Juniper Junos OS: 2024-10 Security Bulletin: Junos OS and Junos OS Evolved: cRPD: Receipt of crafted TCP traffic can trigger high CPU utilization (JSA88108) (CVE-2024-39547)

Juniper Junos OS: 2024-10 Security Bulletin: Junos OS and Junos OS Evolved: cRPD: Receipt of crafted TCP traffic can trigger high CPU utilization (JSA88108) (CVE-2024-39547)

Severity

8

CVSS

(AV:N/AC:L/Au:N/C:N/I:N/A:C)

Published

10/09/2024

Created

10/10/2024

Added

10/10/2024

Modified

01/28/2025

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.

Solution(s)

• juniper-junos-os-upgrade-latest

References

• https://attackerkb.com/topics/cve-2024-39547
• CVE - 2024-39547
• JSA88108