ET WEB_SPECIFIC_APPS xml-crypto SAML Authentication Bypass Multiple SignedInfo References (CVE-2025-29774)

alert http $EXTERNAL_NET any -> $HOME_NET any (
    msg:"ET WEB_SPECIFIC_APPS xml-crypto SAML Authentication Bypass Multiple SignedInfo References (CVE-2025-29774)";
    flow:established,to_server;
    http.method;
    content:"POST";
    http.request_body;
    content:"SAMLResponse|3d|"; fast_pattern;
    base64_decode:offset 0, relative;
    base64_data;
    content:"|3c|saml2p|3a|Response";
    content:"|3c|SignedInfo|3e|";
    content:"|3c|SignedInfo|3e|"; distance:0;
    reference:url,github.com/node-saml/xml-crypto/security/advisories/GHSA-9p8x-f768-wp2g;
    reference:cve,2025-29774;
    classtype:web-application-attack;
    sid:2060961; rev:2;
    metadata:attack_target Server, tls_state TLSDecrypt, created_at 2025_03_19, cve CVE_2025_29774, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence Medium, signature_severity Major, tag Exploit, updated_at 2025_03_25, reviewed_at 2025_08_26, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)