Issue #18709: Fix CVE-2013-4238. The SSL module now handles NULL bytes
inside subjectAltName correctly. Formerly the module has used OpenSSL's GENERAL_NAME_print() function to get the string represention of ASN.1 strings for rfc822Name (email), dNSName (DNS) and uniformResourceIdentifier (URI).
This commit is contained in:
Christian Heimes
commit
e06d47c70c
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@ -0,0 +1,90 @@
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Certificate:
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Data:
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Version: 3 (0x2)
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Serial Number: 0 (0x0)
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Signature Algorithm: sha1WithRSAEncryption
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Issuer: C=US, ST=Oregon, L=Beaverton, O=Python Software Foundation, OU=Python Core Development, CN=null.python.org\x00example.org/emailAddress=python-dev@python.org
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Validity
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Not Before: Aug 7 13:11:52 2013 GMT
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Not After : Aug 7 13:12:52 2013 GMT
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Subject: C=US, ST=Oregon, L=Beaverton, O=Python Software Foundation, OU=Python Core Development, CN=null.python.org\x00example.org/emailAddress=python-dev@python.org
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Subject Public Key Info:
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Public Key Algorithm: rsaEncryption
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Public-Key: (2048 bit)
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Modulus:
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00:b5:ea:ed:c9:fb:46:7d:6f:3b:76:80:dd:3a:f3:
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03:94:0b:a7:a6:db:ec:1d:df:ff:23:74:08:9d:97:
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16:3f:a3:a4:7b:3e:1b:0e:96:59:25:03:a7:26:e2:
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88:a9:cf:79:cd:f7:04:56:b0:ab:79:32:6e:59:c1:
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32:30:54:eb:58:a8:cb:91:f0:42:a5:64:27:cb:d4:
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56:31:88:52:ad:cf:bd:7f:f0:06:64:1f:cc:27:b8:
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a3:8b:8c:f3:d8:29:1f:25:0b:f5:46:06:1b:ca:02:
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45:ad:7b:76:0a:9c:bf:bb:b9:ae:0d:16:ab:60:75:
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ae:06:3e:9c:7c:31:dc:92:2f:29:1a:e0:4b:0c:91:
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90:6c:e9:37:c5:90:d7:2a:d7:97:15:a3:80:8f:5d:
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7b:49:8f:54:30:d4:97:2c:1c:5b:37:b5:ab:69:30:
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68:43:d3:33:78:4b:02:60:f5:3c:44:80:a1:8f:e7:
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f0:0f:d1:5e:87:9e:46:cf:62:fc:f9:bf:0c:65:12:
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f1:93:c8:35:79:3f:c8:ec:ec:47:f5:ef:be:44:d5:
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ae:82:1e:2d:9a:9f:98:5a:67:65:e1:74:70:7c:cb:
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d3:c2:ce:0e:45:49:27:dc:e3:2d:d4:fb:48:0e:2f:
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9e:77:b8:14:46:c0:c4:36:ca:02:ae:6a:91:8c:da:
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2f:85
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Exponent: 65537 (0x10001)
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X509v3 extensions:
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X509v3 Basic Constraints: critical
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CA:FALSE
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X509v3 Subject Key Identifier:
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88:5A:55:C0:52:FF:61:CD:52:A3:35:0F:EA:5A:9C:24:38:22:F7:5C
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X509v3 Key Usage:
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Digital Signature, Non Repudiation, Key Encipherment
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X509v3 Subject Alternative Name:
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*************************************************************
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WARNING: The values for DNS, email and URI are WRONG. OpenSSL
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doesn't print the text after a NULL byte.
