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import json
import random
import sys
import unittest
from os import path
sys.path.insert(0, path.dirname(path.dirname(path.abspath(__file__))))
from cvss import parser
from cvss.cvss2 import CVSS2
from cvss.exceptions import (
CVSS2MalformedError,
CVSS2MandatoryError,
CVSS2RHMalformedError,
CVSS2RHScoreDoesNotMatch,
)
WD = path.dirname(path.abspath(sys.argv[0])) # Manage to run script anywhere in the path
class TestCVSS2(unittest.TestCase):
def run_tests_from_file(self, test_name):
with open(path.join(WD, test_name)) as f:
for line in f:
vector, expected_scores = line.split(" - ")
expected_scores = (
expected_scores.replace("(", "").replace(")", "").strip().split(", ")
)
expected_scores = tuple(float(a) if a != "None" else None for a in expected_scores)
result = CVSS2(vector)
results_scores = result.scores()
self.assertEqual(expected_scores, results_scores, test_name + " - " + vector)
def run_rh_tests_from_file(self, test_name):
with open(path.join(WD, test_name)) as f:
for line in f:
vector, expected_scores = line.split(" - ")
expected_scores = (
expected_scores.replace("(", "").replace(")", "").strip().split(", ")
)
expected_scores = tuple(float(a) if a != "None" else None for a in expected_scores)
tested_rh_vector = str(expected_scores[0]) + "/" + vector
result = CVSS2.from_rh_vector(tested_rh_vector)
results_scores = result.scores()
self.assertEqual(expected_scores, results_scores, test_name + " - " + vector)
def test_simple(self):
"""
All vector combinations with only mandatory fields, 729 vectors.
"""
self.run_tests_from_file("vectors_simple2")
def test_calculator(self):
"""
Hand picked vectors using https://nvd.nist.gov/CVSS-v2-Calculator . 3 vectors.
Another 2 vectors added based on Issue #10, one of them does not match the calculator.
"""
self.run_tests_from_file("vectors_calculator2")
def test_cvsslib(self):
"""
Tests which cvsslib from https://pypi.python.org/pypi/cvsslib uses. 24 vectors.
"""
self.run_tests_from_file("vectors_cvsslib2")
def test_random(self):
"""
Random generated test vectors, values computed using cvsslib from
https://pypi.python.org/pypi/cvsslib . 100,000 vectors.
"""
self.run_tests_from_file("vectors_random2")
def test_clean_vector(self):
"""
Tests for cleaning-up vector, where fields are not in order or some fields have ND values.
"""
v = "AV:A/AC:L/Au:M/C:C/I:P/A:C/E:ND/CDP:ND/TD:M/IR:H/AR:H"
self.assertEqual("AV:A/AC:L/Au:M/C:C/I:P/A:C/TD:M/IR:H/AR:H", CVSS2(v).clean_vector())
v = "AV:A/AC:H/Au:S/C:C/I:C/A:P/E:U/RL:U/RC:UR/CDP:ND/TD:ND/CR:L/IR:M/AR:ND"
self.assertEqual(
"AV:A/AC:H/Au:S/C:C/I:C/A:P/E:U/RL:U/RC:UR/CR:L/IR:M", CVSS2(v).clean_vector()
)
v = "AV:A/AC:H/Au:M/C:C/I:N/A:C/CR:ND/IR:L/RL:W/RC:ND/CDP:H/E:POC/TD:N/AR:M"
self.assertEqual(
"AV:A/AC:H/Au:M/C:C/I:N/A:C/E:POC/RL:W/CDP:H/TD:N/IR:L/AR:M", CVSS2(v).clean_vector()
)
def test_severities(self):
"""
Tests for computing severities.
