ET EXPLOIT Possible Zend Framework Exploit (CVE-2021-3007)

alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET EXPLOIT Possible Zend Framework Exploit (CVE-2021-3007)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"/zend3/public/"; bsize:14; fast_pattern;
    http.request_body;
    content:"zend"; nocase;
    content:"validator"; nocase; distance:0;
    content:"callback"; nocase; distance:0;
    content:"file_put_contents"; nocase;
    reference:url,research.checkpoint.com/2021/freakout-leveraging-newest-vulnerabilities-for-creating-a-botnet/;
    reference:cve,2021-3007;
    classtype:attempted-admin;
    sid:2031536; rev:1;
    metadata:created_at 2021_01_22, cve CVE_2021_3007, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_01_22;
)