ET EXPLOIT Possible MovableTypePoC RCE Inbound (CVE-2021-20837)

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri;
content:"mt-xmlrpc.cgi"; fast_pattern;
http.request_body;
content:"<?";
content:"<base64>"; distance:0;
base64_decode:offset 0,relative;
base64_data;
content:"|60|"; startswith;
Raw source ET EXPLOIT Possible MovableTypePoC RCE Inbound (CVE-2021-20837) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (
    msg:"ET EXPLOIT Possible MovableTypePoC RCE Inbound (CVE-2021-20837)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri;
    content:"mt-xmlrpc.cgi"; fast_pattern;
    http.request_body;
    content:"<?";
    content:"<base64>"; distance:0;
    base64_decode:offset 0,relative;
    base64_data;
    content:"|60|"; startswith;
    reference:cve,2021-20837;
    classtype:attempted-admin;
    sid:2034366; rev:1;
    metadata:attack_target Server, created_at 2021_11_09, cve CVE_2021_20837, deployment Perimeter, deployment Internal, confidence Medium, signature_severity Major, tag Exploit, updated_at 2023_04_06, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
)

Detection rules belong to the projects that publish them and remain under their own licenses. This site indexes and links to them; it claims no rights in them.