CVE-2024-39542: Junos OS and Junos OS Evolved: A malformed CFM packet or specific transit traffic leads to FPC crash
First published: Thu Jul 11 2024(Updated: )
An Improper Validation of Syntactic Correctness of Input vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on MX Series with MPC10/11 or LC9600, MX304, and Junos OS Evolved on ACX Series and PTX Series allows an unauthenticated, network based attacker to cause a Denial-of-Service (DoS). This issue can occur in two scenarios: 1. If a device, which is configured with SFLOW and ECMP, receives specific valid transit traffic, which is subject to sampling, the packetio process crashes, which in turn leads to an evo-aftman crash and causes the FPC to stop working until it is restarted. (This scenario is only applicable to PTX but not to ACX or MX.) 2. If a device receives a malformed CFM packet on an interface configured with CFM, the packetio process crashes, which in turn leads to an evo-aftman crash and causes the FPC to stop working until it is restarted. Please note that the CVSS score is for the formally more severe issue 1. The CVSS score for scenario 2. is: 6.5 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H) This issue affects Junos OS: * All versions before 21.2R3-S4, * 21.4 versions before 21.4R2, * 22.2 versions before 22.2R3-S2; Junos OS Evolved: * All versions before 21.2R3-S8-EVO, * 21.4 versions before 21.4R2-EVO.
Credit: sirt@juniper.net
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Juniper JUNOS | <21.2R3-S4<21.4R2<22.2R3 | |
| Juniper Networks Junos OS | <21.2R3-S8-EVO<21.4R2-EVO |
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Frequently Asked Questions
What is the severity of CVE-2024-39542?
CVE-2024-39542 has been rated as a critical vulnerability due to potential unauthorized access and exploitation possibilities.
How do I fix CVE-2024-39542?
To remediate CVE-2024-39542, users should apply the latest security patches and updates provided by Juniper Networks for affected Junos OS versions.
Which devices are affected by CVE-2024-39542?
CVE-2024-39542 affects multiple devices including MX Series with MPC10/11 or LC9600, MX304, ACX Series, and PTX Series running vulnerable Junos OS versions.
Can CVE-2024-39542 be exploited remotely?
Yes, CVE-2024-39542 can be exploited by unauthenticated network-based attackers, making it critical to address.
What are the impacts of CVE-2024-39542?
Exploitation of CVE-2024-39542 could allow attackers to execute unauthorized commands, potentially compromising the integrity of the network.
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