"""
v = "AV:L/AC:H/Au:M/C:N/I:N/A:N"
self.assertEqual(("Low", "None", "None"), CVSS2(v).severities(), v)
v = "AV:L/AC:H/Au:M/C:P/I:N/A:N/E:U/RL:ND/RC:ND/CDP:N/TD:ND/CR:ND/IR:ND/AR:ND"
self.assertEqual(("Low", "Low", "Low"), CVSS2(v).severities(), v)
v = "AV:L/AC:H/Au:M/C:P/I:N/A:N/E:U/RL:OF/RC:ND/CDP:N/TD:ND/CR:L/IR:ND/AR:ND"
self.assertEqual(("Low", "Low", "Low"), CVSS2(v).severities(), v)
v = "AV:L/AC:H/Au:M/C:P/I:N/A:P/E:U/RL:OF/RC:UC/CDP:N/TD:N/CR:L/IR:L/AR:ND"
self.assertEqual(("Low", "Low", "Low"), CVSS2(v).severities(), v)
v = "AV:A/AC:M/Au:M/C:P/I:P/A:P/E:F/RL:W/RC:C/CDP:N/TD:ND/CR:ND/IR:ND/AR:ND"
self.assertEqual(("Medium", "Medium", "Medium"), CVSS2(v).severities(), v)
v = "AV:A/AC:M/Au:M/C:P/I:P/A:P/E:F/RL:U/RC:C/CDP:N/TD:N/CR:ND/IR:ND/AR:ND"
self.assertEqual(("Medium", "Medium", "Low"), CVSS2(v).severities(), v)
v = "AV:A/AC:M/Au:M/C:P/I:P/A:P/E:H/RL:U/RC:C/CDP:L/TD:L/CR:ND/IR:ND/AR:ND"
self.assertEqual(("Medium", "Medium", "Low"), CVSS2(v).severities(), v)
v = "AV:N/AC:L/Au:S/C:C/I:P/A:P/E:H/RL:U/RC:C/CDP:MH/TD:H/CR:ND/IR:ND/AR:ND"
self.assertEqual(("High", "High", "High"), CVSS2(v).severities(), v)
v = "AV:N/AC:L/Au:S/C:C/I:P/A:P/E:H/RL:U/RC:C/CDP:MH/TD:H/CR:ND/IR:ND/AR:ND"
self.assertEqual(("High", "High", "High"), CVSS2(v).severities(), v)
v = "AV:N/AC:L/Au:S/C:C/I:C/A:C/E:H/RL:U/RC:C/CDP:L/TD:M/CR:ND/IR:ND/AR:ND"
self.assertEqual(("High", "High", "Medium"), CVSS2(v).severities(), v)
v = "AV:A/AC:M/Au:S/C:P/I:P/A:P/E:U/RL:OF/RC:ND"
self.assertEqual(("Medium", "Low", "None"), CVSS2(v).severities(), v)
def test_exceptions(self):
"""
Test for exceptions in CVSS vector parsing.
"""
v = ""
self.assertRaises(CVSS2MalformedError, CVSS2, v)
v = "/"
self.assertRaises(CVSS2MalformedError, CVSS2, v)
# Missing ':'
v = "AV:A/AC:L/Au:M/C:C/I:P/A:C/TD:M/IR:H/ARH"
self.assertRaises(CVSS2MalformedError, CVSS2, v)
# Unknown metric
v = "AX:A/AC:L/Au:M/C:C/I:P/A:C/TD:M/IR:H/AR:H"
self.assertRaises(CVSS2MalformedError, CVSS2, v)
# Unknown value
v = "AV:W/AC:L/Au:M/C:C/I:P/A:C/TD:M/IR:H/AR:H"
self.assertRaises(CVSS2MalformedError, CVSS2, v)
# Duplicate metric
v = "AV:A/AV:A/AC:L/Au:M/C:C/I:P/A:C/TD:M/IR:H/AR:H"
self.assertRaises(CVSS2MalformedError, CVSS2, v)
# Duplicate metric
v = "AV:A/AV:L/AC:L/Au:M/C:C/I:P/A:C/TD:M/IR:H/AR:H"
self.assertRaises(CVSS2MalformedError, CVSS2, v)
# Missing mandatory
v = "AV:L/AC:L/Au:M/C:C/I:P/TD:M/IR:H/AR:H"
self.assertRaises(CVSS2MandatoryError, CVSS2, v)
# Empty field
v = "AV:L//Au:M/C:C/I:P/TD:M/IR:H/AR:H"
self.assertRaises(CVSS2MalformedError, CVSS2, v)
def test_rh_vector(self):
"""
Test for parsing Red Hat style of CVSS vectors, e.g. containing score.
