alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS Cleo MFT Arbitrary File Write (CVE-2024-55956)"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/Synchronization"; http.header; content:"VLSync|3a 20|"; fast_pattern; nocase; content:"ReceivedReceipt|3b|"; distance:0; nocase; content:"path|3d|"; distance:0; pcre:"/^[^\x0d\x0a\x3b]*[\x2f\x5c]/R"; reference:url,attackerkb.com/topics/geR0H8dgrE/cve-2024-55956/rapid7-analysis; reference:cve,2024-55956; classtype:web-application-attack; sid:2058301; rev:1; metadata:attack_target Server, tls_state TLSDecrypt, created_at 2024_12_16, cve CVE_2024_55956, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, tag CISA_KEV, updated_at 2024_12_16, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)