ET WEB_SPECIFIC_APPS N-able N-central Session ID Disclosure

Query · suricata

flow:established,to_client;
flowbits:isset,ET.N_able_N_central.CVE_2025_9316;
http.response_body;
content:"ns1|3a|sessionHelloResponse"; fast_pattern;
content:"|3c 2f|sessionid|3e|"; nocase; distance:0;
pcre:"/\x3e\d+\x3c\x2fsessionid\x3e/i";
http.stat_code;
content:"200";
target:dest_ip;

Rule dependencies

⚠ Higher-order rule. It fires on other rules' alerts, not on raw events, so it cannot fire on its own. Deploy the rules it depends on too.

Depends on

Raw source ET WEB_SPECIFIC_APPS N-able N-central Session ID Disclosure · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $HOME_NET any -> any any (
    msg:"ET WEB_SPECIFIC_APPS N-able N-central Session ID Disclosure";
    flow:established,to_client;
    flowbits:isset,ET.N_able_N_central.CVE_2025_9316;
    http.response_body;
    content:"ns1|3a|sessionHelloResponse"; fast_pattern;
    content:"|3c 2f|sessionid|3e|"; nocase; distance:0;
    pcre:"/\x3e\d+\x3c\x2fsessionid\x3e/i";
    http.stat_code;
    content:"200";
    reference:url,horizon3.ai/attack-research/attack-blogs/n-able-n-central-from-n-days-to-0-days/;
    classtype:web-application-attack;
    sid:2065914; rev:1;
    metadata:affected_product N_Able, attack_target Server, tls_state TLSDecrypt, created_at 2025_11_25, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Minor, updated_at 2025_11_25, mitre_tactic_id TA0007, mitre_tactic_name Discovery, mitre_technique_id T1082, mitre_technique_name System_Information_Discovery;
    target:dest_ip;
)

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