alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET WEB_SPECIFIC_APPS Fortinet FortiWLM Unauthenticated Arbitrary File Read (CVE-2023-48783)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/ems/cgi-bin/ezrf_upgrade_images.cgi"; fast_pattern; content:"op_type=uploadstatus"; content:"progressfile|3d|"; pcre:"/^[^&]*?(?:(?:\x2e|%2[Ee]){1,2}(?:\x2f|\x5c|%5[Cc]|%2[Ff]){1,}){2,}/R"; reference:url,www.horizon3.ai/attack-research/attack-blogs/fortiwlm-the-almost-story-for-the-forti-forty; reference:cve,2023-48783; classtype:web-application-attack; sid:2058408; rev:1; metadata:affected_product FortiWLM, attack_target Server, tls_state TLSDecrypt, created_at 2024_12_19, cve CVE_2023_48783, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2024_12_19, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:dest_ip;)