ET EXPLOIT Possible F5 BIG-IP Infoleak and Out-of-Bounds Write Inbound (CVE-2021-22991)

Query · suricata

flow:established,to_server;
http.method;
content:"GET";
http.uri;
content:"|3a 2f 2f 5b|"; fast_pattern;
content:"|5d|"; endswith;
Raw source ET EXPLOIT Possible F5 BIG-IP Infoleak and Out-of-Bounds Write Inbound (CVE-2021-22991) · 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 Possible F5 BIG-IP Infoleak and Out-of-Bounds Write Inbound (CVE-2021-22991)";
    flow:established,to_server;
    http.method;
    content:"GET";
    http.uri;
    content:"|3a 2f 2f 5b|"; fast_pattern;
    content:"|5d|"; endswith;
    reference:url,bugs.chromium.org/p/project-zero/issues/detail?id=2126;
    reference:cve,2021-22991;
    classtype:attempted-admin;
    sid:2032173; rev:1;
    metadata:attack_target Server, created_at 2021_03_18, cve CVE_2021_22991, deployment Perimeter, deployment Internal, confidence Medium, signature_severity Major, tag CISA_KEV, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_03_18;
)

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.