SUMMARY = "Updates the NVD CVE database" LICENSE = "MIT" INHIBIT_DEFAULT_DEPS = "1" inherit native deltask do_unpack deltask do_patch deltask do_configure deltask do_compile deltask do_install deltask do_populate_sysroot NVDCVE_URL ?= "https://nvd.nist.gov/feeds/json/cve/1.1/nvdcve-1.1-" python () { if not bb.data.inherits_class("cve-check", d): raise bb.parse.SkipRecipe("Skip recipe when cve-check class is not loaded.") } python do_fetch() { """ Update NVD database with json data feed """ import bb.utils import bb.progress import sqlite3, urllib, urllib.parse, gzip from datetime import date bb.utils.export_proxies(d) YEAR_START = 2002 db_file = d.getVar("CVE_CHECK_DB_FILE") db_dir = os.path.dirname(db_file) if os.path.exists("{0}-journal".format(db_file)): # If a journal is present the last update might have been interrupted. In that case, # just wipe any leftovers and force the DB to be recreated. os.remove("{0}-journal".format(db_file)) if os.path.exists(db_file): os.remove(db_file) # Don't refresh the database more than once an hour try: import time if time.time() - os.path.getmtime(db_file) < (60*60): bb.debug(2, "Recently updated, skipping") return except OSError: pass bb.utils.mkdirhier(db_dir) # Connect to database conn = sqlite3.connect(db_file) c = conn.cursor() initialize_db(c) with bb.progress.ProgressHandler(d) as ph, open(os.path.join(d.getVar("TMPDIR"), 'cve_check'), 'a') as cve_f: total_years = date.today().year + 1 - YEAR_START 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" # Retrieve meta last modified date try: response = urllib.request.urlopen(meta_url) except urllib.error.URLError as e: cve_f.write('Warning: CVE db update error, Unable to fetch CVE data.\n\n') bb.warn("Failed to fetch CVE data (%s)" % e.reason) return if response: for l in response.read().decode("utf-8").splitlines(): key, value = l.split(":", 1) if key == "lastModifiedDate": last_modified = value break else: bb.warn("Cannot parse CVE metadata, update failed") return # Compare with current db last modified date c.execute("select DATE from META where YEAR = ?", (year,)) meta = c.fetchone() if not meta or meta[0] != last_modified: bb.debug(2, "Updating entries") # Clear products table entries corresponding to current year c.execute("delete from PRODUCTS where ID like ?", ('CVE-%d%%' % year,)) # Update db with current year json file try: response = urllib.request.urlopen(json_url) if response: update_db(c, gzip.decompress(response.read()).decode('utf-8')) c.execute("insert or replace into META values (?, ?)", [year, last_modified]) except urllib.error.URLError as e: cve_f.write('Warning: CVE db update error, CVE data is outdated.\n\n') bb.warn("Cannot parse CVE data (%s), update failed" % e.reason) return else: bb.debug(2, "Already up to date (last modified %s)" % last_modified) # Update success, set the date to cve_check file. if year == date.today().year: cve_f.write('CVE database update : %s\n\n' % date.today()) conn.commit() conn.close() } do_fetch[lockfiles] += "${CVE_CHECK_DB_FILE_LOCK}" do_fetch[file-checksums] = "" do_fetch[vardeps] = "" def initialize_db(c): c.execute("CREATE TABLE IF NOT EXISTS META (YEAR INTEGER UNIQUE, DATE TEXT)") c.execute("CREATE TABLE IF NOT EXISTS NVD (ID TEXT UNIQUE, SUMMARY TEXT, \ SCOREV2 TEXT, SCOREV3 TEXT, MODIFIED INTEGER, VECTOR TEXT)") c.execute("CREATE TABLE IF NOT EXISTS PRODUCTS (ID TEXT, \ VENDOR TEXT, PRODUCT TEXT, VERSION_START TEXT, OPERATOR_START TEXT, \ VERSION_END TEXT, OPERATOR_END TEXT)") c.execute("CREATE INDEX IF NOT EXISTS PRODUCT_ID_IDX on PRODUCTS(ID);") def parse_node_and_insert(c, node, cveId): # Parse children node if needed for child in node.get('children', ()): parse_node_and_insert(c, child, cveId) def cpe_generator(): for cpe in node.get('cpe_match', ()): if not cpe['vulnerable']: return cpe23 = cpe.get('cpe23Uri') if not cpe23: return cpe23 = cpe23.split(':') if len(cpe23) < 6: return vendor = cpe23[3] product = cpe23[4] version = cpe23[5] if cpe23[6] == '*' or cpe23[6] == '-': version_suffix = "" else: version_suffix = "_" + cpe23[6] if version != '*' and version != '-': # Version is defined, this is a '=' match yield [cveId, vendor, product, version + version_suffix, '=', '', ''] elif version == '-': # no version information is available yield [cveId, vendor, product, version, '', '', ''] else: # Parse start version, end version and operators op_start = '' op_end = '' v_start = '' v_end = '' if 'versionStartIncluding' in cpe: op_start = '>=' v_start = cpe['versionStartIncluding'] if 'versionStartExcluding' in cpe: op_start = '>' v_start = cpe['versionStartExcluding'] if 'versionEndIncluding' in cpe: op_end = '<=' v_end = cpe['versionEndIncluding'] if 'versionEndExcluding' in cpe: op_end = '<' v_end = cpe['versionEndExcluding'] if op_start or op_end or v_start or v_end: yield [cveId, vendor, product, v_start, op_start, v_end, op_end] else: # This is no version information, expressed differently. # Save processing by representing as -. yield [cveId, vendor, product, '-', '', '', ''] c.executemany("insert into PRODUCTS values (?, ?, ?, ?, ?, ?, ?)", cpe_generator()) def update_db(c, jsondata): import json root = json.loads(jsondata) for elt in root['CVE_Items']: if not elt['impact']: continue accessVector = None cveId = elt['cve']['CVE_data_meta']['ID'] cveDesc = elt['cve']['description']['description_data'][0]['value'] date = elt['lastModifiedDate'] try: accessVector = elt['impact']['baseMetricV2']['cvssV2']['accessVector'] cvssv2 = elt['impact']['baseMetricV2']['cvssV2']['baseScore'] except KeyError: cvssv2 = 0.0 try: accessVector = accessVector or elt['impact']['baseMetricV3']['cvssV3']['attackVector'] cvssv3 = elt['impact']['baseMetricV3']['cvssV3']['baseScore'] except KeyError: accessVector = accessVector or "UNKNOWN" cvssv3 = 0.0 c.execute("insert or replace into NVD values (?, ?, ?, ?, ?, ?)", [cveId, cveDesc, cvssv2, cvssv3, date, accessVector]) configurations = elt['configurations']['nodes'] for config in configurations: parse_node_and_insert(c, config, cveId) do_fetch[nostamp] = "1" EXCLUDE_FROM_WORLD = "1"