alert http any any -> $HTTP_SERVERS any (msg:"ET WEB_SPECIFIC_APPS OGNL Expression Injection (CVE-2017-9791)"; flow:established,to_server; http.method; content:"POST"; nocase; http.request_body; content:"multipart"; content:"form-data"; distance:1; within:11; content:"ognl.OgnlContext"; distance:1; fast_pattern; content:"DEFAULT_MEMBER_ACCESS"; distance:1; within:23; content:"java.lang.ProcessBuilder"; distance:1; content:".start"; distance:1; reference:url,securityonline.info/tutorial-cve-2017-9791-apache-struts2-s2-048-remote-code-execution-vulnerability/; reference:cve,2017-9791; classtype:attempted-user; sid:2024468; rev:3; metadata:affected_product Apache_Struts2, attack_target Web_Server, created_at 2017_07_14, cve CVE_2017_9791, deployment Datacenter, performance_impact Low, confidence High, signature_severity Major, tag CISA_KEV, updated_at 2020_08_10;)