From 78fd620ec816a21ca797adb3c8c5389a5809d4bc Mon Sep 17 00:00:00 2001 From: Alexandre Dulaunoy Date: Thu, 29 Oct 2026 18:07:22 +0100 Subject: [PATCH 1/2] feat: [greynoise_vuln] add dedicated CVE intelligence lookups --- documentation/expansion/greynoise_vuln.md | 11 ++ .../modules/expansion/greynoise_vuln.py | 165 ++++++++++++++++++ tests/test_greynoise_vuln.py | 105 +++++++++++ 3 files changed, 281 insertions(+) create mode 100644 documentation/expansion/greynoise_vuln.md create mode 100644 misp_modules/modules/expansion/greynoise_vuln.py create mode 100644 tests/test_greynoise_vuln.py diff --git a/documentation/expansion/greynoise_vuln.md b/documentation/expansion/greynoise_vuln.md new file mode 100644 index 00000000..9358d247 --- /dev/null +++ b/documentation/expansion/greynoise_vuln.md @@ -0,0 +1,11 @@ +# GreyNoise Vulnerability Intelligence + +Retrieve dedicated GreyNoise CVE intelligence, including available exploitation activity, exploit counts, product details and prioritization fields. Provider fields are preserved in a referenced annotation. Coverage depends on the API key entitlement. An absent CVE returns no enrichment and does not imply no exploitation. + +Input: vulnerability. + +Configuration: api_key, max_results. Required: api_key. + +max_results defaults to 25 and accepts 1–100. New attributes use `to_ids=false`; the source UUID, detection flag and metadata are preserved. Objects reference the source attribute. Requests verify TLS, reject redirects and use connection/read timeouts of 5/30 seconds. API errors do not echo credentials. No automatic submission retries or background polling occur. + +Reference: https://docs.greynoise.io/reference/getcve diff --git a/misp_modules/modules/expansion/greynoise_vuln.py b/misp_modules/modules/expansion/greynoise_vuln.py new file mode 100644 index 00000000..4027a6c3 --- /dev/null +++ b/misp_modules/modules/expansion/greynoise_vuln.py @@ -0,0 +1,165 @@ +import ipaddress +import json +import re +import zipfile +from uuid import UUID +import requests +from pymisp import MISPEvent, MISPObject +from pymisp.exceptions import PyMISPError + + +class ModuleError(ValueError): + """A diagnostic safe to show to the analyst.""" + + +def _integer(config, key, default, maximum=100): + value = config.get(key) + if value is None or value == "": + return default + if isinstance(value, bool) or not str(value).isdigit() or (not 1 <= int(value) <= maximum): + raise ModuleError(f"{key} must be an integer between 1 and {maximum}.") + return int(value) + + +def _normalise(kind, value): + if not isinstance(value, str) or not value.strip() or any(ord(c) < 32 for c in value): + raise ModuleError("A nonempty string value is required.") + value = value.strip() + if kind in ("md5", "sha1", "sha256", "x509-fingerprint-sha256"): + length = {"md5": 32, "sha1": 40}.get(kind, 64) + if not re.fullmatch("[a-fA-F0-9]{%d}" % length, value): + raise ModuleError("Invalid hash.") + return value.lower() + if kind in ("ip-src", "ip-dst"): + return str(ipaddress.ip_address(value)) + if kind in ("domain", "hostname"): + value = value.rstrip(".").encode("idna").decode("ascii").lower() + if len(value) > 253 or not all( + re.fullmatch("[a-z0-9](?:[a-z0-9-]{0,61}[a-z0-9])?", p) for p in value.split(".") + ): + raise ModuleError("Invalid DNS name.") + if kind == "vulnerability": + value = value.upper() + if not re.fullmatch("CVE-[0-9]{4}-[0-9]{4,}", value): + raise ModuleError("A CVE identifier is required.") + return value + + +def _call(method, url, **kwargs): + try: + response = requests.request(method, url, timeout=(5, 30), verify=True, allow_redirects=False, **kwargs) + except requests.RequestException: + raise ModuleError( + "The service request failed or timed out; check the service before repeating a submission." + ) from None + if response.status_code in (204, 404) and method == "GET": + return None + if response.status_code not in (200, 201, 202): + raise ModuleError(f"The service returned HTTP {response.status_code}.") + try: + return response.json() + except ValueError: + raise ModuleError("The service returned invalid JSON.") from None + + +def _object(event, attribute, name): + obj = MISPObject(name) + obj.add_reference(attribute["uuid"], "describes") + event.add_object(obj) + return obj + + +def _annotation(event, attribute, title, data): + obj = _object(event, attribute, "annotation") + obj.comment = title + obj.add_attribute("text", value=json.dumps(data, sort_keys=True), to_ids=False, disable_correlation=True) + return obj + + +def handler(q=False): + if q is False: + return False + try: + request = json.loads(q) + if not isinstance(request, dict) or not