Vulnerability identifier: #VU78281

Vulnerability risk: Low

CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C]

CVE-ID: CVE-2023-36840

CWE-ID: CWE-617

Exploitation vector: Local

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 local user to perform a denial of service (DoS) attack.

The vulnerability exists due to a reachable assertion in Routing Protocol Daemon (RPD). A local user can execute a specific L2VPN command and crash the RPD daemon.

Mitigation
Install updates from vendor's website.

Vulnerable software versions

Junos OS Evolved: 20.4 - 20.4R3-S6-EVO, 20.4R2-S2-EVO, 22.3R1-EVO - 22.3R1-S2-EVO, 22.1-EVO - 22.1R2-S1-EVO, 22.2-EVO - 22.2R1-S1-EVO, 21.4R1-EVO - 21.4R2-S2-EVO

Juniper Junos OS: 22.3R1 - 22.3R1-S2, 21.1 - 21.1R3-S3, 20.2 - 20.2R3-S5, 19.4 - 19.4R3-S9, 19.4R1 - 19.4R1-S4, 20.4 - 20.4R3-S4, 22.2R1 - 22.2R1-S2, 22.1R1 - 22.1R2-S2, 21.2R1 - 21.2R3-S2, 19.3 - 19.3R3-S6, 19.3R1-S1, 19.3R2 - 19.3R2-S7, 21.3R1 - 21.3R3-S1, 21.4R1 - 21.4R2-S2

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External links
http://supportportal.juniper.net/s/article/2023-07-Security-Bulletin-Junos-OS-and-Junos-OS-Evolved-An-rpd-crash-occurs-when-a-specific-L2VPN-command-is-run-CVE-2023-36840

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Q & A

Can this vulnerability be exploited remotely?

No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.

Is there known malware, which exploits this vulnerability?

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