"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 () deloitte com (tw: @fararustein) + lmartins () deloitte 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 () deloitte com) CVE-2014-1442: 2. "XCRC" Directory Traversal Information Disclosure Discovered by Fara Rustein (frustein () deloitte com) CVE-2014-1443: 3. Password Disclosure Vulnerability Discovered by Luciano Martins (lmartins () deloitte com) ****************************************************************************** Fara Rustein | Senior Consultant Cyber Security - Deloitte The key is searching. Vs nfv zphz qsui ghzf zg xhv yvzqy gj tiwap. Deloitte se refiere a una o ms de las firmas miembros de Deloitte Touche Tohmatsu Limited, una compaña privada del Reino Unido limitada por garanta, y su red de firmas miembros, cada una como una entidad nica e independiente y legalmente separada. Una descripcin detallada de la estructura legal de Deloitte Touche Tohmatsu Limited y sus firmas miembros puede verse en el sitio web http://www.deloitte.com/about. 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