CVE-2019-1859

Description

A vulnerability in the Secure Shell (SSH) authentication process of Cisco Small Business Switches software could allow an attacker to bypass client-side certificate authentication and revert to password authentication. The vulnerability exists because OpenSSH mishandles the authentication process. An attacker could exploit this vulnerability by attempting to connect to the device via SSH. A successful exploit could allow the attacker to access the configuration as an administrative user if the default credentials are not changed. There are no workarounds available; however, if client-side certificate authentication is enabled, disable it and use strong password authentication. Client-side certificate authentication is disabled by default.

Risk Information

Base Score

7.2

MODERATE

Vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

EPSS Score

Exploitation Probability

0.18

Associated Vulnerability

Vulnerability	OS Platform
Cisco Small Business Switches Secure Shell Certificate Authentication Bypass Vulnerability For Cisco Small Business 500 Series Stackable Managed Switches	NCM
Cisco Small Business Switches Secure Shell Certificate Authentication Bypass Vulnerability For Cisco LAN Switch Software	NCM
Improper Certificate Validation Vulnerability (CVE-2019-1859)	NCM

Patch Details

Click to see the patches provided by ManageEngine for this CVE

Patch ID	Patch Description
PATCH-1702168	Security Update for Cisco Small Business 500 Series Stackable Managed Switches 2.5.0.87
PATCH-1705934	Security Update for Cisco LAN Switch Software 1.0.1.1

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234