CVEs-PoC/2020/CVE-2020-1935.md

### [CVE-2020-1935](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-1935)
![](https://img.shields.io/static/v1?label=Product&message=Apache%20Tomcat&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=HTTP%20Request%20Smuggling&color=brighgreen)

### Description

In Apache Tomcat 9.0.0.M1 to 9.0.30, 8.5.0 to 8.5.50 and 7.0.0 to 7.0.99 the HTTP header parsing code used an approach to end-of-line parsing that allowed some invalid HTTP headers to be parsed as valid. This led to a possibility of HTTP Request Smuggling if Tomcat was located behind a reverse proxy that incorrectly handled the invalid Transfer-Encoding header in a particular manner. Such a reverse proxy is considered unlikely.

### POC

#### Reference
- https://www.oracle.com/security-alerts/cpujan2021.html
- https://www.oracle.com/security-alerts/cpujul2020.html
- https://www.oracle.com/security-alerts/cpuoct2020.html

#### Github
- https://github.com/mklmfane/betvictor
- https://github.com/mo-xiaoxi/HDiff
- https://github.com/raner/projo
- https://github.com/vshaliii/Basic-Pentesting-2-Vulnhub-Walkthrough