CVE-2022-37966 python:tests/krb5: ignore empty supplementalCredentials attributes

BUG: https://bugzilla.samba.org/show_bug.cgi?id=15237

Signed-off-by: Stefan Metzmacher <metze@samba.org>
Reviewed-by: Joseph Sutton <josephsutton@catalyst.net.nz>
Reviewed-by: Andrew Bartlett <abartlet@samba.org>
(cherry picked from commit f434a30ee7c40aac4a223fcabac9ddd160a155a5)

diff --git a/python/samba/tests/krb5/kdc_base_test.py b/python/samba/tests/krb5/kdc_base_test.py
index 68862aefc3abfab732de54638d88812b4db1a82b..28cde91feca14f95ff5ec867b99a143dcefe7b74 100644 (file)
--- a/python/samba/tests/krb5/kdc_base_test.py
+++ b/python/samba/tests/krb5/kdc_base_test.py
@@ -564,6 +564,8 @@ class KDCBaseTest(RawKerberosTest):
         for attr in attributes:
             if attr.attid == drsuapi.DRSUAPI_ATTID_supplementalCredentials:
                 net_ctx.replicate_decrypt(bind, attr, rid)
+                if attr.value_ctr.num_values == 0:
+                    continue
                 attr_val = attr.value_ctr.values[0].blob
 
                 spl = ndr_unpack(drsblobs.supplementalCredentialsBlob,