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AUSCERT External Security Bulletin Redistribution
ESB-2024.2218
2024-04 Security Bulletin: Junos OS: SRX 300 Series: Specific link local
traffic causes a control plane overload (CVE-2024-21605)
11 April 2024
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AusCERT Security Bulletin Summary
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Product: Junos OS
Publisher: Juniper Networks
Operating System: Juniper
Resolution: Patch/Upgrade
CVE Names: CVE-2024-21605
Original Bulletin:
https://supportportal.juniper.net/s/article/2024-04-Security-Bulletin-Junos-OS-SRX-300-Series-Specific-link-local-traffic-causes-a-control-plane-overload-CVE-2024-21605
Comment: CVSS (Max): 6.5 CVE-2024-21605 (CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)
CVSS Source: Juniper Networks
Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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Article ID: JSA75746
Product Affected: This issue affects Junos OS 21.2R3-S3, 22.1R3, 22.2R2,
22.3R2, 22.4, 23.2. Affected platforms: SRX 300 Series.
Severity Level: Medium
CVSS Score: CVSS 3.1
Problem:
An Exposure of Resource to Wrong Sphere vulnerability in the Packet Forwarding
Engine (PFE) of Juniper Networks Junos OS on SRX 300 Series allows an
unauthenticated, adjacent attacker to cause a Denial of Service (DoS).
Specific valid link-local traffic is not blocked on ports in STP blocked state
but is instead sent to the control plane of the device. This leads to excessive
resource consumption and in turn severe impact on all control and management
protocols of the device.
This issue affects Juniper Networks Junos OS:
o 21.2 version 21.2R3-S3 and later versions earlier than 21.2R3-S6;
o 22.1 version 22.1R3 and later versions earlier than 22.1R3-S4;
o 22.2 version 22.2R2 and later versions earlier than 22.2R3-S2;
o 22.3 version 22.3R2 and later versions earlier than 22.3R3-S1;
o 22.4 versions earlier than 22.4R2-S2, 22.4R3;
o 23.2 versions earlier than 23.2R1-S1, 23.2R2.
This issue does not affect Juniper Networks Junos OS 21.4R1 and later versions
of 21.4.
To be affected by this vulnerability at least two interfaces need to be
configured with an STP:
[protocols (stp | mstp | rstp | vstp) interface <interface>]
Solution:
The following software releases have been updated to resolve this specific
issue: 21.2R3-S6, 22.1R3-S4, 22.2R3-S2, 22.3R3-S1, 22.4R2-S2, 22.4R3,
23.2R1-S1, 23.2R2, 23.4R1, and all subsequent releases.
This issue is being tracked as 1706933 which is visible on the Customer Support
website.
Note: Juniper SIRT's policy is not to evaluate releases which are beyond End of
Engineering (EOE) or End of Life (EOL).
Workaround:
There are no known workarounds for this issue.
Modification History:
2024-04-10: Initial Publication
Related Information:
o KB16613: Overview of the Juniper Networks SIRT Quarterly Security Bulletin
Publication Process
o KB16765: In which releases are vulnerabilities fixed?
o KB16446: Common Vulnerability Scoring System (CVSS) and Juniper's Security
Advisories
o Report a Security Vulnerability - How to Contact the Juniper Networks
Security Incident Response Team
o supportportal.juniper.net/JSA75746
o https://www.cve.org/CVERecord?id=CVE-2024-21605
Last Updated: 2024-04-10
Created: 2024-04-10
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