ET WEB_SPECIFIC_APPS D-Link Arbitrary File Read Via webproc errorpage Parameter (CVE-2021-27250)

Query · suricata

flow:established,to_server;
http.method;
content:"POST";
http.uri; bsize:16;
content:"/cgi-bin/webproc"; fast_pattern;
http.cookie;
content:"sys_UserName|3d|admin";
http.request_body;
content:"errorpage|3d|";
pcre:"/^(?:\x2f|[^\x26]*?(?:(?:\x2e|%2[Ee]){1,2}(?:\x2f|\x5c|%5[Cc]|%2[Ff]){1,}){2,})/R";
target:dest_ip;
Raw source ET WEB_SPECIFIC_APPS D-Link Arbitrary File Read Via webproc errorpage Parameter (CVE-2021-27250) · 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 any (
    msg:"ET WEB_SPECIFIC_APPS D-Link Arbitrary File Read Via webproc errorpage Parameter (CVE-2021-27250)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.uri; bsize:16;
    content:"/cgi-bin/webproc"; fast_pattern;
    http.cookie;
    content:"sys_UserName|3d|admin";
    http.request_body;
    content:"errorpage|3d|";
    pcre:"/^(?:\x2f|[^\x26]*?(?:(?:\x2e|%2[Ee]){1,2}(?:\x2f|\x5c|%5[Cc]|%2[Ff]){1,}){2,})/R";
    reference:cve,2021-27250;
    reference:url,github.com/PeiQi0/PeiQi-WIKI-Book/tree/main/docs/wiki/iot;
    classtype:attempted-admin;
    sid:2063272; rev:1;
    metadata:affected_product D_Link, attack_target Networking_Equipment, tls_state plaintext, created_at 2025_07_02, cve CVE_2021_27250, deployment Perimeter, deployment Internal, performance_impact Low, confidence High, signature_severity Major, tag Exploit, updated_at 2025_07_02, 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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