https://bugs.wireshark.org/bugzilla/show_bug.cgi?id=6231
Summary: JPEG scans should be skipped instead of stopping the
dissection
Product: Wireshark
Version: 1.6.1
Platform: x86-64
OS/Version: Windows Vista
Status: NEW
Severity: Enhancement
Priority: Low
Component: Wireshark
AssignedTo: bugzilla-admin@xxxxxxxxxxxxx
ReportedBy: DXDragon@xxxxxxxxx
Build Information:
Version 1.6.1 (SVN Rev 38096 from /trunk-1.6)
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 (64-bit) with GTK+ 2.22.1, with GLib 2.26.1, with WinPcap (version
unknown), with libz 1.2.5, without POSIX capabilities, without libpcre, without
SMI, with c-ares 1.7.1, with Lua 5.1, without Python, with GnuTLS 2.10.3, with
Gcrypt 1.4.6, without Kerberos, with GeoIP, with PortAudio V19-devel (built Jul
18 2011), with AirPcap.
Running on 64-bit Windows Vista Service Pack 2, build 6002, 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 2.10.3, Gcrypt 1.4.6, without AirPcap.
Built using Microsoft Visual C++ 9.0 build 21022
Wireshark is Open Source Software released under the GNU General Public
License.
Check the man page and http://www.wireshark.org for more information.
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Currently, when Wireshark encounters the first entropy-coded segment in a JPEG
file, it stops dissection with the message:
"JFIF dissection stops here (dissection of a scan is not yet implemented)"
However, the design of the JPEG format allows to find the next marker even if
the entropy-coded segment is not decoded. Thus, a better strategy for Wireshark
would be to skip the entropy-coded segment and continue dissection at the next
marker.
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