#VU79726 Improper authentication in Dropbear - CVE-2021-36369
Published: August 20, 2023
Vulnerability identifier: #VU79726
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2021-36369
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Dropbear
Dropbear
Software vendor:
Matt Johnston
Matt Johnston
Description
The vulnerability allows a remote user to bypass authentication process.
The vulnerability exists due to a non-RFC-compliant check of the available authentication methods in the client-side SSH code. A remote user can bypass additional security measures such as FIDO2 tokens or SSH-Askpass and abuse a forwarded agent for logging on to another server unnoticed.
Remediation
Install updates from vendor's website.