CVE-2024-21597: Junos OS: MX Series: In an AF scenario traffic can bypass configured lo0 firewall filters
First published: Fri Jan 12 2024(Updated: )
An Exposure of Resource to Wrong Sphere vulnerability in the Packet Forwarding Engine (PFE) of Juniper Networks Junos OS on MX Series allows an unauthenticated, network-based attacker to bypass the intended access restrictions. In an Abstracted Fabric (AF) scenario if routing-instances (RI) are configured, specific valid traffic destined to the device can bypass the configured lo0 firewall filters as it's received in the wrong RI context. This issue affects Juniper Networks Junos OS on MX Series: * All versions earlier than 20.4R3-S9; * 21.2 versions earlier than 21.2R3-S3; * 21.4 versions earlier than 21.4R3-S5; * 22.1 versions earlier than 22.1R3; * 22.2 versions earlier than 22.2R3; * 22.3 versions earlier than 22.3R2.
Credit: sirt@juniper.net
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Juniper Junos | =20.4 | |
| Juniper Junos | =20.4-r1 | |
| Juniper Junos | =20.4-r1-s1 | |
| Juniper Junos | =20.4-r2 | |
| Juniper Junos | =20.4-r2-s1 | |
| Juniper Junos | =20.4-r2-s2 | |
| Juniper Junos | =20.4-r3 | |
| Juniper Junos | =20.4-r3-s1 | |
| Juniper Junos | =20.4-r3-s2 | |
| Juniper Junos | =20.4-r3-s3 | |
| Juniper Junos | =20.4-r3-s4 | |
| Juniper Junos | =20.4-r3-s5 | |
| Juniper Junos | =20.4-r3-s6 | |
| Juniper Junos | =20.4-r3-s7 | |
| Juniper Junos | =20.4-r3-s8 | |
| Juniper Junos | =21.2 | |
| Juniper Junos | =21.2-r1 | |
| Juniper Junos | =21.2-r1-s1 | |
| Juniper Junos | =21.2-r1-s2 | |
| Juniper Junos | =21.2-r2 | |
| Juniper Junos | =21.2-r2-s1 | |
| Juniper Junos | =21.2-r2-s2 | |
| Juniper Junos | =21.2-r3 | |
| Juniper Junos | =21.2-r3-s1 | |
| Juniper Junos | =21.2-r3-s2 | |
| Juniper Junos | =21.4 | |
| Juniper Junos | =21.4-r1 | |
| Juniper Junos | =21.4-r1-s1 | |
| Juniper Junos | =21.4-r1-s2 | |
| Juniper Junos | =21.4-r2 | |
| Juniper Junos | =21.4-r2-s1 | |
| Juniper Junos | =21.4-r2-s2 | |
| Juniper Junos | =21.4-r3 | |
| Juniper Junos | =21.4-r3-s1 | |
| Juniper Junos | =21.4-r3-s2 | |
| Juniper Junos | =21.4-r3-s3 | |
| Juniper Junos | =21.4-r3-s4 | |
| Juniper Junos | =22.1 | |
| Juniper Junos | =22.1-r1 | |
| Juniper Junos | =22.1-r1-s1 | |
| Juniper Junos | =22.1-r1-s2 | |
| Juniper Junos | =22.1-r2 | |
| Juniper Junos | =22.1-r2-s1 | |
| Juniper Junos | =22.1-r2-s2 | |
| Juniper Junos | =22.2 | |
| Juniper Junos | =22.2-r1 | |
| Juniper Junos | =22.2-r1-s1 | |
| Juniper Junos | =22.2-r1-s2 | |
| Juniper Junos | =22.2-r2 | |
| Juniper Junos | =22.2-r2-s1 | |
| Juniper Junos | =22.2-r2-s2 | |
| Juniper Junos | =22.3 | |
| Juniper Junos | =22.3-r1 | |
| Juniper Junos | =22.3-r1-s1 | |
| Juniper Junos | =22.3-r1-s2 |
Remedy
The following software releases have been updated to resolve this specific issue: Junos OS 20.4R3-S9, 21.2R3-S3, 21.4R3-S5, 22.1R3, 22.2R3, 22.3R2, 22.4R1, and all subsequent releases.
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2024-21597?
CVE-2024-21597 has a moderate severity level that indicates potential risks for network-based attacks.
How do I fix CVE-2024-21597?
To fix CVE-2024-21597, apply the latest patches provided by Juniper Networks for affected versions of Junos OS.
Which versions of Junos OS are affected by CVE-2024-21597?
CVE-2024-21597 affects Junos OS versions 20.4, 21.2, 21.4, 22.1, 22.2, and 22.3.
What type of vulnerability is CVE-2024-21597?
CVE-2024-21597 is classified as an Exposure of Resource to Wrong Sphere vulnerability.
Can CVE-2024-21597 be exploited remotely?
Yes, CVE-2024-21597 can be exploited by unauthenticated, network-based attackers.
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