Introducing the Cloudflare PHP Capture the Flag challenge

Last week was one for the Internet security history books. First, eight eMudhra intermediate certificates were compromised, creating the possibility of forged certificates that could be used to impersonate servers. Then came php2shell: serious vulnerabilities in PHP, the runtime behind a large portion of the Web. Cloudflare worked around the clock as these events unfolded to protect our customers and help protect the Internet. We shipped client updates and multiple mitigations, updated our web application firewall (WAF) with new rules to block attackers from exploiting the PHP vulnerabilities, and introduced a new feature called full transaction detection. As…