Create CVE-2018-11759-Apache mod_jk access control bypass.bcheck

[CraigDonkin]

This is a bcheck to detect CVE-2018-11759. This PoC can be used to test the bcheck:

https://github.com/immunIT/CVE-2018-11759

BCheck Contributions

• [ ] BCheck compiles and executes as expected
• [ ] BCheck contains appropriate metadata (name, version, author, description and appropriate tags)
• [ ] Only .bcheck files have been added or modified
• [ ] BCheck is in the appropriate folder
• [ ] PR contains single or limited number of BChecks (Multiple PRs are preferred)
• [ ] BCheck attempts to minimize false positives

[PortSwiggerWiener]

Thanks for the PR! It looks good. Minor comments above.

[PortSwiggerWiener]

Many thanks for your contribution!