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2021-10 Security Bulletin: Junos OS: Receipt of a specific BGP update may cause RPKI policy-checks to be bypassed (CVE-2021-31375)

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Article ID: JSA11240 SECURITY_ADVISORIES Last Updated: 13 Oct 2021Version: 2.0
Product Affected:
This issue affects Junos OS 12.3, 15.1, 17.2, 17.3, 17.4, 18.1, 18.2, 18.3, 18.4, 19.1, 19.2, 19.3.
Problem:

An Improper Input Validation vulnerability in routing process daemon (RPD) of Juniper Networks Junos OS devices configured with BGP origin validation using Resource Public Key Infrastructure (RPKI), allows an attacker to send a specific BGP update which may cause RPKI policy-checks to be bypassed. This, in turn, may allow a spoofed advertisement to be accepted or propagated.

This issue affects:

Juniper Networks Junos OS:

  • 12.3 versions prior to 12.3R12-S18;
  • 15.1 versions prior to 15.1R7-S9;
  • 17.2 versions prior to 17.2R3-S3;
  • 17.3 versions prior to 17.3R3-S7;
  • 17.4 versions prior to 17.4R2-S9, 17.4R3;
  • 18.1 versions prior to 18.1R3-S13;
  • 18.2 versions prior to 18.2R3-S3;
  • 18.3 versions prior to 18.3R3-S1;
  • 18.4 versions prior to 18.4R3;
  • 19.1 versions prior to 19.1R2;
  • 19.2 versions prior to 19.2R2;
  • 19.3 versions prior to 19.3R2.

The following minimal configuration is necessary:

* Must be running Junos OS.

* A BGP peering session is established.

* BGP Origin Validation is configured with RPKI.

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-2021-31375.

Solution:

The following software releases have been updated to resolve this specific issue: 12.3R12-S18, 15.1R7-S9, 17.2R3-S3, 17.3R3-S7, 17.4R2-S9, 17.4R3, 18.1R3-S13, 18.2R3-S3, 18.3R3-S1, 18.4R3, 19.1R2, 19.2R2, 19.3R2, 19.4R1, and all subsequent releases.

This issue is being tracked as 1463306.

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:
2021-10-13: Initial Publication.
CVSS Score:
7.2 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L)
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."

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