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Date: Wed, 5 Feb 2014 16:37:15 +0000
From: "Rustein, Fara Denise (LATCO - Buenos Aires)" <frustein@...OITTE.com>
To: "full-disclosure@...ts.grok.org.uk" <full-disclosure@...ts.grok.org.uk>,
 "vuldb@...urityfocus.com" <vuldb@...urityfocus.com>, "vuln@...unia.com"
 <vuln@...unia.com>
Subject: Core FTP Server Vulnerabilities

"Core FTP Server Vulnerabilities"

******************************************************************************

- Affected Vendor: Core FTP Server
- Affected System: Core FTP Server software (Version 1.2, build 511, 32-bit)
- Vendor Disclosure Date: January 11th, 2014
- Public Disclosure Date: February 5th, 2014
- Vulnerabilities' Status: Fixed

******************************************************************************

Associated CVEs:

   1) CVE-2014-1441:
          Race condition leading to Denial of Service on the "AUTH SSL" command with invalid SSL data
          CWE-617: Reachable Assertion - http://cwe.mitre.org/data/definitions/617.html

   2) CVE-2014-1442:
          "XCRC" Directory Traversal Information Disclosure
          CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal') - http://cwe.mitre.org/data/definitions/22.html 

   3) CVE-2014-1443:
          Password Disclosure Vulnerability
          CWE-226: Sensitive Information Uncleared Before Release - https://cwe.mitre.org/data/definitions/226.html

******************************************************************************

DESCRIPTIONS
===========

1) CVE-2014-1441:
     Race condition leading to Denial of Service on the "AUTH SSL" command with invalid SSL data:

           We have observed that when using the AUTH SSL command, followed by invalid data, the CORE FTP application crashes.
           This would allow a remote malicious individual to generate a denial of service condition and disrupt services.

           + Proof of Concept:
                - Use the "AUTH SSL" command.
                - Hit the "enter" key twice.
                - Observe that the application crashes.

2) CVE-2014-1442:
      "XCRC" Directory Traversal Information Disclosure:

           We have observed that the CORE FTP software is vulnerable to Directory Traversal by leveraging the "XCRC" command.
           This allows a remote malicious individual to determine the existence of a file outside the current FTP root directory.

           + Proof of Concept:
                - Log in to the Core FTP Server.
                - Use the "XCRC" command with a filename that does not exist on the user designated root directory.
                - Observe the "550 File not found.." response.
                - Use the "XCRC" command with a filename belonging to a file residing directly outside the user designated root folder (one level higher than the root directory).
                - Observe the "550 File not found.." response.
                - Use the "XCRC" command with the same filename as before, but add "/../" in front of the file name.
                - Observe the 250 response.

3) CVE-2014-1443:
      Password Disclosure Vulnerability:

           We have observed that using a specifically crafted string it is possible to obtain the password belonging to the user that last logged in to the Core FTP Server.
           This appears to be related to a buffer size issue. The crafted string requires 211 characters in order to work.

           + Proof of Concept:
                - Log into the Core FTP Server with a valid user.
                - Close the terminal.
                - Use the "USER" command with the following string: "%xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx"
                - Observe that the previously used password is disclosed

******************************************************************************

- Fix information: http://coreftp.com/forums/viewtopic.php?t=2985707

- Related Links: Deloitte Argentina - www.deloitte.com/ar
- Feedback: If you have any questions, comments, concerns, updates or suggestions please feel free to send them to:
   + frustein@...oitte.com (tw: @fararustein)
   + lmartins@...oitte.com (@clucianomartins).

******************************************************************************

Credits:

CVE-2014-1441:
  1. Race condition leading to Denial of Service on the "AUTH SSL" command with invalid SSL data
  Discovered by Luciano Martins (lmartins@...oitte.com)

CVE-2014-1442:
  2. "XCRC" Directory Traversal Information Disclosure
  Discovered by Fara Rustein (frustein@...oitte.com)

CVE-2014-1443:
  3. Password Disclosure Vulnerability
  Discovered by Luciano Martins (lmartins@...oitte.com)

******************************************************************************

Fara Rustein | Senior Consultant
Cyber Security - Deloitte
The key is searching. Vs nfv zphz qsui ghzf zg xhv yvzqy gj tiwap.

 
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