| Bug ID |
11296
|
| Summary |
Check Ipv4-Header-Total-Length
|
| Product |
Wireshark
|
| Version |
unspecified
|
| Hardware |
All
|
| OS |
All
|
| Status |
UNCONFIRMED
|
| Severity |
Enhancement
|
| Priority |
Low
|
| Component |
Dissection engine (libwireshark)
|
| Assignee |
bugzilla-admin@wireshark.org
|
| Reporter |
tuberkulum@gmx.de
|
Created attachment 13681 [details]
7 corrupted testframes, #4+ #6 apply to the enhancement.
Build Information:
Version 1.12.5 (v1.12.5-0-g5819e5b from master-1.12)
Copyright 1998-2015 Gerald Combs <gerald@wireshark.org> 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+ 2.24.23, with Cairo 1.10.2, with Pango 1.34.0, with
GLib 2.38.0, with WinPcap (4_1_3), with libz 1.2.5, with SMI 0.4.8, with c-ares
1.9.1, with Lua 5.2, without Python, with GnuTLS 3.2.15, with Gcrypt 1.6.2,
without Kerberos, with GeoIP, with PortAudio V19-devel (built May 12 2015),
with
AirPcap.
Running on 64-bit Windows 7 Service Pack 1, build 7601, with WinPcap version
4.1.3 (packet.dll version 4.1.0.2980), based on libpcap version 1.0 branch
1_0_rel0b (20091008), GnuTLS 3.2.15, Gcrypt 1.6.2, without AirPcap.
Intel(R) Core(TM)2 Duo CPU E8400 @ 3.00GHz, with 4029MB of physical
memory.
Built using Microsoft Visual C++ 10.0 build 40219
--
PROBLEM:
Wireshark should detect corrupted IPv4 Header field 'Total-Length'
(too-big/too-small).
DETAILS:
A kind of conformancetest sends ethernet frames with always the same IPv4/UDP
payload. For test purpose, the testtool changes single fields of the IP header
only, e.g. the IP-HDR-CRC (which is detected by WS). But if the 'Total Length'
field of the IPv4 Header s varied (too-small/too-big), WS tells nothing -
although WS should be able to detect it with the help of the overall content of
the ethernet frames.
TEST FRAMES:
I attached a capture with 7 corrupted testframes, where #4 + #6 are the
relevant ones:
no.4 - IP-Header-Total-Length set to 197 (instead of 192)
no.6 - IP-Header-Total-Length set to 224 (instead of 192)
OTHER LINKS:
a) Bug ID 10519 seems to cover a similar - but not the same problem.
(https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=10519)
b) This enhancement proposal was issued due to my questions in the WS forum.
(https://ask.wireshark.org/questions/43432/ws-does-not-check-ipv4-header-total-length)
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