https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=3313
Summary: BACnet MS/TP checksums
Product: Wireshark
Version: SVN
Platform: PC
URL: http://kargs.net/captures/cimetrics_mstp.pcap
OS/Version: All
Status: NEW
Severity: Normal
Priority: Low
Component: Wireshark
AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
ReportedBy: steve@xxxxxxxxx
Steve Karg <steve@xxxxxxxxx> changed:
What |Removed |Added
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Attachment #2826| |review_for_checkin?
Flag| |
Created an attachment (id=2826)
--> (https://bugs.wireshark.org/bugzilla/attachment.cgi?id=2826)
packet-mstp.c.patch
Build Information:
wireshark 1.1.3 (SVN Rev 27642)
Copyright 1998-2009 Gerald Combs <gerald@xxxxxxxxxxxxx> and contributors.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
Compiled with GTK+ 2.12.9, with GLib 2.16.6, with libpcap 0.9.8, with libz
1.2.3.3, without POSIX capabilities, without libpcre, without SMI, without
c-ares, without ADNS, without Lua, with GnuTLS 2.0.4, with Gcrypt 1.2.4, with
MIT Kerberos, without GeoIP, without PortAudio, without AirPcap.
NOTE: this build doesn't support the "matches" operator for Wireshark filter
syntax.
Running on Linux 2.6.24-23-generic, with libpcap version 0.9.8, GnuTLS 2.0.4,
Gcrypt 1.2.4.
Built using gcc 4.2.4 (Ubuntu 4.2.4-1ubuntu3).
--
When I enabled the checksum validate in packet-mstp.c, a capture locks up
Wireshark when the length is greater than 255. Corrected the size of the
for-loop counter declaration, and added expert info and a checksum_bad flag.
Added the MS/TP checksum bad setting to Checksum color filter. Fuzz tested with
BACnet MS/TP captures.
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