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.
Weakness
The product dereferences a pointer that it expects to be valid but is NULL.
Affected Software
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Wireshark | Wireshark | 2.4.0 (including) | 2.4.0 (including) |
| Wireshark | Ubuntu | artful | * |
| Wireshark | Ubuntu | bionic | * |
| Wireshark | Ubuntu | esm-apps/bionic | * |
| Wireshark | Ubuntu | esm-apps/xenial | * |
| Wireshark | Ubuntu | esm-infra-legacy/trusty | * |
| Wireshark | Ubuntu | trusty | * |
| Wireshark | Ubuntu | trusty/esm | * |
| Wireshark | Ubuntu | xenial | * |
| Wireshark | Ubuntu | zesty | * |
Potential Mitigations
References
- http://www.securityfocus.com/bid/100545
- http://www.securitytracker.com/id/1039254
- https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=13925
- https://code.wireshark.org/review/gitweb?p=wireshark.git%3Ba=commit%3Bh=b87ffbd12bddf64582c0a6e082b462744474de94
- https://www.wireshark.org/security/wnpa-sec-2017-40.html
- http://www.securityfocus.com/bid/100545
- http://www.securitytracker.com/id/1039254
- https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=13925
- https://code.wireshark.org/review/gitweb?p=wireshark.git%3Ba=commit%3Bh=b87ffbd12bddf64582c0a6e082b462744474de94
- https://www.wireshark.org/security/wnpa-sec-2017-40.html