Wireshark-bugs: [Wireshark-bugs] [Bug 8319] New: CAPWAP Header dissector returns invalid length
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Tue, 12 Feb 2013 07:59:05 +0000
Bug ID 8319
Summary CAPWAP Header dissector returns invalid length
Classification Unclassified
Product Wireshark
Version SVN
Hardware x86
OS All
Status UNCONFIRMED
Severity Major
Priority Low
Component Dissection engine (libwireshark)
Assignee bugzilla-admin@wireshark.org
Reporter paul.k.knoblauch@googlemail.com 

Created attachment 9976 [details]
Sample of Cisco CAPWAP

Build Information:

--
The problem is when Wireshark dissect CAPWAP packets from Cisco without
preference "Cisco Wireless Controller Support"

In this case the whole packet decoded wrong, not only Wireless Specific
Information field in CAPWAP header

It is minor problem, but that preference is turned off by default, and it is
hard to get to it when you're just working with 802.11 frames and know nothing
about CAPWAP

I suggest following patch to dissect_capwap_header function to always return
correct length of CAPWAP header based on HLEN header field

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