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*************************************************************
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DNS:altnull.python.org, email:null@python.org, URI:http://null.python.org, IP Address:192.0.2.1, IP Address:2001:DB8:0:0:0:0:0:1
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Signature Algorithm: sha1WithRSAEncryption
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ac:4f:45:ef:7d:49:a8:21:70:8e:88:59:3e:d4:36:42:70:f5:
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a3:bd:8b:d7:a8:d0:58:f6:31:4a:b1:a4:a6:dd:6f:d9:e8:44:
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3c:b6:0a:71:d6:7f:b1:08:61:9d:60:ce:75:cf:77:0c:d2:37:
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86:02:8d:5e:5d:f9:0f:71:b4:16:a8:c1:3d:23:1c:f1:11:b3:
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56:6e:ca:d0:8d:34:94:e6:87:2a:99:f2:ae:ae:cc:c2:e8:86:
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de:08:a8:7f:c5:05:fa:6f:81:a7:82:e6:d0:53:9d:34:f4:ac:
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3e:40:fe:89:57:7a:29:a4:91:7e:0b:c6:51:31:e5:10:2f:a4:
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60:76:cd:95:51:1a:be:8b:a1:b0:fd:ad:52:bd:d7:1b:87:60:
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d2:31:c7:17:c4:18:4f:2d:08:25:a3:a7:4f:b7:92:ca:e2:f5:
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25:f1:54:75:81:9d:b3:3d:61:a2:f7:da:ed:e1:c6:6f:2c:60:
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1f:d8:6f:c5:92:05:ab:c9:09:62:49:a9:14:ad:55:11:cc:d6:
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4a:19:94:99:97:37:1d:81:5f:8b:cf:a3:a8:96:44:51:08:3d:
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0b:05:65:12:eb:b6:70:80:88:48:72:4f:c6:c2:da:cf:cd:8e:
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5b:ba:97:2f:60:b4:96:56:49:5e:3a:43:76:63:04:be:2a:f6:
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c1:ca:a9:94
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-----BEGIN CERTIFICATE-----
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MIIE2DCCA8CgAwIBAgIBADANBgkqhkiG9w0BAQUFADCBxTELMAkGA1UEBhMCVVMx
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DzANBgNVBAgMBk9yZWdvbjESMBAGA1UEBwwJQmVhdmVydG9uMSMwIQYDVQQKDBpQ
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eXRob24gU29mdHdhcmUgRm91bmRhdGlvbjEgMB4GA1UECwwXUHl0aG9uIENvcmUg
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RGV2ZWxvcG1lbnQxJDAiBgNVBAMMG251bGwucHl0aG9uLm9yZwBleGFtcGxlLm9y
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ZzEkMCIGCSqGSIb3DQEJARYVcHl0aG9uLWRldkBweXRob24ub3JnMB4XDTEzMDgw
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NzEzMTE1MloXDTEzMDgwNzEzMTI1MlowgcUxCzAJBgNVBAYTAlVTMQ8wDQYDVQQI
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DAZPcmVnb24xEjAQBgNVBAcMCUJlYXZlcnRvbjEjMCEGA1UECgwaUHl0aG9uIFNv
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ZnR3YXJlIEZvdW5kYXRpb24xIDAeBgNVBAsMF1B5dGhvbiBDb3JlIERldmVsb3Bt
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ZW50MSQwIgYDVQQDDBtudWxsLnB5dGhvbi5vcmcAZXhhbXBsZS5vcmcxJDAiBgkq
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hkiG9w0BCQEWFXB5dGhvbi1kZXZAcHl0aG9uLm9yZzCCASIwDQYJKoZIhvcNAQEB
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BQADggEPADCCAQoCggEBALXq7cn7Rn1vO3aA3TrzA5QLp6bb7B3f/yN0CJ2XFj+j
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pHs+Gw6WWSUDpybiiKnPec33BFawq3kyblnBMjBU61ioy5HwQqVkJ8vUVjGIUq3P
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vX/wBmQfzCe4o4uM89gpHyUL9UYGG8oCRa17dgqcv7u5rg0Wq2B1rgY+nHwx3JIv
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KRrgSwyRkGzpN8WQ1yrXlxWjgI9de0mPVDDUlywcWze1q2kwaEPTM3hLAmD1PESA
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oY/n8A/RXoeeRs9i/Pm/DGUS8ZPINXk/yOzsR/XvvkTVroIeLZqfmFpnZeF0cHzL
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08LODkVJJ9zjLdT7SA4vnne4FEbAxDbKAq5qkYzaL4UCAwEAAaOB0DCBzTAMBgNV
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HRMBAf8EAjAAMB0GA1UdDgQWBBSIWlXAUv9hzVKjNQ/qWpwkOCL3XDALBgNVHQ8E
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BAMCBeAwgZAGA1UdEQSBiDCBhYIeYWx0bnVsbC5weXRob24ub3JnAGV4YW1wbGUu
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Y29tgSBudWxsQHB5dGhvbi5vcmcAdXNlckBleGFtcGxlLm9yZ4YpaHR0cDovL251
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bGwucHl0aG9uLm9yZwBodHRwOi8vZXhhbXBsZS5vcmeHBMAAAgGHECABDbgAAAAA
