Junos OS and Junos OS Evolved: An IS-IS adjacency might be taken down if a bad hello PDU is received for an existing adjacency causing a DoS

Summary

A Protection Mechanism Failure vulnerability in RPD (routing protocol daemon) of Juniper Networks Junos OS and Junos OS Evolved allows an adjacent unauthenticated attacker to cause established IS-IS adjacencies to go down by sending a spoofed hello PDU leading to a Denial of Service (DoS) condition. Continued receipted of these spoofed PDUs will create a sustained Denial of Service (DoS) condition. This issue affects: Juniper Networks Junos OS All versions prior to 18.2R3-S8; 18.3 versions prior to 18.3R3-S5; 18.4 versions prior to 18.4R3-S9; 19.1 versions prior to 19.1R3-S7; 19.2 versions prior to 19.2R1-S7, 19.2R3-S3; 19.3 versions prior to 19.3R2-S6, 19.3R3-S2; 19.4 versions prior to 19.4R3-S3; 20.1 versions prior to 20.1R3; 20.2 versions prior to 20.2R3; 20.3 versions prior to 20.3R3; 20.4 versions prior to 20.4R2. Juniper Networks Junos OS Evolved All versions prior to 20.4R2-EVO; 21.1 versions prior to 21.1R2-EVO.

Timeline

1. Oct 19, 2021, 6:16 PM UTCCVE published
2. Sep 17, 2024, 12:15 AM UTCRecord last updated

Affected versions

• Juniper Networks Junos OS

  fixed in 18.2R3-S8; From 18.3 · fixed in 18.3R3-S5; From 18.4 · fixed in 18.4R3-S9; From 19.1 · fixed in 19.1R3-S7; From 19.4 · fixed in 19.4R3-S3; From 20.1 · fixed in 20.1R3; From 20.2 · fixed in 20.2R3; From 20.3 · fixed in 20.3R3; From 20.4 · fixed in 20.4R2

• Juniper Networks Junos OS Evolved

  fixed in 20.4R2-EVO; From 21.1 · fixed in 21.1R2-EVO

References 1