ET WEB_SPECIFIC_APPS ManageEngine ServiceDesk Plus Arbitrary File Access via Parameter Traversal (CVE-2011-2755)

alert http any any -> $HOME_NET any (
    msg:"ET WEB_SPECIFIC_APPS ManageEngine ServiceDesk Plus Arbitrary File Access via Parameter Traversal (CVE-2011-2755)";
    flow:established,to_server;
    http.uri;
    content:"/workorder/FileDownload.jsp|3f|"; fast_pattern; startswith;
    content:"module|3d|agent";
    content:"FILENAME|3d|";
    pcre:"/^[^&]*?(?:(?:\x2e|%(?:25)?2[Ee]){1,2}(?:\x2f|\x5c|%(?:25)?5[Cc]|%(?:25)?2[Ff]){1,}){2,}/R";
    reference:url,www.exploit-db.com/exploits/17437;
    reference:cve,2011-2755;
    classtype:web-application-attack;
    sid:2066333; rev:1;
    metadata:affected_product Zoho_ManageEngine, attack_target Server, tls_state TLSDecrypt, created_at 2025_12_15, cve CVE_2011_2755, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, updated_at 2025_12_15, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)