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commit 88a31ffeccce13192a474f4981b9cf6cfdfe065e
Author: Victor Stinner <vstinner@redhat.com>
Date: Wed Mar 20 17:43:20 2019 +0100
bpo-35746: Fix segfault in ssl's cert parser (GH-11569)
Fix a NULL pointer deref in ssl module. The cert parser did not handle CRL
distribution points with empty DP or URI correctly. A malicious or buggy
certificate can result into segfault.
Signed-off-by: Christian Heimes <christian@python.org>
https://bugs.python.org/issue35746
(cherry picked from commit a37f52436f9aa4b9292878b72f3ff1480e2606c3)
Co-authored-by: Christian Heimes <christian@python.org>
diff --git a/Lib/test/talos-2019-0758.pem b/Lib/test/talos-2019-0758.pem
new file mode 100644
index 0000000..13b95a7
--- /dev/null
+++ b/Lib/test/talos-2019-0758.pem
@@ -0,0 +1,22 @@
+-----BEGIN CERTIFICATE-----
+MIIDqDCCApKgAwIBAgIBAjALBgkqhkiG9w0BAQswHzELMAkGA1UEBhMCVUsxEDAO
+BgNVBAMTB2NvZHktY2EwHhcNMTgwNjE4MTgwMDU4WhcNMjgwNjE0MTgwMDU4WjA7
+MQswCQYDVQQGEwJVSzEsMCoGA1UEAxMjY29kZW5vbWljb24tdm0tMi50ZXN0Lmxh
+bC5jaXNjby5jb20wggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQC63fGB
+J80A9Av1GB0bptslKRIUtJm8EeEu34HkDWbL6AJY0P8WfDtlXjlPaLqFa6sqH6ES
+V48prSm1ZUbDSVL8R6BYVYpOlK8/48xk4pGTgRzv69gf5SGtQLwHy8UPBKgjSZoD
+5a5k5wJXGswhKFFNqyyxqCvWmMnJWxXTt2XDCiWc4g4YAWi4O4+6SeeHVAV9rV7C
+1wxqjzKovVe2uZOHjKEzJbbIU6JBPb6TRfMdRdYOw98n1VXDcKVgdX2DuuqjCzHP
+WhU4Tw050M9NaK3eXp4Mh69VuiKoBGOLSOcS8reqHIU46Reg0hqeL8LIL6OhFHIF
+j7HR6V1X6F+BfRS/AgMBAAGjgdYwgdMwCQYDVR0TBAIwADAdBgNVHQ4EFgQUOktp
+HQjxDXXUg8prleY9jeLKeQ4wTwYDVR0jBEgwRoAUx6zgPygZ0ZErF9sPC4+5e2Io
+UU+hI6QhMB8xCzAJBgNVBAYTAlVLMRAwDgYDVQQDEwdjb2R5LWNhggkA1QEAuwb7
+2s0wCQYDVR0SBAIwADAuBgNVHREEJzAlgiNjb2Rlbm9taWNvbi12bS0yLnRlc3Qu
+bGFsLmNpc2NvLmNvbTAOBgNVHQ8BAf8EBAMCBaAwCwYDVR0fBAQwAjAAMAsGCSqG
+SIb3DQEBCwOCAQEAvqantx2yBlM11RoFiCfi+AfSblXPdrIrHvccepV4pYc/yO6p
+t1f2dxHQb8rWH3i6cWag/EgIZx+HJQvo0rgPY1BFJsX1WnYf1/znZpkUBGbVmlJr
+t/dW1gSkNS6sPsM0Q+7HPgEv8CPDNK5eo7vU2seE0iWOkxSyVUuiCEY9ZVGaLVit
+p0C78nZ35Pdv4I+1cosmHl28+es1WI22rrnmdBpH8J1eY6WvUw2xuZHLeNVN0TzV
+Q3qq53AaCWuLOD1AjESWuUCxMZTK9DPS4JKXTK8RLyDeqOvJGjsSWp3kL0y3GaQ+
+10T1rfkKJub2+m9A9duin1fn6tHc2wSvB7m3DA==
+-----END CERTIFICATE-----
diff --git a/Lib/test/test_ssl.py b/Lib/test/test_ssl.py
index f7a6746..31af578 100644
--- a/Lib/test/test_ssl.py
+++ b/Lib/test/test_ssl.py
@@ -68,6 +68,7 @@ WRONGCERT = data_file("XXXnonexisting.pem")
BADKEY = data_file("badkey.pem")
NOKIACERT = data_file("nokia.pem")
NULLBYTECERT = data_file("nullbytecert.pem")
+TALOS_INVALID_CRLDP = data_file("talos-2019-0758.pem")
DHFILE = data_file("dh1024.pem")
BYTES_DHFILE = DHFILE.encode(sys.getfilesystemencoding())
@@ -238,6 +239,27 @@ class BasicSocketTests(unittest.TestCase):
('IP Address', '2001:DB8:0:0:0:0:0:1\n'))
)
+ def test_parse_cert_CVE_2019_5010(self):
+ p = ssl._ssl._test_decode_cert(TALOS_INVALID_CRLDP)
+ if support.verbose:
+ sys.stdout.write("\n" + pprint.pformat(p) + "\n")
+ self.assertEqual(
+ p,
+ {
+ 'issuer': (
+ (('countryName', 'UK'),), (('commonName', 'cody-ca'),)),
+ 'notAfter': 'Jun 14 18:00:58 2028 GMT',
+ 'notBefore': 'Jun 18 18:00:58 2018 GMT',
+ 'serialNumber': '02',
+ 'subject': ((('countryName', 'UK'),),
+ (('commonName',
+ 'codenomicon-vm-2.test.lal.cisco.com'),)),
+ 'subjectAltName': (
+ ('DNS', 'codenomicon-vm-2.test.lal.cisco.com'),),
+ 'version': 3
+ }
+ )
+
def test_parse_all_sans(self):
p = ssl._ssl._test_decode_cert(ALLSANFILE)
self.assertEqual(p['subjectAltName'],
diff --git a/Modules/_ssl.c b/Modules/_ssl.c
index 6220bea..baea6e1 100644
--- a/Modules/_ssl.c
+++ b/Modules/_ssl.c
@@ -1103,6 +1103,10 @@ _get_crl_dp(X509 *certificate) {
STACK_OF(GENERAL_NAME) *gns;
dp = sk_DIST_POINT_value(dps, i);
+ if (dp->distpoint == NULL) {
+ /* Ignore empty DP value, CVE-2019-5010 */
+ continue;
+ }
gns = dp->distpoint->name.fullname;
for (j=0; j < sk_GENERAL_NAME_num(gns); j++) {