### [CVE-2016-4979](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-4979)
![](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

The Apache HTTP Server 2.4.18 through 2.4.20, when mod_http2 and mod_ssl are enabled, does not properly recognize the "SSLVerifyClient require" directive for HTTP/2 request authorization, which allows remote attackers to bypass intended access restrictions by leveraging the ability to send multiple requests over a single connection and aborting a renegotiation.

### POC

#### Reference
- http://packetstormsecurity.com/files/137771/Apache-2.4.20-X509-Authentication-Bypass.html
- http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html

#### Github
- https://github.com/auditt7708/rhsecapi
- https://github.com/bioly230/THM_Skynet
- https://github.com/vshaliii/Basic-Pentesting-2-Vulnhub-Walkthrough
- https://github.com/vshaliii/DC-3-Vulnhub-Walkthrough