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AAAAAAAAAAEwDQYJKoZIhvcNAQEFBQADggEBAKxPRe99SaghcI6IWT7UNkJw9aO9
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i9eo0Fj2MUqxpKbdb9noRDy2CnHWf7EIYZ1gznXPdwzSN4YCjV5d+Q9xtBaowT0j
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HPERs1ZuytCNNJTmhyqZ8q6uzMLoht4IqH/FBfpvgaeC5tBTnTT0rD5A/olXeimk
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kX4LxlEx5RAvpGB2zZVRGr6LobD9rVK91xuHYNIxxxfEGE8tCCWjp0+3ksri9SXx
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VHWBnbM9YaL32u3hxm8sYB/Yb8WSBavJCWJJqRStVRHM1koZlJmXNx2BX4vPo6iW
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RFEIPQsFZRLrtnCAiEhyT8bC2s/Njlu6ly9gtJZWSV46Q3ZjBL4q9sHKqZQ=
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-----END CERTIFICATE-----
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@ -56,6 +56,7 @@ BADCERT = data_file("badcert.pem")
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WRONGCERT = data_file("XXXnonexisting.pem")
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BADKEY = data_file("badkey.pem")
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NOKIACERT = data_file("nokia.pem")
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NULLBYTECERT = data_file("nullbytecert.pem")
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DHFILE = data_file("dh512.pem")
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BYTES_DHFILE = os.fsencode(DHFILE)
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@ -176,6 +177,27 @@ class BasicSocketTests(unittest.TestCase):
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('DNS', 'projects.forum.nokia.com'))
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)
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def test_parse_cert_CVE_2013_4238(self):
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p = ssl._ssl._test_decode_cert(NULLBYTECERT)
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if support.verbose:
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sys.stdout.write("\n" + pprint.pformat(p) + "\n")
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subject = ((('countryName', 'US'),),
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(('stateOrProvinceName', 'Oregon'),),
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(('localityName', 'Beaverton'),),
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(('organizationName', 'Python Software Foundation'),),
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(('organizationalUnitName', 'Python Core Development'),),
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(('commonName', 'null.python.org\x00example.org'),),
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(('emailAddress', 'python-dev@python.org'),))
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self.assertEqual(p['subject'], subject)
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self.assertEqual(p['issuer'], subject)
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self.assertEqual(p['subjectAltName'],
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(('DNS', 'altnull.python.org\x00example.com'),
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('email', 'null@python.org\x00user@example.org'),
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('URI', 'http://null.python.org\x00http://example.org'),
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('IP Address', '192.0.2.1'),
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('IP Address', '2001:DB8:0:0:0:0:0:1\n'))
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)
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def test_DER_to_PEM(self):
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with open(SVN_PYTHON_ORG_ROOT_CERT, 'r') as f:
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pem = f.read()
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@ -308,6 +330,13 @@ class BasicSocketTests(unittest.TestCase):
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fail(cert, 'foo.a.com')
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fail(cert, 'bar.foo.com')
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# NULL bytes are bad, CVE-2013-4073
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cert = {'subject': ((('commonName',
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'null.python.org\x00example.org'),),)}
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ok(cert, 'null.python.org\x00example.org') # or raise an error?
