Vulnerability identifier: #VU88444

Vulnerability risk: Medium

CVSSv3.1: 5.7 [CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2024-21618

CWE-ID: CWE-788

Exploitation vector: Local network

Exploit availability: No

Vulnerable software:
Junos OS Evolved
Operating systems & Components / Operating system
Juniper Junos OS
Operating systems & Components / Operating system

Vendor: Juniper Networks, Inc.

Description

The vulnerability allows a remote non-authenticated attacker to perform a denial of service (DoS) attack.

The vulnerability exists due to access of memory location after end of buffer error in the Layer-2 Control Protocols Daemon (l2cpd). A remote non-authenticated attacker can 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.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Junos OS Evolved: 21.4R1-EVO - 21.4R3-S4-EVO, 22.1-EVO - 22.1R3-S3-EVO, 22.2-EVO - 22.2R3-S1-EVO, 22.3R1-EVO - 22.3R2-S1-EVO, 22.4R1-EVO - 22.4R2-S1-EVO, 22.4R2-S2-EVO, 23.2R1-EVO - 23.2R1-S1-EVO, 23.2R1-S2-EVO

Juniper Junos OS: 21.4R1 - 21.4R3-S3, 22.1R1 - 22.1R3-S3, 22.2R1 - 22.2R3-S1, 22.3R1 - 22.3R2-S1, 22.4R1 - 22.4R2-S2, 22.4R3-S1, 23.2R1 - 23.2R1-S1, 23.2R1-S2, 23.4R1-S1

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External links
http://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

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Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the local network (LAN).

Is there known malware, which exploits this vulnerability?

No. We are not aware of malware exploiting this vulnerability.