high
7.2
CWE
295 285
Advisory Published
Updated

CVE-2019-1859: Cisco Small Business Switches Secure Shell Certificate Authentication Bypass Vulnerability

First published: Fri May 03 2019(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. 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.

Credit: ykramarz@cisco.com

Affected SoftwareAffected VersionHow to fix
Cisco Sg200-50 Firmware<1.4.10.6
Cisco Sg200-50
Cisco Sg200-50p Firmware<1.4.10.6
Cisco Sg200-50p
Cisco Sg200-50fp Firmware<1.4.10.6
Cisco Sg200-50fp
Cisco Sg200-26 Firmware<1.4.10.6
Cisco Sg200-26
Cisco Sg200-26p Firmware<1.4.10.6
Cisco Sg200-26p
Cisco Sg200-26fp Firmware<1.4.10.6
Cisco Sg200-26fp
Cisco Sg200-18 Firmware<1.4.10.6
Cisco Sg200-18
Cisco Sg200-10fp Firmware<1.4.10.6
Cisco Sg200-10fp
Cisco Sg200-08 Firmware<1.4.10.6
Cisco Sg200-08
Cisco Sg200-08p Firmware<1.4.10.6
Cisco Sg200-08p
Cisco Sf200-24 Firmware<1.4.10.6
Cisco Sf200-24
Cisco Sf200-24p Firmware<1.4.10.6
Cisco Sf200-24p
Cisco Sf200-24fp Firmware<1.4.10.6
Cisco Sf200-24fp
Cisco Sf200-48 Firmware<1.4.10.6
Cisco Sf200-48
Cisco Sf200-48p Firmware<1.4.10.6
Cisco Sf200-48p
Cisco Sf302-08pp Firmware<1.4.10.6
Cisco Sf302-08pp
Cisco Sf302-08mpp Firmware<1.4.10.6
Cisco Sf302-08mpp
Cisco Sg300-10pp Firmware<1.4.10.6
Cisco Sg300-10pp
Cisco Sg300-10mpp Firmware<1.4.10.6
Cisco Sg300-10mpp
Cisco Sf300-24pp Firmware<1.4.10.6
Cisco Sf300-24pp
Cisco Sf300-48pp Firmware<1.4.10.6
Cisco Sf300-48pp
Cisco Sg300-28pp Firmware<1.4.10.6
Cisco Sg300-28pp
Cisco Sf300-08 Firmware<1.4.10.6
Cisco Sf300-08
Cisco Sf300-48p Firmware<1.4.10.6
Cisco Sf300-48p
Cisco Sg300-10mp Firmware<1.4.10.6
Cisco Sg300-10mp
Cisco Sg300-10p Firmware<1.4.10.6
Cisco Sg300-10p
Cisco Sg300-10 Firmware<1.4.10.6
Cisco Sg300-10
Cisco Sg300-28p Firmware<1.4.10.6
Cisco Sg300-28p
Cisco Sf300-24p Firmware<1.4.10.6
Cisco Sf300-24p
Cisco Sf302-08mp Firmware<1.4.10.6
Cisco Sf302-08mp
Cisco Sg300-28 Firmware<1.4.10.6
Cisco Sg300-28
Cisco Sf300-48 Firmware<1.4.10.6
Cisco Sf300-48
Cisco Sg300-20 Firmware<1.4.10.6
Cisco Sg300-20
Cisco Sf302-08p Firmware<1.4.10.6
Cisco Sf302-08p
Cisco Sg300-52 Firmware<1.4.10.6
Cisco Sg300-52
Cisco Sf300-24 Firmware<1.4.10.6
Cisco Sf300-24
Cisco Sf302-08 Firmware<1.4.10.6
Cisco Sf302-08
Cisco Sf300-24mp Firmware<1.4.10.6
Cisco Sf300-24mp
Cisco Sg300-10sfp Firmware<1.4.10.6
Cisco Sg300-10sfp
Cisco Sg300-28mp Firmware<1.4.10.6
Cisco Sg300-28mp
Cisco Sg300-52p Firmware<1.4.10.6
Cisco Sg300-52p
Cisco Sg300-52mp Firmware<1.4.10.6
Cisco Sg300-52mp
Cisco Sg500-28mpp Firmware<1.4.10.6
Cisco Sg500-28mpp
Cisco Sg500-52mp Firmware<1.4.10.6
Cisco Sg500-52mp
Cisco Sg500xg-8f8t Firmware<1.4.10.6
Cisco Sg500xg-8f8t
Cisco Sf500-24 Firmware<1.4.10.6
Cisco Sf500-24
Cisco Sf500-24p Firmware<1.4.10.6
Cisco Sf500-24p
Cisco Sf500-48 Firmware<1.4.10.6
Cisco Sf500-48
Cisco Sf500-48p Firmware<1.4.10.6
Cisco Sf500-48p
Cisco Sg500-28 Firmware<1.4.10.6
Cisco Sg500-28
Cisco Sg500-28p Firmware<1.4.10.6
Cisco Sg500-28p
Cisco Sg500-52 Firmware<1.4.10.6
Cisco Sg500-52
Cisco Sg500-52p Firmware<1.4.10.6
Cisco Sg500-52p
Cisco Sg500x-24 Firmware<1.4.10.6
Cisco Sg500x-24
Cisco Sg500x-24p Firmware<1.4.10.6
