Add support for FKIE-CAD reconstruction of NVD feed from https://github.com/fkie-cad/nvd-json-data-feeds
We download this feed directly from github releases. Signed-off-by: Marta Rybczynska <marta.rybczyn...@ygreky.com> --- .../recipes-core/meta/cve-update-db-native.bb | 126 ++++++++++++++++-- 1 file changed, 113 insertions(+), 13 deletions(-) diff --git a/meta/recipes-core/meta/cve-update-db-native.bb b/meta/recipes-core/meta/cve-update-db-native.bb index f16e79ff58..b889c9e6a7 100644 --- a/meta/recipes-core/meta/cve-update-db-native.bb +++ b/meta/recipes-core/meta/cve-update-db-native.bb @@ -12,6 +12,8 @@ deltask do_install deltask do_populate_sysroot NVDCVE_URL ?= "https://nvd.nist.gov/feeds/json/cve/1.1/nvdcve-1.1-"; +FKIE_URL ?= "https://github.com/fkie-cad/nvd-json-data-feeds/releases/latest/download/CVE-"; + # CVE database update interval, in seconds. By default: once a day (24*60*60). # Use 0 to force the update # Use a negative value to skip the update @@ -109,6 +111,30 @@ def cleanup_db_download(db_file, db_tmp_file): if os.path.exists(db_tmp_file): os.remove(db_tmp_file) +def db_file_names(d, year, is_nvd): + if is_nvd: + year_url = d.getVar('NVDCVE_URL') + str(year) + meta_url = year_url + ".meta" + json_url = year_url + ".json.gz" + return json_url, meta_url + year_url = d.getVar('FKIE_URL') + str(year) + meta_url = year_url + ".meta" + json_url = year_url + ".json.xz" + return json_url, meta_url + +def host_db_name(d, is_nvd): + if is_nvd: + return "nvd.nist.gov" + return "github.com" + +def db_decompress(d, data, is_nvd): + import gzip, lzma + + if is_nvd: + return gzip.decompress(data).decode('utf-8') + # otherwise + return lzma.decompress(data) + def update_db_file(db_tmp_file, d): """ Update the given database file @@ -119,6 +145,7 @@ def update_db_file(db_tmp_file, d): YEAR_START = 2002 cve_socket_timeout = int(d.getVar("CVE_SOCKET_TIMEOUT")) + is_nvd = d.getVar("NVD_DB_VERSION") == "NVD1" # Connect to database conn = sqlite3.connect(db_tmp_file) @@ -129,9 +156,7 @@ def update_db_file(db_tmp_file, d): for i, year in enumerate(range(YEAR_START, date.today().year + 1)): bb.debug(2, "Updating %d" % year) ph.update((float(i + 1) / total_years) * 100) - year_url = (d.getVar('NVDCVE_URL')) + str(year) - meta_url = year_url + ".meta" - json_url = year_url + ".json.gz" + json_url, meta_url = db_file_names(d, year, is_nvd) # Retrieve meta last modified date try: @@ -140,7 +165,7 @@ def update_db_file(db_tmp_file, d): cve_f.write('Warning: CVE db update error, Unable to fetch CVE data.\n\n') bb.warn("Failed to fetch CVE data (%s)" % e) import socket - result = socket.getaddrinfo("nvd.nist.gov", 443, proto=socket.IPPROTO_TCP) + result = socket.getaddrinfo(host_db_name(d, is_nvd), 443, proto=socket.IPPROTO_TCP) bb.warn("Host IPs are %s" % (", ".join(t[4][0] for t in result))) return False @@ -168,7 +193,7 @@ def update_db_file(db_tmp_file, d): try: response = urllib.request.urlopen(json_url, timeout=cve_socket_timeout) if response: - update_db(conn, gzip.decompress(response.read()).decode('utf-8')) + update_db(d, conn, db_decompress(d, response.read(), is_nvd)) conn.execute("insert or replace into META values (?, ?)", [year, last_modified]).close() except urllib.error.URLError as e: cve_f.write('Warning: CVE db update error, CVE data is outdated.