In Wireshark 2.4.0, the Modbus dissector could crash with a NULL pointer dereference. This was addressed in epan/dissectors/packet-mbtcp.c by adding length validation.
A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Wireshark | Wireshark | 2.4.0 (including) | 2.4.0 (including) |
| Wireshark | Ubuntu | artful | * |
| Wireshark | Ubuntu | bionic | * |
| Wireshark | Ubuntu | trusty | * |
| Wireshark | Ubuntu | xenial | * |
| Wireshark | Ubuntu | zesty | * |