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2022-01 Security Bulletin: Junos OS: Certificate validation is skipped when fetching system scripts from a HTTPS URL (CVE-2022-22156)

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Article ID: JSA11264 SECURITY_ADVISORIES Last Updated: 12 Jan 2022Version: 1.0
Product Affected:
This issue affects Junos OS all versions prior to 18.4R2-S9, 19.1, 19.2, 19.3, 19.4, 20.1, 20.2, 20.3, 20.4, 21.1.
Problem:

An Improper Certificate Validation weakness in the Juniper Networks Junos OS allows an attacker to perform Person-in-the-Middle (PitM) attacks when a system script is fetched from a remote source at a specified HTTPS URL, which may compromise the integrity and confidentiality of the device.

The following command can be executed by an administrator via the CLI to refresh a script from a remote location, which is affected from this vulnerability:

>request system scripts refresh-from (commit | event | extension-service | op | snmp) file filename url <https-url>

This issue affects:

Juniper Networks Junos OS

  • All versions prior to 18.4R2-S9, 18.4R3-S9;
  • 19.1 versions prior to 19.1R2-S3, 19.1R3-S7;
  • 19.2 versions prior to 19.2R1-S7, 19.2R3-S3;
  • 19.3 versions prior to 19.3R3-S4;
  • 19.4 versions prior to 19.4R3-S7;
  • 20.1 versions prior to 20.1R2-S2, 20.1R3;
  • 20.2 versions prior to 20.2R3;
  • 20.3 versions prior to 20.3R2-S1, 20.3R3;
  • 20.4 versions prior to 20.4R2;
  • 21.1 versions prior to 21.1R1-S1, 21.1R2.

The examples of the config stanza affected by this issue:

[event-options event-script file <file-name> source <https-url> refresh]
[system scripts (commit | event | extension-service | op | snmp) file filename refresh-from <https-url>]

Please note that issuing set refresh-from command does not add the refresh-from statement to the configuration but the command behaves like an operational mode command by executing an operation.

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

This issue was seen during production usage.

This issue has been assigned CVE-2022-22156.

Solution:

The following software releases have been updated to resolve this specific issue: 18.4R2-S9, 18.4R3-S9, 19.1R2-S3, 19.1R3-S7, 19.2R1-S7, 19.2R3-S3, 19.3R3-S4, 19.4R3-S7, 20.1R2-S2, 20.1R3, 20.2R3, 20.3R2-S1, 20.3R3, 20.4R2, 21.1R1-S1, 21.1R2, 21.2R1 and all subsequent releases.

This issue is being tracked as 1542229.

Workaround:

There are no viable workarounds for this issue.

Implementation:
Software releases or updates are available for download at https://support.juniper.net/support/downloads/
Modification History:
2022-01-12: Initial Publication.
CVSS Score:
6.5 (CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:H/A:N)
Severity Level:
Medium
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."

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