Local denial of service in Junos OS on EX2300 and EX3400 series routers

1) Resource management error

EUVDB-ID: #VU81668

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-2022-22234

CWE-ID: CWE-399 - Resource Management Errors

Exploit availability: No

Description

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

The vulnerability exists due to improper management of internal resources in the Packet Forwarding Engine (PFE). If the device is very busy for example while executing a series of show commands on the CLI one or more SFPs might not be detected anymore. The system then changes its state to "unplugged" which is leading to traffic impact and at least a partial DoS. A local user can cause a high load for the device and perform a denial of service attack.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Juniper Junos OS: 18.4 - 21.4R1-S2

External links

http://supportportal.juniper.net/s/article/2022-10-Security-Bulletin-Junos-OS-EX2300-and-EX3400-Series-One-of-more-SFPs-might-become-unavailable-when-the-system-is-very-busy-CVE-2022-22234

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.