ET WEB_SPECIFIC_APPS Citrix StoreFront XML Parsing Exception Response (CVE-2023-5914)

Query · suricata

flow:established,to_client;
flowbits:isset,ET.Citrix.CVE_2023_5914;
http.response_body;
content:"System.Xml.XmlException";
pcre:"/^(?:(?!\x3c\x2fdiv\x3e).)+(?:on(?:(?:s(?:elec|ubmi)|rese)t|d(?:blclick|ragdrop)|(?:mouse|key)[a-z]+|c(?:hange|lick)|(?:un)?load|focus|blur|error)|s(?:cript|tyle\x3d))/R";
http.cookie;
content:"Citrix_AuthSvc|3d|";
content:"path=/Citrix/teststoreAuth"; fast_pattern;
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 Citrix StoreFront XML Parsing Exception Response (CVE-2023-5914) · Suricata
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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 Citrix StoreFront XML Parsing Exception Response (CVE-2023-5914)";
    flow:established,to_client;
    flowbits:isset,ET.Citrix.CVE_2023_5914;
    http.response_body;
    content:"System.Xml.XmlException";
    pcre:"/^(?:(?!\x3c\x2fdiv\x3e).)+(?:on(?:(?:s(?:elec|ubmi)|rese)t|d(?:blclick|ragdrop)|(?:mouse|key)[a-z]+|c(?:hange|lick)|(?:un)?load|focus|blur|error)|s(?:cript|tyle\x3d))/R";
    http.cookie;
    content:"Citrix_AuthSvc|3d|";
    content:"path=/Citrix/teststoreAuth"; fast_pattern;
    http.stat_code;
    content:"200";
    reference:url,www.assetnote.io/resources/research/continuing-the-citrix-saga-cve-2023-5914-cve-2023-6184;
    classtype:web-application-attack;
    sid:2065779; rev:1;
    metadata:affected_product Citrix, attack_target Server, tls_state TLSDecrypt, created_at 2025_11_14, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, tag Exploit, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_11_14, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)

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