"""
self.run_rh_tests_from_file("vectors_simple2")
# Bad values
v = "3.8/AV:L/AC:H/Au:M/C:C/I:N/A:N"
self.assertRaises(CVSS2RHScoreDoesNotMatch, CVSS2.from_rh_vector, v)
v = "6.0/AV:N/AC:L/Au:M/C:N/I:N/A:C"
self.assertRaises(CVSS2RHScoreDoesNotMatch, CVSS2.from_rh_vector, v)
v = "5.0/AV:L/AC:H/Au:M/C:C/I:P/A:P"
self.assertRaises(CVSS2RHScoreDoesNotMatch, CVSS2.from_rh_vector, v)
# Vector cannot be split to score/vector
v = ""
self.assertRaises(CVSS2RHMalformedError, CVSS2.from_rh_vector, v)
v = "5.0|AV:L|AC:H|Au:M|C:C|I:P|A:P"
self.assertRaises(CVSS2RHMalformedError, CVSS2.from_rh_vector, v)
# Score is not float
v = "ABC/AV:L/AC:H/Au:M/C:C/I:P/A:P"
self.assertRaises(CVSS2RHMalformedError, CVSS2.from_rh_vector, v)
def test_temporal_vector(self):
"""
Test for retrieving only the Temporal CVSS Vector.
"""
v = "AV:A/AC:H/Au:S/C:C/I:C/A:P/E:U/RL:U/RC:UR/CDP:ND/TD:ND/CR:L/IR:M/AR:ND"
self.assertEqual(
"E:U/RL:U/RC:UR",
CVSS2(v).temporal_vector(),
)
v = "AV:A/AC:H/Au:S/C:C/I:C/A:P/CDP:ND/TD:ND/CR:L/IR:M/AR:ND"
self.assertEqual(
"E:ND/RL:ND/RC:ND",
CVSS2(v).temporal_vector(),
)
v = "AV:A/AC:H/Au:S/C:C/I:C/A:P/RL:U/RC:UR/CDP:ND/TD:ND/CR:L/IR:M/AR:ND"
self.assertEqual(
"E:ND/RL:U/RC:UR",
CVSS2(v).temporal_vector(),
)
v = "AV:A/AC:H/Au:S/C:C/I:C/A:P/E:U/RC:UR/CDP:ND/TD:ND/CR:L/IR:M/AR:ND"
self.assertEqual(
"E:U/RL:ND/RC:UR",
CVSS2(v).temporal_vector(),
)
v = "AV:A/AC:H/Au:S/C:C/I:C/A:P/E:U/RL:U/CDP:ND/TD:ND/CR:L/IR:M/AR:ND"
self.assertEqual(
"E:U/RL:U/RC:ND",
CVSS2(v).temporal_vector(),
)
def test_environmental_vector(self):
"""
Test for retrieving only the Environmental CVSS Vector.
"""
v = "AV:A/AC:H/Au:S/C:C/I:C/A:P/E:U/RL:U/CDP:N/TD:N/CR:L/IR:M/AR:L"
self.assertEqual(
"CDP:N/TD:N/CR:L/IR:M/AR:L",
CVSS2(v).environmental_vector(),
)
v = "AV:A/AC:H/Au:S/C:C/I:C/A:P/E:U/RL:U"
self.assertEqual(
"CDP:ND/TD:ND/CR:ND/IR:ND/AR:ND",
CVSS2(v).environmental_vector(),
)
v = "AV:A/AC:H/Au:S/C:C/I:C/A:P/E:U/RL:U/TD:N/CR:L/IR:M/AR:L"
self.assertEqual(
"CDP:ND/TD:N/CR:L/IR:M/AR:L",
CVSS2(v).environmental_vector(),
)
def test_parse_from_text_cvss2(self):
"""
Tests for parsing CVSS from text.
