ET EXPLOIT SonicWall SMA Stack-Based Buffer Overflow CVE-2021-20038 M1

Query · suricata

flow:established,to_server;
urilen:>400;
threshold:type threshold, track by_src, count 10, seconds 30;
http.request_line;
content:"GET /%"; startswith;
pcre:"/^[a-zA-Z0-9]{2}[%a-zA-Z0-9]{9}(?P<addr>(?:[%a-zA-Z0-9]{3}){4})(?P=addr)/R";
content:"%64%b8%06%08"; distance:0; within:55; fast_pattern;
content:"?";
Raw source ET EXPLOIT SonicWall SMA Stack-Based Buffer Overflow CVE-2021-20038 M1 · 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 SonicWall SMA Stack-Based Buffer Overflow CVE-2021-20038 M1";
    flow:established,to_server;
    urilen:>400;
    threshold:type threshold, track by_src, count 10, seconds 30;
    http.request_line;
    content:"GET /%"; startswith;
    pcre:"/^[a-zA-Z0-9]{2}[%a-zA-Z0-9]{9}(?P<addr>(?:[%a-zA-Z0-9]{3}){4})(?P=addr)/R";
    content:"%64%b8%06%08"; distance:0; within:55; fast_pattern;
    content:"?";
    reference:cve,2021-20038;
    classtype:attempted-admin;
    sid:2034984; rev:1;
    metadata:attack_target Server, created_at 2022_01_26, cve CVE_2021_20038, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag Exploit, tag CISA_KEV, updated_at 2022_01_26, 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.