Wireshark-bugs: [Wireshark-bugs] [Bug 1756] New: BGP MP_(UN)REACH_NLRI parsing broken
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From: bugzilla-daemon@xxxxxxxxxxxxx
Date: Mon, 20 Aug 2007 22:35:04 +0000 (GMT)
http://bugs.wireshark.org/bugzilla/show_bug.cgi?id=1756

           Summary: BGP MP_(UN)REACH_NLRI parsing broken
           Product: Wireshark
           Version: 0.99.6
          Platform: Macintosh
        OS/Version: Mac OS X 10.4
            Status: NEW
          Severity: Normal
          Priority: Low
         Component: Wireshark
        AssignedTo: wireshark-bugs@xxxxxxxxxxxxx
        ReportedBy: dhelder@xxxxxxxxxxxxxx


Build Information:
wireshark 0.99.6

Copyright 1998-2007 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 with GTK+ 2.10.12, with GLib 2.12.12, with libpcap 0.9.5, with libz
1.2.3, without libpcre, without Net-SNMP, without ADNS, without Lua, without
GnuTLS, without Gcrypt, with MIT Kerberos, without PortAudio, without AirPcap.
NOTE: this build doesn't support the "matches" operator for Wireshark filter
syntax.

Running on Darwin 8.10.1, with libpcap version 0.9.5.

Built using gcc 4.0.1 (Apple Computer, Inc. build 5367).
--
The MP_REACH_NLRI (and MP_UNREACH_NLRI) parser incorrectly increments a buffer
offset.  Any attributes following will be skipped and/or parsed incorrectly. 
No security problem I see - the bounds are checked before parsing each
attribute.

Patch attached.


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