Wireshark-bugs: [Wireshark-bugs] [Bug 10526] New: A packet with IGMP version 1 is recognized as
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Sat, 04 Oct 2014 13:31:37 +0000
Bug ID 10526
Summary A packet with IGMP version 1 is recognized as IGMP version 3
Product Wireshark
Version 1.6.6
Hardware x86-64
OS Windows 7
Status UNCONFIRMED
Severity Normal
Priority Low
Component Dissection engine (libwireshark)
Assignee bugzilla-admin@wireshark.org
Reporter boaz.brickner@gmail.com 

Created attachment 13121 [details]
A sample that shows how Wireshark recognizes IGMP query version 3 even though
the IGMP part contains exactly 8 bytes

Build Information:
Version 1.6.6 (SVNRev 41803 from /trunk-1.6)

Copyright 1998-2012 Gerald Combs <gerald@wireshark.org> 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 (64-bit) with GTK+ 2.22.1, with GLib 2.26.1, with WinPcap (version
unknown), with libz 1.2.5, without POSIX capabilities, without libpcre, without
SMI, with c-ares 1.7.1, with Lua 5.1, without Python, with GnuTLS 2.12.18, with
Gcrypt 1.4.6, without Kerberos, with GeoIP, with PortAudio V19-devel (built Mar
27 2012), with AirPcap.

Running on 64-bit Windows 7 Service Pack 1, build 7601, with WinPcap version
4.1.2 (packet.dll version 4.1.0.2001), based on libpcap version 1.0 branch
1_0_rel0b (20091008), GnuTLS 2.12.18, Gcrypt 1.4.6, without AirPcap.

Built using Microsoft Visual C++ 9.0 build 21022

Wireshark is Open Source Software released under the GNU General Public
License.

Check the man page and http://www.wireshark.org for more information.
--
Discovered when developing Pcap.Net (http://pcapdot.net).

IGMP version 1 is 8 bytes long.
IGMP query version 3 is at least 12 bytes long.

The attached pcap file contains a packet with IGMP packet.
The IGMP packet is recognized by Wireshark 1.6.6 as IGMP query version 3 even
though the IGMP part contains exactly 8 bytes.

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