CVE-2024-39547: Junos OS and Junos OS Evolved: cRPD: Receipt of crafted TCP traffic can trigger high CPU utilization
First published: Fri Oct 11 2024(Updated: )
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.
Credit: sirt@juniper.net
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Juniper Junos | <21.2R3-S8<21.4R3-S7<22.1R3-S6<22.2R3-S4<22.3R3-S3<22.4R3-S2<23.2R2-S2<24.2R2 | |
| Juniper Networks Junos OS | <21.4R3-S7-EVO<22.2R3-S4-EVO<22.3R3-S3-EVO<22.4R3-S2-EVO<23.2R2-EVO |
Remedy
The following software releases have been updated to resolve this specific issue: Junos OS 21.2R3-S8, 21.4R3-S7, 22.1R3-S6, 22.2R3-S4, 22.3R3-S3, 22.4R3-S2, 23.2R2-S2, 23.4R1, and all subsequent releases. Junos OS Evolved 21.4R3-S7-EVO, 22.2R3-S4-EVO, 22.3R3-S3-EVO, 22.4R3-S2-EVO, 23.2R2-EVO, 23.4R1-EVO, and all subsequent releases.
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2024-39547?
CVE-2024-39547 is classified as a Denial of Service vulnerability due to its ability to cause CPU exhaustion on affected devices.
How does CVE-2024-39547 exploit the system?
CVE-2024-39547 can be exploited by an unauthenticated attacker sending crafted TCP traffic to the routing engine, leading to a denial of service.
Which versions of Junos OS are affected by CVE-2024-39547?
The affected versions include Junos OS versions up to 21.2R3-S8, 21.4R3-S7, and several others through 24.2R2.
How can I fix CVE-2024-39547?
To fix CVE-2024-39547, update your device to a patched version of Junos OS or Junos OS Evolved that is not vulnerable.
Is there a workaround for CVE-2024-39547?
Currently, there are no documented workarounds for CVE-2024-39547, and the recommended action is to apply the security updates.
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