Wireshark-bugs: [Wireshark-bugs] [Bug 3974] New: wrong decoding of gtp.target identification
Date: Wed, 2 Sep 2009 06:01:02 -0700 (PDT)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=3974

           Summary: wrong decoding of gtp.target identification
           Product: Wireshark
           Version: 1.2.1
          Platform: x86
        OS/Version: Windows XP
            Status: NEW
          Severity: Major
          Priority: Low
         Component: Wireshark
        AssignedTo: [email protected]
        ReportedBy: [email protected]


Build Information:
Version 1.2.1 (SVN Rev 29141)

Copyright 1998-2009 Gerald Combs <[email protected]> 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+ 2.16.2, with GLib 2.20.3, with WinPcap (version unknown),
with libz 1.2.3, without POSIX capabilities, with libpcre 7.0, with SMI 0.4.8,
with c-ares 1.6.0, with Lua 5.1, with GnuTLS 2.8.1, with Gcrypt 1.4.4, with MIT
Kerberos, with GeoIP, with PortAudio V19-devel (built Jul 19 2009), with
AirPcap.

Running on Windows XP Service Pack 2, build 2600, with WinPcap version 4.0
(packet.dll version 4.0.0.755), based on libpcap version 0.9.5, GnuTLS 2.8.1,
Gcrypt 1.4.4, 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.
--
GTP protocol: Target Identification shall be coded as TLV IE where value is
coded as TargetRNC-ID part of TargetID according 3GPP 25.413 and not as
TargetID => it is not a choice.

TargetID ::= CHOICE {
        targetRNC-ID                    TargetRNC-ID,
        cGI                             CGI,
        ...
}

such badly decoded IE is considered as Malformed packet


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