Cisco Sg500x-24p
Cisco Sg500x-48 Firmware<1.4.10.6
Cisco Sg500x-48
Cisco Sg500x-48p Firmware<1.4.10.6
Cisco Sg500x-48p
Cisco Sg250x-24 Firmware<2.5.0.78
Cisco Sg250x-24
Cisco Sg250x-24p Firmware<2.5.0.78
Cisco Sg250x-24p
Cisco Sg250x-48 Firmware<2.5.0.78
Cisco Sg250x-48
Cisco Sg250x-48p Firmware<2.5.0.78
Cisco Sg250x-48p
Cisco Sg250-08 Firmware<2.5.0.78
Cisco Sg250-08
Cisco Sg250-08hp Firmware<2.5.0.78
Cisco Sg250-08hp
Cisco Sg250-10p Firmware<2.5.0.78
Cisco Sg250-10p
Cisco Sg250-18 Firmware<2.5.0.78
Cisco Sg250-18
Cisco Sg250-26 Firmware<2.5.0.78
Cisco Sg250-26
Cisco Sg250-26hp Firmware<2.5.0.78
Cisco Sg250-26hp
Cisco Sg250-26p Firmware<2.5.0.78
Cisco Sg250-26p
Cisco Sg250-50 Firmware<2.5.0.78
Cisco Sg250-50
Cisco Sg250-50hp Firmware<2.5.0.78
Cisco Sg250-50hp
Cisco Sg250-50p Firmware<2.5.0.78
Cisco Sg250-50p
Cisco Sf250-24 Firmware<2.5.0.78
Cisco Sf250-24
Cisco Sf250-24p Firmware<2.5.0.78
Cisco Sf250-24p
Cisco Sf250-48 Firmware<2.5.0.78
Cisco Sf250-48
Cisco Sf250-48hp Firmware<2.5.0.78
Cisco Sf250-48hp
Cisco Sg350-10 Firmware<2.5.0.78
Cisco Sg350-10
Cisco Sg350-10p Firmware<2.5.0.78
Cisco Sg350-10p
Cisco Sg350-10mp Firmware<2.5.0.78
Cisco Sg350-10mp
Cisco Sg355-10p Firmware<2.5.0.78
Cisco Sg355-10p
Cisco Sg350-28 Firmware<2.5.0.78
Cisco Sg350-28
Cisco Sg350-28p Firmware<2.5.0.78
Cisco Sg350-28p
Cisco Sg350-28mp Firmware<2.5.0.78
Cisco Sg350-28mp
Cisco Sf350-48 Firmware<2.5.0.78
Cisco Sf350-48
Cisco Sf350-48p Firmware<2.5.0.78
Cisco Sf350-48p
Cisco Sf350-48mp Firmware<2.5.0.78
Cisco Sf350-48mp
Cisco Sg350xg-2f10 Firmware<2.5.0.78
Cisco Sg350xg-2f10
Cisco Sg350xg-24f Firmware<2.5.0.78
Cisco Sg350xg-24f
Cisco Sg350xg-24t Firmware<2.5.0.78
Cisco Sg350xg-24t
Cisco Sg350xg-48t Firmware<2.5.0.78
Cisco Sg350xg-48t
Cisco Sg350x-24 Firmware<2.5.0.78
Cisco Sg350x-24
Cisco Sg350x-24p Firmware<2.5.0.78
Cisco Sg350x-24p
Cisco Sg350x-24mp Firmware<2.5.0.78
Cisco Sg350x-24mp
Cisco Sg350x-48 Firmware<2.5.0.78
Cisco Sg350x-48
Cisco Sg350x-48p Firmware<2.5.0.78
Cisco Sg350x-48p
Cisco Sg350x-48mp Firmware<2.5.0.78
Cisco Sg350x-48mp
Cisco Sx550x-16ft Firmware<2.5.0.78
Cisco Sx550x-16ft
Cisco Sx550x-24ft Firmware<2.5.0.78
Cisco Sx550x-24ft
Cisco Sx550x-12f Firmware<2.5.0.78
Cisco Sx550x-12f
Cisco Sx550x-24f Firmware<2.5.0.78
Cisco Sx550x-24f
Cisco Sx550x-24 Firmware<2.5.0.78
Cisco Sx550x-24
Cisco Sx550x-52 Firmware<2.5.0.78
Cisco Sx550x-52
Cisco Sg550x-24 Firmware<2.5.0.78
Cisco Sg550x-24
Cisco Sg550x-24p Firmware<2.5.0.78
Cisco Sg550x-24p
Cisco Sg550x-24mp Firmware<2.5.0.78
Cisco Sg550x-24mp
Cisco Sg550x-24mpp Firmware<2.5.0.78
Cisco Sg550x-24mpp
Cisco Sg550x-48 Firmware<2.5.0.78
Cisco Sg550x-48
Cisco Sg550x-48p Firmware<2.5.0.78
Cisco Sg550x-48p
Cisco Sg550x-48mp Firmware<2.5.0.78
Cisco Sg550x-48mp
Cisco Sf550x-24 Firmware<2.5.0.78
Cisco Sf550x-24
Cisco Sf550x-24p Firmware<2.5.0.78
Cisco Sf550x-24p
Cisco Sf550x-24mp Firmware<2.5.0.78
Cisco Sf550x-24mp
Cisco Sf550x-48 Firmware<2.5.0.78
Cisco Sf550x-48
Cisco Sf550x-48p Firmware<2.5.0.78
Cisco Sf550x-48p
Cisco Sf550x-48mp Firmware<2.5.0.78
Cisco Sf550x-48mp

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