Product Affected

This issue affects Junos OS and Junos OS Evolved.
High
CVSS 3.1: 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
CVSS 4.0: 8.7 (CVSS 4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:L/R:A)

Problem

An Improper Handling of Exceptional Conditions vulnerability in the routing protocol daemon (RPD) of Juniper Networks Junos OS and Junos OS Evolved allows a network based, unauthenticated attacker to cause the RPD process to crash leading to a Denial of Service (DoS).

When a malformed BGP UPDATE packet is received over an established BGP session, RPD crashes and restarts.

Continuous receipt of the malformed BGP UPDATE messages will create a sustained Denial of Service (DoS) condition for impacted devices.

This issue affects eBGP and iBGP, in both IPv4 and IPv6 implementations. This issue requires a remote attacker to have at least one established BGP session.

This issue affects:

Juniper Networks Junos OS:

  • All versions earlier than 20.4R3-S9;
  • 21.2 versions earlier than 21.2R3-S7;
  • 21.3 versions earlier than 21.3R3-S5;
  • 21.4 versions earlier than 21.4R3-S5;
  • 22.1 versions earlier than 22.1R3-S4;
  • 22.2 versions earlier than 22.2R3-S3;
  • 22.3 versions earlier than 22.3R3-S2;
  • 22.4 versions earlier than 22.4R3;
  • 23.2 versions earlier than 23.2R2.

Juniper Networks Junos OS Evolved:
  • All versions earlier than 21.2R3-S7;
  • 21.3-EVO versions earlier than 21.3R3-S5;
  • 21.4-EVO versions earlier than 21.4R3-S8;
  • 22.1-EVO versions earlier than 22.1R3-S4;
  • 22.2-EVO versions earlier than 22.2R3-S3;
  • 22.3-EVO versions earlier than 22.3R3-S2;
  • 22.4-EVO versions earlier than 22.4R3;
  • 23.2-EVO versions earlier than 23.2R2.

Solution

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

Junos OS: 20.4R3-S9, 21.2R3-S7, 21.3R3-S5, 21.4R3-S5, 22.1R3-S4, 22.2R3-S3, 22.3R3-S2, 22.4R3, 23.2R2, 23.4R1, and all subsequent releases.

Junos OS Evolved: 21.2R3-S7-EVO, 21.3R3-S5-EVO, 21.4R3-S8-EVO, 22.1R3-S4-EVO, 22.2R3-S3-EVO, 22.3R3-S2-EVO, 22.4R3-EVO, 23.2R2-EVO, 23.4R1-EVO, and all subsequent releases.

 

This issue is being tracked as 1755287 which is visible on the Customer Support website.

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

2024-07-10: Initial Publication

Related Information

Acknowledgements

Juniper SIRT would like to acknowledge and thank Matteo Memelli ([email protected]) from Amazon for responsibly reporting this vulnerability.