Wireshark-bugs: [Wireshark-bugs] [Bug 5426] New: DHCPv6 OPTION_CLIENT_FQDN parse error
https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=5426

           Summary: DHCPv6 OPTION_CLIENT_FQDN parse error
           Product: Wireshark
           Version: 1.4.2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Minor
          Priority: Low
         Component: Wireshark
        AssignedTo: [email protected]
        ReportedBy: [email protected]


Build Information:
Version 1.4.2 (SVN Rev 34959 from /trunk-1.4)

Copyright 1998-2010 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 (32-bit) with GTK+ 2.16.6, with GLib 2.22.4, with WinPcap (version
unknown), with libz 1.2.3, without POSIX capabilities, without libpcre, with
SMI
0.4.8, with c-ares 1.7.1, with Lua 5.1, without Python, with GnuTLS 2.8.5, with
Gcrypt 1.4.5, with MIT Kerberos, with GeoIP, with PortAudio V19-devel (built
Nov
18 2010), with AirPcap.

Running on Windows XP Service Pack 3, build 2600, 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 2.8.5, 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.
--
When parsing the OPTION_CLIENT_FQDN the DHCPv6 dissector makes this mistake:

    case OPTION_CLIENT_FQDN:
....
            dhcpv6_domain(subtree, tvb, off-1, optlen-1);

which should be:

            dhcpv6_domain(subtree, tvb, off+1, optlen-1);

rolling forward skipping the flags, i.s.o. rolling back to the option length
itself, always triggering "Malformed DNS name record (MS Vista client?)".

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