https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=7047
Summary: bootp dissector issue with dhp option 82 - suboption 9
Product: Wireshark
Version: 1.6.7
Platform: x86-64
OS/Version: Mac OS X 10.6
Status: NEW
Severity: Major
Priority: Low
Component: Wireshark
AssignedTo: bugzilla-admin@xxxxxxxxxxxxx
ReportedBy: stefb12@xxxxxxxxx
Build Information:
Version 1.6.7 (SVN Rev 41973 from /trunk-1.6)
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+ 2.24.5, with GLib 2.29.8, with libpcap (version
unknown), with libz 1.2.3, without POSIX capabilities, without libpcre, with
SMI
0.4.8, without c-ares, without ADNS, with Lua 5.1, without Python, with GnuTLS
2.12.7, with Gcrypt 1.4.6, with MIT Kerberos, with GeoIP, with PortAudio
V19-devel (built Sep 30 2011 11:17:29), without AirPcap.
Running on Mac OS 10.6.8 (Darwin 10.8.0), with libpcap version 1.0.0, with libz
1.2.3, GnuTLS 2.12.7, Gcrypt 1.4.6.
Built using gcc 4.2.1 (Apple Inc. build 5666) (dot 3).
--
http://anonsvn.wireshark.org/viewvc/releases/wireshark-1.6.7/epan/dissectors/packet-bootp.c?revision=41974&view=markup
line 2158
the code does not seem to check against the datalen (Length) of suboption 9 to
parse the next suboptions
as a result, if there are multiple suboptions in dhcp option 82
e.g suboption 9, suboption 1, suboption x, suboption y
the dissector ends up by not seeing the following suboptions in the packet and
will wrongly consider these other suboptions as being part of suboption 9
from RFC 4243
0 1 2 3
0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Code | Length | Enterprise Number1 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| | DataLen1 | |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ +
\ Suboption Data1 \
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| Enterprise Number2 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
| DataLen2 | Suboption Data2 |
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
\ \
. .
. .
+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
--
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