Unexpected behavior of Telnet service Junos OS Evolved

1) Improper Initialization

EUVDB-ID: #VU59570

Risk: Medium

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

CVE-ID: CVE-2022-22164

CWE-ID: CWE-665 - Improper Initialization

Exploit availability: No

Description

The vulnerability allows a remote attacker to abuse the system.

The vulnerability exists due to improper initialization, where a commit operation for disabling the telnet service does not take effect as expected, resulting in the telnet service staying enabled.

Mitigation

Install updates from vendor's website.

Vulnerable software versions

Junos OS Evolved: 20.4R1-EVO - 22.4R1-S2-EVO

CPE2.3

• cpe:2.3:o:juniper_networks:junos_os_evolved:21.4R3-S2-EVO:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:junos_os_evolved:22.4R1-S2-EVO:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:junos_os_evolved:22.2R2-S2-EVO:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:junos_os_evolved:22.3R1-S2-EVO:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:junos_os_evolved:21.2R1-S2-EVO:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:junos_os_evolved:20.4R2-S1-EVO:*:*:*:*:*:*:*
• cpe:2.3:o:juniper_networks:junos_os_evolved:21.1R3-S4-EVO:*:*:*:*:*:*:*

External links

http://kb.juniper.net/InfoCenter/index?page=content&id=JSA11272&cat=SIRT_1&actp=LIST
http://supportportal.juniper.net/s/article/2022-01-Security-Bulletin-Junos-OS-Evolved-Telnet-service-may-be-enabled-when-it-is-expected-to-be-disabled-CVE-2022-22164

Q & A

Can this vulnerability be exploited remotely?

Yes. This vulnerability can be exploited by a remote non-authenticated attacker via the Internet.

Is there known malware, which exploits this vulnerability?

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