Inconsistent interpretation of HTTP requests in Kotlin Ktor - CVE-2020-5207
Published: February 3, 2020 / Updated: February 4, 2020
Vulnerability identifier: #VU24831
CSH Severity: Medium
CVSS v4: 6.3 [CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N]
CVE-ID: CVE-2020-5207
CWE-ID: CWE-444
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to perform HTTP request smuggling attack.
The vulnerability exists due to insufficient validation of HTTP request when running headers behind a proxy that does not handle Content-Length and Transfer-Encoding properly or does not handle "n" as a headers separator. A remote attacker can send a specially crafted HTTP request and perform HTTP request smuggling attack.
Affected software
Kotlin Ktor
How to mitigate CVE-2020-5207
Install updates from vendor's website.
Kotlin Ktor - update to 1.3.0