Wireshark-bugs: [Wireshark-bugs] [Bug 7691] New: [ieee802.11] TKIP dissection
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Tue, 4 Sep 2012 04:51:24 -0700 (PDT)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=7691

           Summary: [ieee802.11] TKIP dissection
           Product: Wireshark
           Version: 1.6.2
          Platform: x86
        OS/Version: Ubuntu
            Status: NEW
          Severity: Normal
          Priority: Low
         Component: Wireshark
        AssignedTo: bugzilla-admin@xxxxxxxxxxxxx
        ReportedBy: masashi.honma@xxxxxxxxx


Build Information:
wireshark 1.6.2

Copyright 1998-2011 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 (32-bit) with GTK+ 2.24.6, with GLib 2.29.92, with libpcap 1.1.1, with
libz 1.2.3.4, with POSIX capabilities (Linux), without libpcre, with SMI 0.4.8,
with c-ares 1.7.4, with Lua 5.1, without Python, with GnuTLS 2.10.5, with
Gcrypt
1.5.0, with MIT Kerberos, with GeoIP, with PortAudio V19-devel (built Jul 27
2011 11:30:44), without AirPcap.

Running on Linux 3.0.0-24-generic, with libpcap version 1.1.1, with libz
1.2.3.4, GnuTLS 2.10.5, Gcrypt 1.5.0.

Built using gcc 4.6.1.

--
In [1] "11.4.2.2 TKIP MPDU formats", we could see below sentence.
"WEPSeed[1] is not used to construct the TSC, but is set to (TSC1 | 0x20) &
0x7f."

But the IS_TKIP macro only checks (WEPSeed[1] & 0x20).
So sometimes IS_TKIP macro mis-dissects a CCMP frame as a TKIP frame.

This patch changes IS_TKIP macro to do more better check.

[1] IEEE Std 802.11.-2012

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