isinstance(request.get("attribute"), dict): + raise ModuleError("An attribute containing type, value and uuid is required.") + attribute = request["attribute"] + UUID(attribute["uuid"]) + if attribute["type"] not in mispattributes["input"]: + raise ModuleError("Unsupported attribute type.") + value = _normalise(attribute["type"], attribute["value"]) + config = request.get("config") or {} + if not isinstance(config, dict): + raise ModuleError("The config must be an object.") + for key in REQUIRED: + if not isinstance(config.get(key), str) or not config[key].strip(): + raise ModuleError(f"Missing {key} configuration.") + limit = _integer(config, "max_results", 25) + event = MISPEvent() + event.add_attribute(**attribute) + _expand(event, attribute, value, config, limit) + result = json.loads(event.to_json()) + return {"results": {key: result.get(key, []) for key in ("Attribute", "Object")}} + except ModuleError as exc: + return {"error": str(exc)} + except ( + ValueError, + TypeError, + KeyError, + AttributeError, + IndexError, + OSError, + RuntimeError, + zipfile.BadZipFile, + PyMISPError, + ): + return {"error": "Invalid request or service response."} + + +def introspection(): + return mispattributes + + +def version(): + return dict(moduleinfo, config=moduleconfig) + + +moduleinfo = { + "version": "1.0", + "author": "MISP Project", + "name": "GreyNoise Vulnerability Intelligence", + "description": ( + "Retrieve dedicated GreyNoise CVE intelligence, including available exploitation activity, exploit counts," + " product details and prioritization fields. Provider fields are preserved in a referenced annotation. Coverage" + " depends on the API key entitlement. An absent CVE returns no enrichment and does not imply no exploitation." + ), + "module-type": ["expansion"], + "data-source": "external", + "logo": "", + "requirements": ["requests", "pymisp"], + "features": ( + "Retrieve dedicated GreyNoise CVE intelligence, including available exploitation activity, exploit counts," + " product details and prioritization fields. Provider fields are preserved in a referenced annotation. Coverage" + " depends on the API key entitlement. An absent CVE returns no enrichment and does not imply no exploitation." + ), + "references": ["https://docs.greynoise.io/reference/getcve"], + "input": "vulnerability", + "output": "MISP objects linked to the original attribute.", +} +mispattributes = {"input": ["vulnerability"], "format": "misp_standard"} +moduleconfig = ["api_key", "max_results"] +REQUIRED = ["api_key"] + + +def _expand(event, attribute, value, config, limit): + data = _call( + "GET", + "https://api.greynoise.io/v1/cve/" + value, + headers={"key": config["api_key"], "Accept": "application/json"}, + ) + if data is None: + return + if not isinstance(data, dict): + raise ModuleError("GreyNoise returned invalid vulnerability data.") + if data: + _annotation(event, attribute, moduleinfo["name"], data) diff --git a/tests/test_greynoise_vuln.py b/tests/test_greynoise_vuln.py new file mode 100644 index 00000000..929b7839 --- /dev/null +++ b/tests/test_greynoise_vuln.py @@ -0,0 +1,105 @@ +import json +from unittest.mock import Mock, patch + +import pytest +import requests + +from misp_modules.modules.expansion import greynoise_vuln as module + +UUID = "32876e4a-916d-4935-9e51-7b69a76718f8" +SECRET = "test-service-secret" + + +def query(kind=None, value="example.com", config=None, **attribute_fields): + attribute = { + "type": kind or module.mispattributes["input"][0], + "value": value, + "uuid": UUID, + "to_ids": True, + "comment": "source context", + **attribute_fields, + } + return json.dumps( + {"attribute": attribute, "config": config if config is not None else {k: SECRET for k in module.REQUIRED}} + ) + + +def reply(payload=None, status=200): + return Mock(status_code=status, headers={}, json=Mock(return_value=payload)) + + +def assert_source(result): + assert "results" in result, result + source = next(a for a in result["results"]["Attribute"] if a["uuid"] == UUID) + assert source["to_ids"] is True + assert source["comment"] == "source context" + for obj in result["results"]["Object"]: + assert any(r["referenced_uuid"] == UUID for r in obj["ObjectReference"]) + assert all(a["to_ids"] is False for a in obj["Attribute"]) + + +def objects(result, name): + return [obj for obj in result["results"]["Object"] if obj["name"] == name] + + +def values(obj, relation): + return [a["value"] for a in obj["Attribute"] if a["object_relation"] == relation] + + +def test_discovery(): + assert module.handler(False) is False + assert module.introspection()["format"] == "misp_standard" + assert module.version()["config"] == module.moduleconfig + + +@pytest.mark.parametrize("raw", ["{", "[]", "null", "{}", '{"attribute": []}']) +def test_invalid_envelope(raw): + with patch.object(module.requests, "request") as request: + assert "error" in module.handler(raw) + request.assert_not_called() + + +@pytest.mark.parametrize("status", [301, 401, 403, 429, 503]) +def test_http_errors_are_sanitized(status): + with patch.object(module.requests, "request", return_value=reply({"error": SECRET}, status)): + with pytest.raises(module.ModuleError) as failure: + module._call("GET", "https://service.example/report") + assert str(status) in str(failure.value) + assert SECRET not in str(failure.value) + + +def test_timeout_is_bounded_and_sanitized(): + with patch.object(module.requests, "request", side_effect=requests.Timeout(SECRET)) as request: + with pytest.raises(module.ModuleError) as failure: + module._call("POST", "https://service.example/submit") + assert SECRET not in str(failure.value) + assert request.call_count == 1 + assert request.call_args.kwargs["verify"] is True + assert request.call_args.kwargs["allow_redirects"] is False + assert request.call_args.kwargs["timeout"] == (5, 30) + + +@pytest.mark.parametrize("raw", [0, -1, True, "bad", 101]) +def test_invalid_result_limit(raw): + with pytest.raises(module.ModuleError): + module._integer({"max_results": raw}, "max_results", 25) + + +def test_cve_details_keep_zero_and_false(): + data = { + "exploitation_activity": {"activity_seen": False}, + "exploitation_stats": {"number_of_available_exploits": 0}, + "details": {"cve_id": "CVE-2024-1234"}, + } + with patch.object(module.requests, "request", return_value=reply(data)) as request: + result = module.handler(query(kind="vulnerability", value="cve-2024-1234")) + assert_source(result) + assert request.call_args.args[1].endswith("/CVE-2024-1234") + assert json.loads(values(objects(result, "annotation")[0], "text")[0]) == data + + +def test_unknown_cve_is_not_a_benign_assertion(): + with patch.object(module.requests, "request", return_value=reply(status=404)): + result = module.handler(query(kind="vulnerability", value="CVE-2024-1234")) + assert_source(result) + assert not result["results"]["Object"] From 4930d91a8a3fa0ec523639d5ec860aef4c20df84 Mon Sep 17 00:00:00 2001 From: Alexandre Dulaunoy Date: Thu, 29 Oct 2026 23:23:15 +0100 Subject: [PATCH 2/2] fix: [greynoise_vuln] address review findings --- documentation/expansion/greynoise_vuln.md | 6 ++++-- misp_modules/modules/expansion/greynoise_vuln.py | 4 ++-- 2 files changed, 6 insertions(+), 4 deletions(-) diff --git a/documentation/expansion/greynoise_vuln.md b/documentation/expansion/greynoise_vuln.md index 9358d247..82e38938 100644 --- a/documentation/expansion/greynoise_vuln.md +++ b/documentation/expansion/greynoise_vuln.md @@ -4,8 +4,10 @@ Retrieve dedicated GreyNoise CVE intelligence, including available exploitation Input: vulnerability. -Configuration: api_key, max_results. Required: api_key. +Configuration: api_key. Required: api_key. -max_results defaults to 25 and accepts 1–100. New attributes use `to_ids=false`; the source UUID, detection flag and metadata are preserved. Objects reference the source attribute. Requests verify TLS, reject redirects and use connection/read timeouts of 5/30 seconds. API errors do not echo credentials. No automatic submission retries or background polling occur. +New attributes use `to_ids=false`; the source UUID, detection flag and metadata are preserved. Objects reference the source attribute. Requests verify TLS, reject redirects and use connection/read timeouts of 5/30 seconds. API errors do not echo credentials. No automatic submission retries or background polling occur. Reference: https://docs.greynoise.io/reference/getcve + +One complete provider report is retained per lookup; there is no result-count setting. diff --git a/misp_modules/modules/expansion/greynoise_vuln.py b/misp_modules/modules/expansion/greynoise_vuln.py index 4027a6c3..b2d68ec1 100644 --- a/misp_modules/modules/expansion/greynoise_vuln.py +++ b/misp_modules/modules/expansion/greynoise_vuln.py @@ -94,7 +94,7 @@ def handler(q=False): for key in REQUIRED: if not isinstance(config.get(key), str) or not config[key].strip(): raise ModuleError(f"Missing {key} configuration.") - limit = _integer(config, "max_results", 25) + limit = 25 event = MISPEvent() event.add_attribute(**attribute) _expand(event, attribute, value, config, limit) @@ -147,7 +147,7 @@ def version(): "output": "MISP objects linked to the original attribute.", } mispattributes = {"input": ["vulnerability"], "format": "misp_standard"} -moduleconfig = ["api_key", "max_results"] +moduleconfig = ["api_key"] REQUIRED = ["api_key"]