ET WEB_SERVER GNU InetUtils Authentication Bypass via USER Environment Variable (CVE-2026-24061)

Query · suricata

flow:established,to_server;
content:"|ff fa 27 00 00|USER|01|"; fast_pattern;
content:"-f"; distance:0;
pcre:"/^\s+[\w-]+\xff\xf0/Ri";
target:dest_ip;
Raw source ET WEB_SERVER GNU InetUtils Authentication Bypass via USER Environment Variable (CVE-2026-24061) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert tcp any any -> $HOME_NET [23,2323] (
    msg:"ET WEB_SERVER GNU InetUtils Authentication Bypass via USER Environment Variable (CVE-2026-24061)";
    flow:established,to_server;
    content:"|ff fa 27 00 00|USER|01|"; fast_pattern;
    content:"-f"; distance:0;
    pcre:"/^\s+[\w-]+\xff\xf0/Ri";
    reference:url,seclists.org/oss-sec/2026/q1/89;
    reference:cve,2026-24061;
    classtype:attempted-admin;
    sid:2067186; rev:2;
    metadata:attack_target Client_and_Server, created_at 2026_01_23, cve CVE_2026_24061, deployment Perimeter, deployment Internal, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_01_30, former_sid 2865814;
    target:dest_ip;
)

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