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Cisco Small Business Switches Secure Shell Certificate Authentication Bypass Vulnerability

cisco-sa-20190501-scbv · High · Published · Updated

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. Cisco has released software updates that address this vulnerability. There are no workarounds that address this vulnerability. This advisory is available at the following link: https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190501-scbv

Cisco advisory ·CSAF JSON

Workarounds

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.

CVEsCVE-2019-1859
Cisco Bug IDsCSCvo28588, CSCvp35704
CVSS ScoreBase 7.2
Base 7.2 CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H/E:X/RL:X/RC:X
Product Names From Source
Cisco Small Business 200 Series Smart Switches, Cisco Small Business 300 Series Managed Switches, Cisco Small Business 500 Series Stackable Managed Switches, Cisco Small Business 250 Series Smart Switches Software, Cisco Small Business 350 Series Managed Switches Software, Cisco Small Business 350X Series Managed Switches Software, Cisco Small Business 550X Series Stackable Managed Switches Software

CSAF Product Statuses

Product Status Source CVE Rows
Cisco Small Business 200 Series Smart Switches known_affected cisco_csaf CVE-2019-1859 1
Cisco Small Business 250 Series Smart Switches Software known_affected cisco_csaf CVE-2019-1859 1
Cisco Small Business 300 Series Managed Switches known_affected cisco_csaf CVE-2019-1859 1
Cisco Small Business 350 Series Managed Switches Software known_affected cisco_csaf CVE-2019-1859 1
Cisco Small Business 350X Series Managed Switches Software known_affected cisco_csaf CVE-2019-1859 1
Cisco Small Business 500 Series Stackable Managed Switches known_affected cisco_csaf CVE-2019-1859 1
Cisco Small Business 550X Series Stackable Managed Switches Software known_affected cisco_csaf CVE-2019-1859 1

Related Products

Product CVE Evidence
Cisco Small Business 200 Series Smart Switches CVE-2019-1859 Cisco OpenVuln · family-level
Cisco Small Business 250 Series Smart Switches Software CVE-2019-1859 Cisco OpenVuln · family-level
Cisco Small Business 300 Series Managed Switches CVE-2019-1859 Cisco OpenVuln · family-level
Cisco Small Business 350 Series Managed Switches Software CVE-2019-1859 Cisco OpenVuln · family-level
Cisco Small Business 350X Series Managed Switches Software CVE-2019-1859 Cisco OpenVuln · family-level
Cisco Small Business 500 Series Stackable Managed Switches CVE-2019-1859 Cisco OpenVuln · family-level
Cisco Small Business 550X Series Stackable Managed Switches Software CVE-2019-1859 Cisco OpenVuln · family-level
Cisco Business 250 Series Smart Switches CVE-2019-1859 Cisco OpenVuln
Cisco Business 350 Series Managed Switches CVE-2019-1859 Cisco OpenVuln
200 Series Smart Switches CVE-2019-1859 Cisco OpenVuln · family-level
300 Series Managed Switches CVE-2019-1859 Cisco OpenVuln · family-level
500 Series Stackable Managed Switches CVE-2019-1859 Cisco OpenVuln · family-level
Cisco Small Business 250 Series Smart Switches CVE-2019-1859 Cisco OpenVuln · family-level
Cisco Small Business 350 Series Managed Switches CVE-2019-1859 Cisco OpenVuln · family-level
Cisco Small Business 350X Series Stackable Managed Switches CVE-2019-1859 Cisco OpenVuln
Cisco Small Business 550X Series Stackable Managed Switches CVE-2019-1859 Cisco OpenVuln · family-level