In Wireshark 2.6.0 to 2.6.5 and 2.4.0 to 2.4.11, the ISAKMP dissector could crash. This was addressed in epan/dissectors/packet-isakmp.c by properly handling the case of a missing decryption data block. References: https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=15374 https://www.wireshark.org/security/wnpa-sec-2019-04.html Upstream Patch: https://code.wireshark.org/review/gitweb?p=wireshark.git;a=commit;h=b5b02f2a9b8772d8814096f86c60a32889d61f2c
Created wireshark tracking bugs for this issue: Affects: fedora-all [bug 1667593]
Function dissect_transform() in packet-isakmp.c has a NULL pointer dereference flaw. The `decr` parameter may be NULL, but it is dereferenced without any check, thus leading to a crash.