ET EXPLOIT [ConnectWise CRU] Potential Sonicwall SMA User-Level Authentication Bypass (sslvpnclient) (CVE-2021-20016)

Query · suricata

flow:established,to_server;
http.uri;
content:"/cgi-bin/sslvpnclient";
http.referer;
content:!"/__api__/v1/logon";
content:!"/cgi-bin/userLogin";
tag:session,5,packets;
target:dest_ip;
Raw source ET EXPLOIT [ConnectWise CRU] Potential Sonicwall SMA User-Level Authentication Bypass (sslvpnclient) (CVE-2021-20016) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET EXPLOIT [ConnectWise CRU] Potential Sonicwall SMA User-Level Authentication Bypass (sslvpnclient) (CVE-2021-20016)";
    flow:established,to_server;
    http.uri;
    content:"/cgi-bin/sslvpnclient";
    http.referer;
    content:!"/__api__/v1/logon";
    content:!"/cgi-bin/userLogin";
    tag:session,5,packets;
    reference:cve,2021-20016;
    reference:url,www.jpcert.or.jp/english/at/2021/at210006.html;
    classtype:web-application-attack;
    sid:2033346; rev:2;
    metadata:created_at 2021_07_16, cve CVE_2021_20016, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag CISA_KEV, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_07_16, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)

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