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2022-01 Security Bulletin: Junos OS Evolved: Telnet service may be enabled when it is expected to be disabled. (CVE-2022-22164)

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Article ID: JSA11272 SECURITY_ADVISORIES Last Updated: 12 Jan 2022Version: 1.0
Product Affected:
This issue affects Junos OS Evolved all versions prior to 20.4R2-S2-EVO, 21.1, 21.2.
Problem:

An Improper Initialization vulnerability in Juniper Networks Junos OS Evolved may cause a commit operation for disabling the telnet service to not take effect as expected, resulting in the telnet service staying enabled.

When it is not intended to be operating on the device, an administrator can issue the following command to verify whether telnet is operating in the background:

user@device > show system connections | grep :23
tcp 0 0 0.0.0.0:23 0.0.0.0:* LISTEN 20879/xinetd

This issue affects:

Juniper Networks Junos OS Evolved

All versions prior to 20.4R2-S2-EVO;

21.1 version 21.1R1-EVO and later versions;

21.2 versions prior to 21.2R2-EVO.

Juniper SIRT is not aware of any malicious exploitation of this vulnerability.

This issue was seen during production usage.

This issue has been assigned CVE-2022-22164.

Solution:

The following software releases have been updated to resolve this specific issue: Junos OS Evolved: 20.4R2-S2-EVO, 21.2R2-EVO, 21.3R1-EVO and all subsequent releases.

This issue is being tracked as 1596411.

Workaround:

To work around the issue, the xinetd service can be restarted manually using one of the commands below:

user@device% systemctl restart xinetd

or

user@device% systemctl restart services-xinetd

Additionally, loopback/firewall filters can be applied to disable remote access to the telnet service.

Implementation:
Software releases or updates are available for download at https://support.juniper.net/support/downloads/
 
Modification History:
2022-01-12: Initial Publication.
CVSS Score:
6.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N)
Severity Level:
Medium
Severity Assessment:
Information for how Juniper Networks uses CVSS can be found at KB 16446 "Common Vulnerability Scoring System (CVSS) and Juniper's Security Advisories."

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