ColoradoFTP 1.3 Prime Edition (Build 8) – Directory Traversal

• Exploit Database
• 86 阅读

• 作者： Rv3Laboratory
  日期： 2016-08-11
• 类别：

  • webapps
  平台：

  • java
• 来源：https://www.exploit-db.com/exploits/40231/

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  01. ### Advisory Information ###
  
  Title: Directory Traversal Vulnerability in ColoradoFTP v1.3 Prime 
  Edition (Build 8)
  Date published: n/a
  Date of last update: n/a
  Vendors contacted: ColoradoFTP author Sergei Abramov
  Discovered by: Rv3Laboratory [Research Team]
  Severity: High
  
  
  02. ### Vulnerability Information ###
  
  OVE-ID: OVE-20160718-0006
  CVSS v2 Base Score: 8.5
  CVSS v2 Vector: (AV:N/AC:M/Au:S/C:C/I:C/A:C)
  Component/s: ColoradoFTP Core v1.3
  Class: Path Traversal
  
  
  03. ### Introduction ###
  
  ColoradoFTP is the open source Java FTP server. It is fast, reliable and 
  extendable.
  Fully compatible with RFC 959 and RFC 3659 (File Transfer Protocol and 
  Extensions)
  this implementation makes it easy to extend the functionality with 
  virtually any feature.
  Well commented source code and existing plug-ins make it possible to 
  shape the
  FTP server just the way you want!
  
  http://cftp.coldcore.com/
  
  04. ### Vulnerability Description ###
  
  The default installation and configuration of Colorado FTP Prime Edition 
  (Build 8) is prone to a
  security vulnerability. Colorado FTP contains a flaw that may allow a 
  remote attacker to traverse directories on the FTP server.
  A remote attacker (a colorado FTP user) can send a command (MKDIR, PUT, 
  GET or DEL) followed by sequences (\\\..\\) to traverse directories
  and create, upload, download or delete the contents of arbitrary files 
  and directories on the FTP server.
  To exploit the vulnerability It is important to use "\\\" at the 
  beginning of string.
  
  
  05. ### Technical Description / Proof of Concept Code ###
  
  By supplying "\\\..\\..\\..\\..\\" in the file path, it is possible to 
  trigger a directory traversal flaw, allowing the attacker
  (anonymous user or Colorado FTP user) to upload or download a file 
  outside the virtual directory.
  
  
  05.01
  We tried to upload a file (netcat - nc.exe), to Windows %systemroot% 
  directory (C:\WINDOWS\system32\) using a PUT command:
  
  ftp> put nc.exe \\\..\\..\\..\\Windows\\system32\\nc.exe
  
  Netcat was successfully uploaded.
  
  
  05.02
  We tried to create a directory (test), using a MKDIR command:
  
  ftp> mkdir nc.exe \\\..\\..\\..\\test
  
  The directory test was successfully created.
  
  
  06. ### Business Impact ###
  
  This may allow an attacker to upload and download files from remote machine.
  
  
  07. ### Systems Affected ###
  
  This vulnerability was tested against: ColoradoFTP v1.3 Prime Edition 
  (Build 8)
  O.S.: Microsoft Windows 7 32bit
  JDK: v1.7.0_79
  Others versions are probably affected too, but they were not checked.
  
  
  08. ### Vendor Information, Solutions and Workarounds ###
  
  This issue is fixed in ColoradoFTP Prime Edition (Build 9),
  which can be downloaded from:
  
  http://cftp.coldcore.com/download.htm
  
  
  09. ### Credits ###
  
  Rv3Laboratory [Research Team] - www.Rv3Lab.org
  
  This vulnerability has been discovered by:
  Rv3Lab - [www.rv3lab.org] - research(at)rv3lab(dot)org
  Christian Catalano aka wastasy - wastasy(at)rv3lab(dot)org
  Marco Fornaro aka Chaplin89 - chaplin89(at)rv3lab(dot)org
  
  
  10. ### Vulnerability History ###
  
  July 07th, 2016: Vulnerability discovered.
  July 19th, 2016: Vendor informed. [Colorado FTP team]
  July 21st, 2016: Vendor responds asking for details.
  July 28th, 2016: Sent detailed information to the vendor.
  August 08th, 2016: Vendor confirms vulnerability.
  August 10th, 2016: Vendor reveals patch release date.
  August 11th, 2016: Vulnerability disclosure
  
  
  11. ### Disclaimer ###
  
  The information contained within this advisory is supplied "as-is" with
  no warranties or guarantees of fitness of use or otherwise.
  We accept no responsibility for any damage caused by the use or misuse of
  this information.
  
  
  12. ### About Rv3Lab ###
  
  Rv3Lab is an independent Security Research Lab.
  For more information, please visit [www.Rv3Lab.org]
  For more information regarding the vulnerability feel free to contact the
  Rv3Research Team: research(at)rv3lab(dot)org
  
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