Wireshark-bugs: [Wireshark-bugs] [Bug 7438] New: SNMP incorrectly marks SNMPv3 "discovery" packe
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Thu, 5 Jul 2012 08:00:32 -0700 (PDT)
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=7438

           Summary: SNMP incorrectly marks SNMPv3 "discovery" packet as
                    malformed
           Product: Wireshark
           Version: 1.8.0
          Platform: x86-64
        OS/Version: Windows XP
            Status: NEW
          Severity: Normal
          Priority: Low
         Component: Dissection engine (libwireshark)
        AssignedTo: bugzilla-admin@xxxxxxxxxxxxx
        ReportedBy: alim.needham@xxxxxxxxxxxxxx


Created attachment 8723
  --> https://bugs.wireshark.org/bugzilla/attachment.cgi?id=8723
This is a screenshot of the wireshark saying that this is a malformed packet.

Build Information:
Version 1.8.0 (SVN Rev 43431 from /trunk-1.8)

Copyright 1998-2012 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 (64-bit) with GTK+ 2.24.10, with Cairo 1.10.2, with Pango 1.30.0, with
GLib 2.32.2, with WinPcap (4_1_2), with libz 1.2.5, without POSIX capabilities,
with SMI 0.4.8, 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 Jun 21 2012), with AirPcap.

Running on Windows XP Professional x64 Edition Service Pack 2, build 3790, 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++ 10.0 build 40219

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

Check the man page and http://www.wireshark.org for more information.
--
This is a legitimate packet that is sent when the local snmp agent wants to
"discover" the engine id of snmp remote agent. The agent replies with the
engine id and then the local agent can then encrypt the snmpv3 packet using the
engine id and username/password information.

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