Wireshark-bugs: [Wireshark-bugs] [Bug 6471] New: wireshark unable to
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Wed, 19 Oct 2011 15:21:36 -0700 (PDT)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=6471

           Summary: wireshark unable to
           Product: Wireshark
           Version: 1.4.6
          Platform: Other
        OS/Version: All
            Status: NEW
          Severity: Major
          Priority: Low
         Component: Wireshark
        AssignedTo: bugzilla-admin@xxxxxxxxxxxxx
        ReportedBy: paitken@xxxxxxxxx


Created an attachment (id=7267)
 --> (https://bugs.wireshark.org/bugzilla/attachment.cgi?id=7267)
netflow options data with 16-byte system ID as scope

Build Information:
wireshark 1.4.6

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+ 2.24.4, with GLib 2.28.6, 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 1.7.3, with Lua 5.1, without Python, with GnuTLS 2.8.6, with Gcrypt
1.4.6, with MIT Kerberos, with GeoIP, with PortAudio V19-devel (built Mar 18
2011 15:44:36), without AirPcap.

Running on Linux 2.6.38-12-generic, with libpcap version 1.1.1, with libz
1.2.3.4, GnuTLS 2.8.6, Gcrypt 1.4.6.

Built using gcc 4.5.2.
--
Wireshark fails to decode NetFlow options which have system scope size != 4
bytes, although no such size is specified in RFC 3954.

Wireshark fails with:

[Dissector bug, protocol CFLOW: proto.c:1299: failed assertion "length == 4"]
   [Expert Info (Error/Malformed): proto.c:1299: failed assertion "length ==
4"]
       [Message: proto.c:1299: failed assertion "length == 4"]
       [Severity level: Error]
       [Group: Malformed]

Since no particular size is specified in RFC3954, the dissector should respect
the size in the received template and should not assert.

The attachment shows netflow options data with 16-byte system ID as scope.

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