CVE-2019-1859 Cisco Small Business Switches Secure Shell Certificate Authentication Bypass Vulnerability
Attacker bypasses SSH certificate authentication to gain administrative access if default credentials are unchanged, requiring disabling certificate auth as mitigation.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2019-1859?
CVE-2019-1859 is a high-severity authentication bypass vulnerability in Cisco Small Business 200 Series Smart Switches, published on 3 May 2019. An attacker needs administrator access to exploit it, with no action from the victim.
Official 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.
Which versions are affected by CVE-2019-1859?
It affects 114 products.
Products include Cisco Sf200-24 Firmware, Cisco Sf200-24fp Firmware, Cisco Sf200-24p Firmware, Cisco Sf200-48 Firmware, Cisco Sf200-48p Firmware, Cisco Sf250-24 Firmware and 108 more.
How do I fix CVE-2019-1859?
No fix has been published for CVE-2019-1859 yet. Limit exposure of the affected software until one is available.
Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.
Is CVE-2019-1859 being exploited?
There is no known exploitation of CVE-2019-1859 in the wild and no public exploit code.
Other vulnerabilities in Cisco Small Business 200 Series Smart Switches
- CVE-2018-15439 Cisco Small Business Switches Privileged Access Vulnerability
- CVE-2020-3363 Cisco Small Business Smart and Managed Switches Denial of Service Vulnerability
- CVE-2020-3297 Cisco Small Business Smart and Managed Switches Session Management Vulnerability
- CVE-2019-12636 Cisco Small Business Smart and Managed Switches Cross-Site Request Forgery Vulnerability
- CVE-2019-15993 Cisco Small Business Switches Information Disclosure Vulnerability
Sources
Also known as GHSA-vxf6-wwjr-wqh4.