alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (msg:"ET EXPLOIT Possible Atlassian Confluence Improper Authentication Validation Exploitation Attempt set (CVE-2023-22518)"; flow:established,to_server; flowbits:set,ET.CVE-2023-22518.req; flowbits:noalert; http.method; content:"POST"; http.uri; content:"/json/setup-restore"; fast_pattern; content:".action"; within:20; http.header; header_lowercase; content:"x-atlassian-token|3a 20|no-check|0d|"; http.request_body; content:"filename=|22|"; pcre:"/^[^\x22]+\.zip\x22/Ri"; content:"Upload|20|and|20|import|0d 0a|"; nocase; reference:cve,2023-22518; classtype:attempted-admin; sid:2049096; rev:3; metadata:affected_product Atlassian_Confluence, attack_target Server, created_at 2023_11_06, cve CVE_2023_22518, deployment Perimeter, deployment Internal, confidence Medium, signature_severity Major, tag Exploit, tag CISA_KEV, updated_at 2024_04_20, reviewed_at 2023_11_06, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;)