alert http $EXTERNAL_NET any -> any any (msg:"ET EXPLOIT QNAP PhotoStation Authenticated Session Tampering Attempt"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"sysRequest.cgi"; endswith; http.request_body; content:"smtp_fw_update="; startswith; fast_pattern; content:"=<?"; distance:0; reference:url,medium.com/bugbountywriteup/qnap-pre-auth-root-rce-affecting-450k-devices-on-the-internet-d55488d28a05; classtype:attempted-admin; sid:2030204; rev:1; metadata:created_at 2020_05_21, deployment Perimeter, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_05_21;)