Inconsistent interpretation of HTTP requests in Netty - CVE-2020-7238

Vulnerability identifier: #VU25353

CSH Severity: 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-2020-7238

CWE-ID: CWE-444

Exploitation vector: Remote access

Exploit availability: No public exploit available

Vulnerable software:
Netty

Software vendor:
Netty project

The vulnerability allows a remote attacker to perform HTTP request smuggling attack.

The vulnerability exists due to improper input validation when processing a whitespace before the colon in HTTP headers (e.g. "Transfer-Encoding : chunked") and a later Content-Length header. A remote attacker can send a specially crafted HTTP request and perform HTTP request smuggling attack.

This issue exists because of an incomplete fix for CVE-2019-16869 (SB2019092616).

Install updates from vendor's website.

• https://access.redhat.com/errata/RHSA-2020:0497
• https://github.com/jdordonezn/CVE-2020-72381/issues/1
• https://netty.io/news/