CVE-2025-69277

# CVE-2025-69277 PoC - libsodium crypto_core_ed25519_is_valid_point bypass # This PoC demonstrates the validation issue with invalid curve points from nacl.bindings import crypto_core_ed25519_is_valid_point import nacl.exceptions def test_point_validation(): """ Test cases for Ed25519 point validation vulnerability. The vulnerable version may incorrectly accept points not in the main group. """ # Valid point (generator point in compressed format) # This should always be accepted valid_point = bytes.fromhex( '5866666666666666666666666666666666666666666666666666666666666666c0' ) # Small order point example (may be incorrectly accepted in vulnerable version) # This is a point with small order, not in the main cryptographic group small_order_point = bytes.fromhex( '0000000000000000000000000000000000000000000000000000000000000000' ) print("Testing libsodium crypto_core_ed25519_is_valid_point...") # Test 1: Valid point should be accepted try: result1 = crypto_core_ed25519_is_valid_point(valid_point) print(f"Valid point test: {'PASS' if result1 else 'FAIL'}") except Exception as e: print(f"Valid point test: ERROR - {e}") # Test 2: Zero point (neutral element) - should be rejected try: result2 = crypto_core_ed25519_is_valid_point(small_order_point) if result2: print("WARNING: Zero point incorrectly accepted (vulnerable behavior)") else: print("Zero point test: CORRECTLY REJECTED") except nacl.exceptions.CryptoError: print("Zero point test: CORRECTLY REJECTED (exception thrown)") except Exception as e: print(f"Zero point test: ERROR - {e}") if __name__ == "__main__": test_point_validation()

{"cve": {"id": "CVE-2025-69277", "sourceIdentifier": "[email protected]", "published": "2025-12-31T06:15:41.513", "lastModified": "2026-04-15T00:35:42.020", "vulnStatus": "Deferred", "cveTags": [], "descriptions": [{"lang": "en", "value": "libsodium before ad3004e, in atypical use cases involving certain custom cryptography or untrusted data to crypto_core_ed25519_is_valid_point, mishandles checks for whether an elliptic curve point is valid because it sometimes allows points that aren't in the main cryptographic group."}, {"lang": "es", "value": "libsodium antes de ad3004e, en casos de uso atípicos que involucran cierta criptografía personalizada o datos no confiables para crypto_core_ed25519_is_valid_point, maneja incorrectamente las comprobaciones sobre si un punto de curva elíptica es válido porque a veces permite puntos que no están en el grupo criptográfico principal."}], "metrics": {"cvssMetricV31": [{"source": "[email protected]", "type": "Secondary", "cvssData": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N", "baseScore": 4.5, "baseSeverity": "MEDIUM", "attackVector": "LOCAL", "attackComplexity": "HIGH", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "LOW", "integrityImpact": "LOW", "availabilityImpact": "NONE"}, "exploitabilityScore": 1.4, "impactScore": 2.7}]}, "weaknesses": [{"source": "[email protected]", "type": "Secondary", "description": [{"lang": "en", "value": "CWE-184"}]}], "references": [{"url": "https://00f.net/2025/12/30/libsodium-vulnerability/", "source": "[email protected]"}, {"url": "https://github.com/jedisct1/libsodium/commit/ad3004ec8731730e93fcfbbc824e67eadc1c1bae", "source": "[email protected]"}, {"url": "https://github.com/pyca/pynacl/commit/96314884d88d1089ff5f336dba61d7abbcddbbf7", "source": "[email protected]"}, {"url": "https://github.com/pyca/pynacl/commit/ecf41f55a3d8f1e10ce89c61c4b4d67f3f4467cf", "source": "[email protected]"}, {"url": "https://github.com/pyca/pynacl/issues/920", "source": "[email protected]"}, {"url": "https://ianix.com/pub/ed25519-deployment.html", "source": "[email protected]"}, {"url": "https://news.ycombinator.com/item?id=46435614", "source": "[email protected]"}, {"url": "https://lists.debian.org/debian-lts-announce/2026/01/msg00004.html", "source": "af854a3a-2127-422b-91ae-364da2661108"}]}}