ET EXPLOIT Yealink RCE Attempt (CVE-2021-27561)

Query · suricata

flow:established,to_server;
http.uri;
content:"/premise/front/getPingData?url=http|3a 2f 2f|0.0.0.0|3a|9600/sm/api/v1/firewall/zone/services?zone="; startswith; fast_pattern;
Raw source ET EXPLOIT Yealink RCE Attempt (CVE-2021-27561) · 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 Yealink RCE Attempt (CVE-2021-27561)";
    flow:established,to_server;
    http.uri;
    content:"/premise/front/getPingData?url=http|3a 2f 2f|0.0.0.0|3a|9600/sm/api/v1/firewall/zone/services?zone="; startswith; fast_pattern;
    reference:url,unit42.paloaltonetworks.com/mirai-variant-iot-vulnerabilities/;
    reference:url,ssd-disclosure.com/ssd-advisory-yealink-dm-pre-auth-root-level-rce/;
    reference:url,cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27561;
    reference:url,cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27562;
    reference:cve,2021-27561;
    classtype:attempted-admin;
    sid:2032095; rev:3;
    metadata:attack_target IoT, created_at 2021_03_17, cve CVE_2021_27561, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag CISA_KEV, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_20;
)

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.