CVE-2024-39531: Junos OS Evolved: ACX 7000 Series: Protocol specific DDoS configuration affects other protocols
First published: Thu Jul 11 2024(Updated: )
An Improper Handling of Values vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS Evolved on ACX 7000 Series allows a network-based, unauthenticated attacker to cause a Denial-of-Service (DoS). If a value is configured for DDoS bandwidth or burst parameters for any protocol in a queue, all protocols which share the same queue will have their bandwidth or burst value changed to the new value. If, for example, OSPF was configured with a certain bandwidth value, ISIS would also be limited to this value. So inadvertently either the control plane is open for a high level of specific traffic which was supposed to be limited to a lower value, or the limit for a certain protocol is so low that chances to succeed with a volumetric DoS attack are significantly increased. This issue affects Junos OS Evolved on ACX 7000 Series: * All versions before 21.4R3-S7-EVO, * 22.1 versions before 22.1R3-S6-EVO, * 22.2 versions before 22.2R3-S3-EVO, * 22.3 versions before 22.3R3-S3-EVO, * 22.4 versions before 22.4R3-S2-EVO, * 23.2 versions before 23.2R2-EVO, * 23.4 versions before 23.4R1-S1-EVO, 23.4R2-EVO.
Credit: sirt@juniper.net
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Juniper Networks Junos OS | <21.4R3-S7-EVO<22.1R3-S6-EVO<22.2R3-S3-EVO<22.3R3-S3-EVO<22.4R3-S2-EVO<23.2R2-EVO<23.4R1-S1-EVO<23.4R2-EVO |
Remedy
The following software releases have been updated to resolve this specific issue: 21.4R3-S7-EVO, 22.1R3-S6-EVO, 22.2R3-S3-EVO, 22.3R3-S3-EVO, 22.4R3-S2-EVO, 23.2R2-EVO, 23.4R1-S1-EVO, 23.4R2-EVO, 24.2R1-EVO, and all subsequent releases.
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2024-39531?
CVE-2024-39531 has been classified as a Denial-of-Service vulnerability affecting Junos OS Evolved.
How does CVE-2024-39531 affect Juniper Networks devices?
CVE-2024-39531 allows an unauthenticated attacker to cause a Denial-of-Service condition on affected Junos OS Evolved devices.
How do I fix CVE-2024-39531?
To address CVE-2024-39531, update Junos OS Evolved to the recommended secure versions provided by Juniper Networks.
Which versions of Junos OS Evolved are affected by CVE-2024-39531?
Affected versions of Junos OS Evolved include all versions up to 21.4R3-S7-EVO, 22.1R3-S6-EVO, 22.2R3-S3-EVO, 22.3R3-S3-EVO, 22.4R3-S2-EVO, 23.2R2-EVO, and 23.4R1-S1-EVO, as well as 23.4R2.
Is authentication required to exploit CVE-2024-39531?
No, CVE-2024-39531 can be exploited by network-based, unauthenticated attackers.
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