Denial of service in Junos OS MPC

Published: 2023-07-16

Risk	Medium
Patch available	YES
Number of vulnerabilities	1
CVE-ID	CVE-2023-36850
CWE-ID	CWE-20
Exploitation vector	Local network
Public exploit	N/A
Vulnerable software Subscribe	Juniper Junos OS Operating systems & Components / Operating system
Vendor	Juniper Networks, Inc.

Security Bulletin

This security bulletin contains one medium risk vulnerability.

1) Input validation error

EUVDB-ID: #VU78282

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-2023-36850

CWE-ID: CWE-20 - Improper input validation

Exploit availability: No

Description

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

The vulnerability exists due to insufficient validation of user-supplied input in the Connectivity Fault Management(CFM) module of Juniper Networks Junos OS on MX Series(except MPC10, MPC11 and LC9600) . A remote attacker on the local network can send a malformed CFM packet to the affected system and crash the MPC.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 19.1 - 22.4R1-S2

External links

http://supportportal.juniper.net/s/article/2023-07-Security-Bulletin-Junos-OS-MX-Series-An-MPC-will-crash-upon-receipt-of-a-malformed-CFM-packet-CVE-2023-36850

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.