#VU58000 Improper Authentication in Kotlin Ktor - CVE-2021-43203
Published: November 8, 2021
Vulnerability identifier: #VU58000
Vulnerability risk: Medium
CVSSv4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2021-43203
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerable software:
Kotlin Ktor
Kotlin Ktor
Software vendor:
JetBrains s.r.o.
JetBrains s.r.o.
Description
The vulnerability allows a remote attacker to bypass authentication process.
The vulnerability exists due to improper nonce verification during the OAuth2 authentication process. A remote attacker can bypass authentication process and gain unauthorized access to the application.
Remediation
Install updates from vendor's website.