\n\n') @@ -200,16 +225,22 @@ def initialize_db(conn): c.close() -def parse_node_and_insert(conn, node, cveId): +def parse_node_and_insert(conn, node, cveId, is_nvd): # Parse children node if needed for child in node.get('children', ()): - parse_node_and_insert(conn, child, cveId) + parse_node_and_insert(conn, child, cveId, is_nvd) + + def cpe_generator(is_nvd): + match_string = "cpeMatch" + cpe_string = 'criteria' + if is_nvd: + match_string = "cpe_match" + cpe_string = 'cpe23Uri' - def cpe_generator(): - for cpe in node.get('cpe_match', ()): + for cpe in node.get(match_string, ()): if not cpe['vulnerable']: return - cpe23 = cpe.get('cpe23Uri') + cpe23 = cpe.get(cpe_string) if not cpe23: return cpe23 = cpe23.split(':') @@ -260,9 +291,9 @@ def parse_node_and_insert(conn, node, cveId): # Save processing by representing as -. yield [cveId, vendor, product, '-', '', '', ''] - conn.executemany("insert into PRODUCTS values (?, ?, ?, ?, ?, ?, ?)", cpe_generator()).close() + conn.executemany("insert into PRODUCTS values (?, ?, ?, ?, ?, ?, ?)", cpe_generator(is_nvd)).close() -def update_db(conn, jsondata): +def update_db_nvdjson(conn, jsondata): import json root = json.loads(jsondata) @@ -297,8 +328,77 @@ def update_db(conn, jsondata): configurations = elt['configurations']['nodes'] for config in configurations: - parse_node_and_insert(conn, config, cveId) + parse_node_and_insert(conn, config, cveId, True) + +def update_db_fkie(conn, jsondata): + import json + root = json.loads(jsondata) + + for elt in root['cve_items']: + if not 'vulnStatus' in elt or elt['vulnStatus'] == 'Rejected': + continue + + if not 'configurations' in elt: + continue + + accessVector = None + vectorString = None + cvssv2 = 0.0 + cvssv3 = 0.0 + cvssv4 = 0.0 + cveId = elt['id'] + cveDesc = elt['descriptions'][0]['value'] + date = elt['lastModified'] + try: + for m in elt['metrics']['cvssMetricV2']: + if m['type'] == 'Primary': + accessVector = m['cvssData']['accessVector'] + vectorString = m['cvssData']['vectorString'] + cvssv2 = m['cvssData']['baseScore'] + except KeyError: + cvssv2 = 0.0 + try: + for m in elt['metrics']['cvssMetricV30']: + if m['type'] == 'Primary': + accessVector = m['cvssData']['accessVector'] + vectorString = m['cvssData']['vectorString'] + cvssv3 = m['cvssData']['baseScore'] + except KeyError: + accessVector = accessVector or "UNKNOWN" + cvssv3 = 0.0 + try: + for m in elt['metrics']['cvssMetricV31']: + if m['type'] == 'Primary': + accessVector = m['cvssData']['accessVector'] + vectorString = m['cvssData']['vectorString'] + cvssv3 = m['cvssData']['baseScore'] + except KeyError: + accessVector = accessVector or "UNKNOWN" + cvssv3 = 0.0 + try: + for m in elt['metrics']['cvssMetricV40']: + if m['type'] == 'Primary': + accessVector = m['cvssData']['accessVector'] + vectorString = m['cvssData']['vectorString'] + cvssv4 = m['cvssData']['baseScore'] + except KeyError: + accessVector = accessVector or "UNKNOWN" + cvssv4 = 0.0 + conn.execute("insert or replace into NVD values (?, ?, ?, ?, ?, ?, ?, ?)", + [cveId, cveDesc, cvssv2, cvssv3, cvssv4, date, accessVector, vectorString]).close() + + for config in elt['configurations']: + # This is suboptimal as it doesn't handle AND/OR and negate, but is better than nothing + for node in config["nodes"]: + parse_node_and_insert(conn, node, cveId, False) + + +def update_db(d, conn, jsondata): + if (d.getVar("NVD_DB_VERSION") == "FKIE"): + return update_db_fkie(conn, jsondata) + else: + return update_db_nvdjson(conn, jsondata) do_fetch[nostamp] = "1" -- 2.45.2
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