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fail(cert, 'example.org')
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fail(cert, 'null.python.org')
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# Slightly fake real-world example
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cert = {'notAfter': 'Jun 26 21:41:46 2011 GMT',
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'subject': ((('commonName', 'linuxfrz.org'),),),
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@ -28,6 +28,12 @@ Core and Builtins
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Library
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-------
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- Issue #18709: Fix CVE-2013-4238. The SSL module now handles NULL bytes
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inside subjectAltName correctly. Formerly the module has used OpenSSL's
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GENERAL_NAME_print() function to get the string represention of ASN.1
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strings for ``rfc822Name`` (email), ``dNSName`` (DNS) and
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``uniformResourceIdentifier`` (URI).
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- Issue #18701: Remove support of old CPython versions (<3.0) from C code.
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- Issue #18756: Improve error reporting in os.urandom() when the failure
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@ -805,12 +805,14 @@ _get_peer_alt_names (X509 *certificate) {
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ext->value->length));
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for(j = 0; j < sk_GENERAL_NAME_num(names); j++) {
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/* get a rendering of each name in the set of names */
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int gntype;
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ASN1_STRING *as = NULL;
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name = sk_GENERAL_NAME_value(names, j);
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if (name->type == GEN_DIRNAME) {
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gntype = name-> type;
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switch (gntype) {
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case GEN_DIRNAME:
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/* we special-case DirName as a tuple of
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tuples of attributes */
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@ -832,11 +834,62 @@ _get_peer_alt_names (X509 *certificate) {
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goto fail;
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}
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PyTuple_SET_ITEM(t, 1, v);
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break;
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} else {
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case GEN_EMAIL:
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case GEN_DNS:
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case GEN_URI:
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/* GENERAL_NAME_print() doesn't handle NULL bytes in ASN1_string
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correctly, CVE-2013-4238 */
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t = PyTuple_New(2);
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if (t == NULL)
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goto fail;
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switch (gntype) {
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case GEN_EMAIL:
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v = PyUnicode_FromString("email");
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as = name->d.rfc822Name;
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break;
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case GEN_DNS:
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v = PyUnicode_FromString("DNS");
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as = name->d.dNSName;
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break;
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case GEN_URI:
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v = PyUnicode_FromString("URI");
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as = name->d.uniformResourceIdentifier;
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break;
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}
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if (v == NULL) {
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Py_DECREF(t);
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goto fail;
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}
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PyTuple_SET_ITEM(t, 0, v);
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v = PyUnicode_FromStringAndSize((char *)ASN1_STRING_data(as),
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ASN1_STRING_length(as));
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if (v == NULL) {
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Py_DECREF(t);
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goto fail;
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}
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PyTuple_SET_ITEM(t, 1, v);
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break;
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default:
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/* for everything else, we use the OpenSSL print form */
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switch (gntype) {
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/* check for new general name type */
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case GEN_OTHERNAME:
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case GEN_X400:
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case GEN_EDIPARTY:
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case GEN_IPADD:
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case GEN_RID:
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break;
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default:
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if (PyErr_WarnFormat(PyExc_RuntimeWarning, 1,
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"Unknown general name type %d",
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gntype) == -1) {
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goto fail;
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}
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break;
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}
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(void) BIO_reset(biobuf);
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GENERAL_NAME_print(biobuf, name);
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len = BIO_gets(biobuf, buf, sizeof(buf)-1);
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@ -863,6 +916,7 @@ _get_peer_alt_names (X509 *certificate) {
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goto fail;
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}
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PyTuple_SET_ITEM(t, 1, v);
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break;
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}
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/* and add that rendering to the list */
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