Cisco Small Business Switches Secure Shell Certificate Authentication Bypass Vulnerability

2019-05-0116:00:00

tools.cisco.com

EPSS

0.001

Percentile

42.8%

JSON

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 [“https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20190501-scbv”]

Affected configurations

Vulners

Node

cisco200_series_smart_switchesMatchany

cisco300_series_managed_switchesMatchany

ciscosmall_business_500_series_stackable_managed_switches_firmwareMatchany

ciscocisco_small_business_250_series_smart_switches_softwareMatchany

ciscocisco_small_business_350_series_managed_switches_softwareMatchany

ciscocisco_small_business_350x_series_managed_switches_softwareMatchany

ciscocisco_small_business_550x_series_stackable_managed_switches_softwareMatchany

ciscosmall_business_srp541wMatch200_series_smart_switches

ciscosmall_business_srp541wMatch300_series_managed_switches

ciscosmall_business_srp541wMatch500_series_stackable_managed_switches

ciscosmall_business_srp541wMatch250_series_smart_switches_software

ciscosmall_business_srp541wMatch350_series_managed_switches_software

ciscosmall_business_srp541wMatch350x_series_managed_switches_software

ciscosmall_business_srp541wMatch550x_series_stackable_managed_switches_software

VendorProductVersionCPE
cisco200_series_smart_switchesanycpe:2.3:h:cisco:200_series_smart_switches:any:*:*:*:*:*:*:*
cisco300_series_managed_switchesanycpe:2.3:h:cisco:300_series_managed_switches:any:*:*:*:*:*:*:*
ciscosmall_business_500_series_stackable_managed_switches_firmwareanycpe:2.3:o:cisco:small_business_500_series_stackable_managed_switches_firmware:any:*:*:*:*:*:*:*
ciscocisco_small_business_250_series_smart_switches_softwareanycpe:2.3:a:cisco:cisco_small_business_250_series_smart_switches_software:any:*:*:*:*:*:*:*
ciscocisco_small_business_350_series_managed_switches_softwareanycpe:2.3:a:cisco:cisco_small_business_350_series_managed_switches_software:any:*:*:*:*:*:*:*
ciscocisco_small_business_350x_series_managed_switches_softwareanycpe:2.3:a:cisco:cisco_small_business_350x_series_managed_switches_software:any:*:*:*:*:*:*:*
ciscocisco_small_business_550x_series_stackable_managed_switches_softwareanycpe:2.3:a:cisco:cisco_small_business_550x_series_stackable_managed_switches_software:any:*:*:*:*:*:*:*
ciscosmall_business_srp541w200_series_smart_switchescpe:2.3:h:cisco:small_business_srp541w:200_series_smart_switches:*:*:*:*:*:*:*
ciscosmall_business_srp541w300_series_managed_switchescpe:2.3:h:cisco:small_business_srp541w:300_series_managed_switches:*:*:*:*:*:*:*
ciscosmall_business_srp541w500_series_stackable_managed_switchescpe:2.3:h:cisco:small_business_srp541w:500_series_stackable_managed_switches:*:*:*:*:*:*:*

Vendor	Product	Version	CPE
cisco	200_series_smart_switches	any	cpe:2.3:h:cisco:200_series_smart_switches:any:::::::*
cisco	300_series_managed_switches	any	cpe:2.3:h:cisco:300_series_managed_switches:any:::::::*
cisco	small_business_500_series_stackable_managed_switches_firmware	any	cpe:2.3:o:cisco:small_business_500_series_stackable_managed_switches_firmware:any:::::::*
cisco	cisco_small_business_250_series_smart_switches_software	any	cpe:2.3:a:cisco:cisco_small_business_250_series_smart_switches_software:any:::::::*
cisco	cisco_small_business_350_series_managed_switches_software	any	cpe:2.3:a:cisco:cisco_small_business_350_series_managed_switches_software:any:::::::*
cisco	cisco_small_business_350x_series_managed_switches_software	any	cpe:2.3:a:cisco:cisco_small_business_350x_series_managed_switches_software:any:::::::*
cisco	cisco_small_business_550x_series_stackable_managed_switches_software	any	cpe:2.3:a:cisco:cisco_small_business_550x_series_stackable_managed_switches_software:any:::::::*
cisco	small_business_srp541w	200_series_smart_switches	cpe:2.3:h:cisco:small_business_srp541w:200_series_smart_switches:::::::*
cisco	small_business_srp541w	300_series_managed_switches	cpe:2.3:h:cisco:small_business_srp541w:300_series_managed_switches:::::::*
cisco	small_business_srp541w	500_series_stackable_managed_switches	cpe:2.3:h:cisco:small_business_srp541w:500_series_stackable_managed_switches:::::::*