Improper Authentication in Kotlin Ktor - CVE-2021-43203
Published: November 8, 2021
Vulnerability identifier: #VU58000
CSH Severity: Medium
CVSS v4: 6.9 [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]
CVE-ID: CVE-2021-43203
CWE-ID: CWE-287
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
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.
Affected software
Kotlin Ktor
How to mitigate CVE-2021-43203
Install updates from vendor's website.
Kotlin Ktor - update to 1.6.4