Wireshark · Wireshark-bugs: [Wireshark-bugs] [Bug 4526] New: GSM MAP problem - IMSI in MO-ForwardSM not decoded

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https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=4526

           Summary: GSM MAP problem - IMSI in MO-ForwardSM not decoded
           Product: Wireshark
           Version: 1.2.6
          Platform: x86-64
        OS/Version: Windows XP
            Status: NEW
          Severity: Minor
          Priority: Low
         Component: Wireshark
        AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
        ReportedBy: tomas.zemek@xxxxxxxxx


Created an attachment (id=4317)
 --> (https://bugs.wireshark.org/bugzilla/attachment.cgi?id=4317)
Packet bytes

Build Information:
Version 1.2.6 (SVN Rev 31702)

Copyright 1998-2010 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+ 2.18.5, with GLib 2.22.3, with WinPcap (version unknown),
with libz 1.2.3, without POSIX capabilities, without libpcre, with SMI 0.4.8,
with c-ares 1.7.0, with Lua 5.1, with GnuTLS 2.8.5, with Gcrypt 1.4.5, with MIT
Kerberos, with GeoIP, with PortAudio V19-devel (built Jan 27 2010), with
AirPcap.

Running on Windows XP Service Pack 3, build 2600, with WinPcap version 4.1.1
(packet.dll version 4.1.0.1753), based on libpcap version 1.0 branch 1_0_rel0b
(20091008), GnuTLS 2.8.5, Gcrypt 1.4.5, without AirPcap.

Built using Microsoft Visual C++ 9.0 build 30729

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

Check the man page and http://www.wireshark.org for more information.
--
Having GSM MAP version 3, performing MO-ForwardSM with TCAP segmentation
(invoke carried in TC-Continue).
IMSI is included, visible in the packet bytes, but the Wireshark decoder
doesn't recognize it at GSM MAP layer and prints out:

BER Error: This field lies beyond the end of known sequence definition
[Expert Info (Warn/Malformed): BER Error: Unknown field in sequence]

If TCAP segmentation is not involved, then this issue doesn't occur.

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