"""
i = "AV:N/AC:L/Au:N/C:C/I:C/A:C"
e = [CVSS2(i)]
self.assertEqual(parser.parse_cvss_from_text(i), e)
i = "AV:L/AC:L/Au:S/C:P/I:P/A:P/E:U/RC:C/CDP:LM/TD:L/IR:H/AR:M"
e = [CVSS2(i)]
self.assertEqual(parser.parse_cvss_from_text(i), e)
i = "AV:L/AC:M/Au:S/C:N/I:P/A:C/E:U/RL:OF/RC:UR/CDP:N/TD:L/CR:H/IR:H/AR:H"
e = [CVSS2(i)]
self.assertEqual(parser.parse_cvss_from_text(i), e)
# Bad value
i = "AV:N/AC:L/Au:N/C:C/I:C/A:X"
e = []
self.assertEqual(parser.parse_cvss_from_text(i), e)
# Truncated vector
i = "AV:N/AC:"
e = []
self.assertEqual(parser.parse_cvss_from_text(i), e)
i = ""
e = []
self.assertEqual(parser.parse_cvss_from_text(i), e)
# Correct parsing
v = "AV:N/AC:L/Au:N/C:C/I:C/A:C"
i = "xxx " + v
e = [CVSS2(v)]
self.assertEqual(parser.parse_cvss_from_text(i), e)
v = "AV:N/AC:L/Au:N/C:C/I:C/A:C"
i = v + " xxx"
e = [CVSS2(v)]
self.assertEqual(parser.parse_cvss_from_text(i), e)
# End of sentence
v = "AV:N/AC:L/Au:N/C:C/I:C/A:C"
i = v + "."
e = [CVSS2(v)]
self.assertEqual(parser.parse_cvss_from_text(i), e)
# Missing space after dot before vector
v = "AV:N/AC:L/Au:N/C:C/I:C/A:C"
i = "xxx." + v
e = [CVSS2(v)]
self.assertEqual(parser.parse_cvss_from_text(i), e)
# Missing space after dot after vector
v = "AV:N/AC:L/Au:N/C:C/I:C/A:C"
i = v + ".xxx"
e = [CVSS2(v)]
self.assertEqual(parser.parse_cvss_from_text(i), e)
def test_parse_from_text_multiple_vectors_same_cvss(self):
v = "AV:N/AC:L/Au:N/C:C/I:C/A:C"
e = [CVSS2(v)]
i = "Title: {0}\nThis is an overview of {0} problem.\nLinks: {0}".format(v)
self.assertEqual(parser.parse_cvss_from_text(i), e)
def test_json_ordering(self):
with open(path.join(WD, "vectors_random2")) as f:
for line in f:
vector, _ = line.split(" - ")
cvss = CVSS2(vector).as_json(sort=True)
old_key = ""
for key in cvss:
if key < old_key:
self.fail(
"dict ordering was not preserved: key {} less than previous key {} "
"for CVSS object {}".format(key, old_key, cvss)
)
old_key = key
def test_json_schema_repr(self):
try:
import jsonschema
except ImportError:
return
with open(path.join(WD, "schemas/cvss-v2.0.json")) as schema_file:
schema = json.load(schema_file)
vectors = []
with open(path.join(WD, "vectors_random2")) as f:
for line in f:
vectors.append(line.split(" - ")[0])
# Pick 500 random vectors; verifying all 100k is very slow.
for vector in random.sample(vectors, k=500):
cvss = CVSS2(vector)
try:
jsonschema.validate(instance=cvss.as_json(), schema=schema)
except jsonschema.exceptions.ValidationError:
self.fail("jsonschema validation failed on vector: {}".format(vector))
def test_json_schema_minimal_base_only(self):
v = "AV:L/AC:H/Au:N/C:N/I:N/A:C"
json_data = CVSS2(v).as_json(minimal=True)
# Selectively test some values
self.assertIn("accessVector", json_data)
self.assertNotIn("exploitability", json_data)
self.assertNotIn("confidentialityRequirement", json_data)
def test_json_data_schema_minimal_temporal_only(self):
v = "AV:L/AC:H/Au:N/C:N/I:N/A:C/E:H/RL:U/RC:C"
json_data = CVSS2(v).as_json(minimal=True)
# Selectively test some values
self.assertIn("accessVector", json_data)
self.assertIn("exploitability", json_data)
self.assertIn("reportConfidence", json_data)
self.assertNotIn("availabilityRequirement", json_data)
def test_json_data_schema_minimal_environmental_only(self):
v = "AV:L/AC:H/Au:N/C:N/I:N/A:C/E:H/RL:U/RC:C/CDP:LM/TD:M/CR:H/IR:M/AR:L"
json_data = CVSS2(v).as_json(minimal=True)
# Selectively test some values
self.assertIn("accessVector", json_data)
self.assertNotIn("exploitCodeMaturity", json_data)
self.assertIn("confidentialityRequirement", json_data)
if __name__ == "__main__":
unittest.main()
|
