Product Affected

This issue affects Junos OS 21.1, 21.2, 21.3, 21.4, 22.1, 22.2. This issue affects Junos OS Evolved 21.4-EVO, 22.1-EVO, 22.2-EVO.
High
7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Problem

An Improper Check for Unusual or Exceptional Conditions vulnerability in BGP route processing of Juniper Networks Junos OS and Junos OS Evolved allows an attacker to cause Routing Protocol Daemon (RPD) crash by sending a BGP route with invalid next-hop resulting in a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition.
 

This issue only affects systems without import policy configured.
 

This issue affects:

Juniper Networks Junos OS

  • 21.1 versions prior to 21.1R3-S4;
  • 21.2 versions prior to 21.2R3-S3;
  • 21.3 versions prior to 21.3R3-S2;
  • 21.4 versions prior to 21.4R2-S2, 21.4R3;
  • 22.1 versions prior to 22.1R1-S2, 22.1R2;
  • 22.2 versions prior to 22.2R1-S1, 22.2R2.


Juniper Networks Junos OS Evolved

  • 21.4-EVO versions prior to 21.4R2-S2-EVO, 21.4R3-EVO;
  • 22.1-EVO versions prior to 22.1R1-S2-EVO, 22.1R2-EVO;
  • 22.2-EVO versions prior to 22.2R1-S1-EVO, 22.2R2-EVO.


This issue does not affect:

  • Juniper Networks Junos OS versions prior to 21.1R1.
  • Juniper Networks Junos OS Evolved versions prior to 21.3R1-EVO.


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-2023-22393.

Solution

The following software releases have been updated to resolve this specific issue:

Junos OS : 21.1R3-S4, 21.2R3-S3, 21.3R3-S2, 21.4R2-S2, 21.4R3, 22.1R1-S2, 22.1R2, 22.2R1-S1, 22.2R2, 22.3R1, and all subsequent releases.

Junos OS Evolved : 21.4R2-S2-EVO, 21.4R3-EVO, 22.1R1-S2-EVO, 22.1R2-EVO, 22.2R1-S1-EVO, 22.2R2-EVO, 22.3R1-EVO, and all subsequent releases.


This issue is being tracked as 1679539.


Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of Engineering (EOE) or End of Life (EOL).

Workaround

Ensure every BGP session has an import policy configured.

Severity Assessment

Information for how Juniper Networks uses CVSS can be found at KB 16446 [juniper.net] "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."

Modification History

  • 2023-01-11: Initial Publication

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