cve/2019/CVE-2019-16254.md

### [CVE-2019-16254](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-16254)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### Description

Ruby through 2.4.7, 2.5.x through 2.5.6, and 2.6.x through 2.6.4 allows HTTP Response Splitting. If a program using WEBrick inserts untrusted input into the response header, an attacker can exploit it to insert a newline character to split a header, and inject malicious content to deceive clients. NOTE: this issue exists because of an incomplete fix for CVE-2017-17742, which addressed the CRLF vector, but did not address an isolated CR or an isolated LF.

### POC

#### Reference
- https://www.oracle.com/security-alerts/cpujan2020.html

#### Github
- https://github.com/Live-Hack-CVE/CVE-2020-5247