon (JDMD) process.

This issue affects Juniper Networks Junos OS on NFX Series:

  • 18.1 version 18.1R1 and later versions prior to 18.2R3-S5;
  • 18.3 versions prior to 18.3R2-S4, 18.3R3-S3;
  • 18.4 versions prior to 18.4R2-S5, 18.4R3-S4;
  • 19.1 versions prior to 19.1R1-S3, 19.1R2;
  • 19.2 versions prior to 19.2R1-S5, 19.2R2.
  • This issue does not affect Juniper Networks Junos OS versions prior to 18.1R1.

This issue does not affect the JDMD as used by Junos Node Slicing such as External Servers use in conjunction with Junos Node Slicing and In-Chassis Junos Node Slicing on MX480, MX960, MX2008, MX2010, MX2020.

There is no specific software configuration required to be affected by this issue on affected platforms and products.

Juniper SIRT is not aware of any malicious exploitation of these vulnerabilities.

This issue was discovered during a external security research.

This issue has been assigned CVE-2021-0252.

Solution:

The following software releases have been updated to resolve this specific issue: Junos OS: 18.2R3-S5, 18.3R2-S4, 18.3R3-S3, 18.4R2-S5, 18.4R3-S4, 19.1R1-S3, 19.1R2, 19.2R1-S5, 19.2R2, 19.3R1 and all subsequent releases.

This issue is being tracked as 1452147.

Workaround:

There are no viable workarounds for these issue.

To reduce the risk of exploitation of this issue, use access lists or firewall filters to limit access to only trusted administrative networks, hosts and users

Implementation:
Software releases or updates are available for download at https://support.juniper.net/support/downloads/
Modification History:
2021-04-14: 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:
  • Loic RESTOUX from Orange group

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