#VU55005 Insufficient verification of data authenticity in PuTTY - CVE-2021-36367
Published: July 20, 2021
Vulnerability identifier: #VU55005
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2021-36367
CWE-ID: CWE-345
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
PuTTY
PuTTY
Software vendor:
Simon Tatham
Simon Tatham
Description
The vulnerability allows a remote attacker to perform spoofing attack.
The vulnerability exists due to insufficient verification of data source when processing authentication responses. A remote attacker can send a spoofed authentication prompt even after an SSH session has been established with the original server and trick the victim into providing authentication credentials.
Remediation
Install updates from vendor's website.