ET EXPLOIT Citrix ADC and NetScaler Gateway Information Disclosure - Successful Response (CVE-2023-4966)

Query · suricata

flow:established,to_client;
flowbits:isset,ET.CVE-2023-4966.LeakAttempt;
http.stat_code;
content:"200";
http.content_type;
content:"application/json"; startswith;
http.response_body;
content:"|7b 22|issuer|22 3a 20 22|http"; startswith; fast_pattern;
content:!"|22 2c 20 22|authorization_endpoint"; within:20000;
target:src_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 EXPLOIT Citrix ADC and NetScaler Gateway Information Disclosure - Successful Response (CVE-2023-4966) · 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 -> $EXTERNAL_NET any (
    msg:"ET EXPLOIT Citrix ADC and NetScaler Gateway Information Disclosure - Successful Response (CVE-2023-4966)";
    flow:established,to_client;
    flowbits:isset,ET.CVE-2023-4966.LeakAttempt;
    http.stat_code;
    content:"200";
    http.content_type;
    content:"application/json"; startswith;
    http.response_body;
    content:"|7b 22|issuer|22 3a 20 22|http"; startswith; fast_pattern;
    content:!"|22 2c 20 22|authorization_endpoint"; within:20000;
    reference:url,www.assetnote.io/resources/research/citrix-bleed-leaking-session-tokens-with-cve-2023-4966;
    reference:cve,2023-4966;
    classtype:successful-admin;
    sid:2048932; rev:1;
    metadata:attack_target Web_Server, created_at 2023_10_29, cve CVE_2023_4966, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Critical, tag CISA_KEV, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_10_29, reviewed_at 2023_10_29, mitre_tactic_id TA0007, mitre_tactic_name Discovery, mitre_technique_id T1082, mitre_technique_name System_Information_Discovery;
    target:src_ip;
)

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