Product Affected

This issue affects all versions of Junos OS and Junos OS Evolved
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 Handling of Length Parameter Inconsistency vulnerability in the routing protocol daemon (rpd) of Juniper Networks Junos OS and Junos OS Evolved allows a network based, unauthenticated attacker to cause an RPD crash leading to a Denial of Service (DoS). Continued receipt and processing of this packet will create a sustained Denial of Service (DoS) condition.


Upon receipt of a malformed BGP flowspec update, RPD will crash resulting in a Denial of Service.


This issue affects Juniper Networks Junos OS:

  • All versions prior to 18.1R3-S11;
  • 18.2 versions prior to 18.2R3-S6;
  • 18.3 versions prior to 18.3R3-S4;
  • 18.4 versions prior to 18.4R3-S6;
  • 19.1 versions prior to 19.1R3-S4;
  • 19.2 versions prior to 19.2R3-S1;
  • 19.3 versions prior to 19.3R3-S1;
  • 19.4 versions prior to 19.4R3;
  • 20.1 versions prior to 20.1R2;
  • 20.2 versions prior to 20.2R2;
  • 20.3 versions prior to 20.3R1-S1, 20.3R2;

Juniper Networks Junos OS Evolved:

  • All versions prior to 20.1R3-EVO;
  • 20.2 versions prior to 20.2R2-EVO;
  • 20.3 versions prior to 20.3R2-EVO;


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


This issue was found during internal product security testing or research.


This issue has been assigned CVE-2023-28964.

Solution

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


Junos OS: 18.1R3-S11, 18.2R3-S6, 18.3R3-S4, 18.4R3-S6, 19.1R3-S4, 19.2R3-S1, 19.3R3-S1, 19.4R3, 20.1R2, 20.2R2, 20.3R1-S1, 20.3R2, 20.4R1, and all subsequent releases.

Junos OS Evolved: 20.1R3-EVO, 20.2R2-EVO, 20.3R2-EVO, 20.4R1-EVO, and all subsequent releases.


This issue is being tracked as 1535740


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

Workaround

There are no known workarounds for this issue.

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

  • 2023-04-12: Initial Publication.

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