CVE-2024-39547 Information

Description

An Improper Handling of Exceptional Conditions vulnerability in the rpd-server of Juniper Networks Junos OS and Junos OS Evolved within cRPD allows an unauthenticated network-based attacker sending crafted TCP traffic to the routing engine (RE) to cause a CPU-based Denial of Service (DoS).

If specially crafted TCP traffic is received by the control plane or a TCP session terminates unexpectedly it will cause increased control plane CPU utilization by the rpd-server process.

While not explicitly required the impact is more severe when RIB sharding is enabled.

Task accounting shows unexpected reads by the RPD Server jobs for shards:

user@junos> show task accounting detail … read:RPD Server.0.0.0.0+780.192.168.0.78+48886 TOT:00000003.00379787 MAX:00000000.00080516 RUNS: 233888
read:RPD Server.0.0.0.0+780.192.168.0.78+49144 TOT:00000004.00007565 MAX:00000000.00080360 RUNS: 233888
read:RPD Server.0.0.0.0+780.192.168.0.78+49694 TOT:00000003.00600584 MAX:00000000.00080463 RUNS: 233888
read:RPD Server.0.0.0.0+780.192.168.0.78+50246 TOT:00000004.00346998 MAX:00000000.00080338 RUNS: 233888\

This issue affects:

Junos OS with cRPD: 

All versions before 21.2R3-S8 
21.4 before 21.4R3-S7 
22.1 before 22.1R3-S6 
22.2 before 22.2R3-S4 
22.3 before 22.3R3-S3 
22.4 before 22.4R3-S2 
23.2 before 23.2R2-S2 
24.2 before 24.2R2; 

Junos OS Evolved with cRPD: 

All versions before 21.4R3-S7-EVO 
22.2 before 22.2R3-S4-EVO 
22.3 before 22.3R3-S3-EVO 
22.4 before 22.4R3-S2-EVO 
23.2 before 23.2R2-EVO.

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Reference

https://supportportal.juniper.net/JSA88108

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

NONE

Availability Impact

NONE

Base Score

HIGH

Base Severity

7.5