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AUSCERT External Security Bulletin Redistribution
ESB-2024.2219
2024-04 Security Bulletin: Junos OS and Junos OS Evolved: In a EVPN-VXLAN
scenario state changes on adjacent systems can cause an l2ald process crash
(CVE-2024-30386)
11 April 2024
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AusCERT Security Bulletin Summary
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Product: Junos OS
Junos OS Evolved
Publisher: Juniper Networks
Operating System: Juniper
Resolution: Patch/Upgrade
CVE Names: CVE-2024-30386
Original Bulletin:
https://supportportal.juniper.net/s/article/2024-04-Security-Bulletin-Junos-OS-and-Junos-OS-Evolved-In-a-EVPN-VXLAN-scenario-state-changes-on-adjacent-systems-can-cause-an-l2ald-process-crash-CVE-2024-30386
Comment: CVSS (Max): 5.3 CVE-2024-30386 (CVSS:3.1/AV:A/AC:H/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:H/PR:N/UI:N/S:U/C:N/I:N/A:H
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Article ID: JSA79184
Product Affected: This issue affects all versions of Junos OS. This issue
affects all versions of Junos OS Evolved.
Severity Level: Medium
CVSS Score: CVSS 3.1
Problem:
A Use-After-Free vulnerability in <component> of Juniper Networks Junos OS and
Junos OS Evolved allows an unauthenticated, adjacent attacker to cause l2ald to
crash leading to a Denial-of-Service (DoS).
In an EVPN-VXLAN scenario, when state updates are received and processed by the
affected system, the correct order of some processing steps is not ensured,
which can lead to an l2ald crash and restart. Whether the crash occurs depends
on system internal timing which is outside the attackers control.
This issue affects:
Junos OS:
o All versions before 20.4R3-S8,
o 21.2 versions before 21.2R3-S6,
o 21.3 versions before 21.3R3-S5,
o 21.4 versions before 21.4R3-S4,
o 22.1 versions before 22.1R3-S3,
o 22.2 versions before 22.2R3-S1,
o 22.3 versions before 22.3R3,,
o 22.4 versions before 22.4R2;
Junos OS Evolved:
o All versions before 20.4R3-S8-EVO,
o 21.2 versions before 21.2R3-S6-EVO,
o 21.3 versions before 21.3R3-S5-EVO,
o 21.4 versions before 21.4R3-S4-EVO,
o 22.1 versions before 22.1R3-S3-EVO,
o 22.2 versions before 22.2R3-S1-EVO,
o 22.3 versions before 22.3R3-EVO,
o 22.4 versions before 22.4R2-EVO.
To be exposed to this issue the device must be configured for EVPN-VXLAN. Refer
to product documentation for how to configure EVPN-VXLAN as there are different
configuration options.
Solution:
The following software releases have been updated to resolve this specific
issue:
Junos OS: 20.4R3-S8, 21.2R3-S6, 21.3R3-S5, 21.4R3-S4, 21.4R3-S5, 22.1R3-S3,
22.2R3-S1, 22.3R3, 22.3R3-S2, 22.4R2, 23.2R1, and all subsequent releases;
Junos OS Evolved: 20.4R3-S8-EVO, 21.2R3-S6-EVO, 21.3R3-S5-EVO, 21.4R3-S4-EVO,
22.1R3-S3-EVO, 22.2R3-S1-EVO, 22.3R3-EVO, 22.4R2-EVO, 23.2R1-EVO, and all
subsequent releases.
This issue is being tracked as 1700170 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
Last Updated: 2024-04-10
Created: 2024-04-10
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