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AUSCERT External Security Bulletin Redistribution
ESB-2024.2209
2024-04 Security Bulletin: Junos OS and Junos OS Evolved: When LLDP is
enabled and a malformed LLDP packet is received, l2cpd crashes
(CVE-2024-21618)
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-2024-21618
Original Bulletin:
https://supportportal.juniper.net/s/article/2024-04-Security-Bulletin-Junos-OS-and-Junos-OS-Evolved-When-LLDP-is-enabled-and-a-malformed-LLDP-packet-is-received-l2cpd-crashes-CVE-2024-21618
Comment: CVSS (Max): 6.5 CVE-2024-21618 (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: JSA75759
Product Affected: This issue affects Junos OS 21.4, 22.1, 22.2, 22.3, 22.4,
23.2. This issue affects Junos OS Evolved 21.4-EVO, 22.1-EVO, 22.2-EVO,
22.3-EVO, 22.4-EVO, 23.2-EVO.
Severity Level: Medium
CVSS Score: CVSS 3.1
Problem:
An Access of Memory Location After End of Buffer vulnerability in the Layer-2
Control Protocols Daemon (l2cpd) of Juniper Networks Junos OS and Junos OS
Evolved allows an adjacent, unauthenticated attacker to cause Denial of Service
(DoS).
On all Junos OS and Junos OS Evolved platforms, when LLDP is enabled on a
specific interface, and a malformed LLDP packet is received, l2cpd crashes and
restarts. The impact of the l2cpd crash is reinitialization of STP protocols
(RSTP, MSTP or VSTP), and MVRP and ERP. Also, if any services depend on LLDP
state (like PoE or VoIP device recognition), then these will also be affected.
This issue affects:
Junos OS
o from 21.4 before 21.4R3-S4,
o from 22.1 before 22.1R3-S4,
o from 22.2 before 22.2R3-S2,
o from 22.3 before 22.3R2-S2, 22.3R3-S1,
o from 22.4 before 22.4R3,
o from 23.2 before 23.2R2.
Junos OS Evolved
o from 21.4-EVO before 21.4R3-S5-EVO,
o from 22.1-EVO before 22.1R3-S4-EVO,
o from 22.2-EVO before 22.2R3-S2-EVO,
o from 22.3-EVO before 22.3R2-S2-EVO, 22.3R3-S1-EVO,
o from 22.4-EVO before 22.4R3-EVO,
o from 23.2-EVO before 23.2R2-EVO.
This issue does not affect:
o Junos OS versions before 21.4R1;
o Junos OS Evolved versions before 21.4R1-EVO.
This vulnerability is only exploitable on interfaces with LLDP enabled.
[protocols lldp interface]
Juniper SIRT is not aware of any malicious exploitation of this vulnerability.
This issue was discovered during production use.
This issue has been assigned CVE-2024-21618 .
Solution:
The following software releases have been updated to resolve this specific
issue:
Junos OS: 21.4R3-S4, 22.1R3-S4, 22.2R3-S2, 22.3R2-S2, 22.3R3-S1, 22.4R3,
23.2R2, 23.4R1 and all subsequent releases.
Junos OS Evolved: 21.4R3-S5-EVO, 22.1R3-S4-EVO, 22.2R3-S2-EVO, 22.3R2-S2-EVO,
22.3R3-S1-EVO, 22.4R3-EVO, 23.2R2-EVO, 23.4R1-EVO and all subsequent releases.
This issue is being tracked as 1747039 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 available workarounds for this issue.
But if LLDP and its services are not required, customers can disable LLDP.
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 https://www.cve.org/CVERecord?id=CVE-2024-21618
Last Updated: 2024-04-10
Created: 2024-04-10
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