DrayTek VigorACS SI 1.3.0 – Multiple Vulnerabilities

• Exploit Database
• 14 阅读

• 作者： Digital Misfits
  日期： 2014-10-09
• 类别：

  • webapps
  平台：

  • jsp
• 来源：https://www.exploit-db.com/exploits/34928/

• DrayTek VigorACS SI ( <= 1.3.0)
  
  Vigor ACS-SI Edition is a Central Management System for DrayTek
  routers and firewalls,
  providing System Integrators or system administration personnel a
  real-time integrated
  monitoring, configuration and management platform.
  
  -----------------------------------------------------------------------
  2.1. Default http-auth username/password used for <ip>/ACSServer/*
  
  We found that most of the VigorACS SI deployments are using the
  default http authentication settings (acs/password). This is not so much
  a software vulnerability but more a configuration issue.
  
  
  2.2 Unauthenticated arbitrary file read/write functionality via
  UploadDownloadServlet
  
  The UploadDownloadServlet can be used to (read and) write files to the
  server directly. In addition, this functionality is accessible without
  having to provide the
  http authentication details (2.1).
  
  
  2.3. Path traversal and Local File Inclusion in the FileServlet
  
  The regular expression that is used to prevent this is not sufficient:
  it removes occurences of '../' (without the quotes). By providing input
  like '....//', the middle '../' will be removed, while the remainder
  equals to '../'. We could now use the FileServlet to access any file on
  the server:
  <ip>/ACSServer/FileServlet?f=....//....//....//....//....//....//....//etc/passwd
  
  
  2.4. Arbitrary file upload in <ip>/ACSServer/UploadFileServlet
  
  This servlet suffers from the same path traversal vulnerability as
  described in 2.2. You can POST data to this servlet to upload files
  into arbitrary
  locations:
  http://<ip>//ACSServer/UploadFileServlet?prefix=<URLENCODED('a&....//....//....//....//....//server/default/deploy/web.war/shell.jsp&a&a&a&a')>
  
  The UploadFileServlet will append '.cfg' to the given filename, this means files
  uploaded via this mechanism aren't directly of use by an attacker. However, when
  the payload is a ZIP archive, the vuln. in 2.5 (Local unzip functionality)
  can be used to unpack an otherwise benign file into an full-blown
  remote web-shell.
  
  
  2.5. Local unzip functionality
  
  The RPC server provides an unzip functionality (rpcmanager.UnZip) that can be
  invoked by using the AMF message broker (accessible via
  http://<ip>/ACSServer/messagebroker/amf). This functionality can be used
  to unzip any file on the file system like one that has been previously uploaded
  using the UploadFileServlet vuln.
  
  
  2.6. ACS runs as root
  
  The webservice is running as the root user.
  
  -----------------------------------------------------------------------
  
  Timetable:
  
  2014-09-26 : Vender released patches (private and unverified) to their customers
  2014-07-22 : Vendor states that most of the vulns. are patched
  2014-07-08 : Vendor notified customers with large deployments
  2014-06-30 : Response of Vendor
  2014-06-24 : Notified Vendor
  
  Researchers:
  Victor van der Veen (vvdveen@cs.vu.nl)
  Erik-Paul Dittmer (epdittmer@digitalmisfits.com)
  
  
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