CVE-2019-1859
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.
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.84%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.2 HIGHCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.84% probability · 56th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-285, CWE-295
- Affected
- cisco/sg200-50 firmware · cisco/sg200-50p firmware · cisco/sg200-50fp firmware · cisco/sg200-26 firmware · cisco/sg200-26p firmware · cisco/sg200-26fp firmware · cisco/sg200-18 firmware · cisco/sg200-10fp firmware · cisco/sg200-08 firmware · cisco/sg200-08p firmware · cisco/sf200-24 firmware · cisco/sf200-24p firmware · cisco/sf200-24fp firmware · cisco/sf200-48 firmware · cisco/sf200-48p firmware · cisco/sf302-08pp firmware · cisco/sf302-08mpp firmware · cisco/sg300-10pp firmware · cisco/sg300-10mpp firmware · cisco/sf300-24pp firmware · +40 more
- Source
- psirt@cisco.com
References
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.