alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET WEB_SPECIFIC_APPS Apache SkyWalking GraphQL SQL Injection Inbound (CVE-2020-13921)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/graphql"; fast_pattern; http.request_body; content:"|7b 22|query"; nocase; startswith; content:"|27 29|"; pcre:"/^\s?.{0,100}(?:SELECT|UNION|CHAR|LONGVARCHAR|SCHEMA|FROM|WHERE|IFNULL|INSERT|UPDATE)/R"; reference:url,blog.csdn.net/caiqiiqi/article/details/107857173; reference:cve,2020-13921; classtype:attempted-admin; sid:2033403; rev:2; metadata:created_at 2021_07_24, cve CVE_2020_13921, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_08_16, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;)