alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET EXPLOIT Pulse Secure Post-Auth OS Command Injection (CVE-2019-11539)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/dana-admin/diag/diag.cgi"; fast_pattern; content:"&options="; distance:0; content:"-r"; distance:0; reference:url,packetstormsecurity.com/files/154376/Pulse-Secure-8.1R15.1-8.2-8.3-9.0-SSL-VPN-Remote-Code-Execution.html; reference:url,packetstormsecurity.com/files/155277/Pulse-Secure-VPN-Arbitrary-Command-Execution.html; reference:cve,2019-11539; classtype:attempted-admin; sid:2034014; rev:1; metadata:affected_product Pulse_Secure, attack_target Server, created_at 2021_09_23, cve CVE_2019_11539, deployment Perimeter, deployment Internal, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Major, tag Exploit, tag CISA_KEV, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_23, mitre_tactic_id TA0008, mitre_tactic_name Lateral_Movement, mitre_technique_id T1210, mitre_technique_name Exploitation_Of_Remote_Services;)