| Bug ID |
12922
|
| Summary |
TLS padding extension dissector length parsing bug
|
| Product |
Wireshark
|
| Version |
2.0.5
|
| Hardware |
x86
|
| OS |
Linux (other)
|
| Status |
UNCONFIRMED
|
| Severity |
Minor
|
| Priority |
Low
|
| Component |
Dissection engine (libwireshark)
|
| Assignee |
[email protected]
|
| Reporter |
[email protected]
|
Created attachment 14930 [details]
client hello with padding extension
Build Information:
Version 2.0.5
Copyright 1998-2016 Gerald Combs <[email protected]> and contributors.
License GPLv2+: GNU GPL version 2 or later
<http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>
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+ 3.20.9, with Cairo 1.14.6, with Pango 1.40.1, with
libpcap, with POSIX capabilities (Linux), with libnl 3, with libz 1.2.8, with
GLib 2.48.1, without SMI, with c-ares 1.11.0, with Lua 5.2, with GnuTLS 3.4.14,
with Gcrypt 1.7.3, with MIT Kerberos, with GeoIP, with PortAudio V19-devel
(built Dec 6 2015 12:27:18), without AirPcap.
Running on Linux 4.7.3-2-ARCH, with locale en_GB.UTF-8, with libpcap version
1.7.4, with libz 1.2.8, with GnuTLS 3.4.15, with Gcrypt 1.7.3.
Intel(R) Core(TM) i7-4790K CPU @ 4.00GHz (with SSE4.2)
Built using gcc 6.1.1 20160802.
Wireshark is Open Source Software released under the GNU General Public
License.
Check the man page and http://www.wireshark.org for more information.
--
The padding dissector expects the padding extension payload to carry length
while the RFC 7685 states that a correct encoding of extension should include
only zero bytes in extension_data.
Because of that, bytes in the padding extension are interpreted as zero length
server_name extensions.
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