WFTPD Pro Server long strings without an 0Ah byte causes denial of service

wftpd-string-0Ahbyte-dos (15341) The risk level is classified as MediumMedium Risk


WFTPD Pro Server is vulnerable to multiple denial of service conditions. A remote attacker, who is authenticated, can send multiple long strings (longer than 512 bytes) that contain characters without an 0Ah byte to cause the server to consume 100% of the available CPU resources and crash. If the attacker connects multiple times using long strings without an 0Ah byte, the attacker can cause WFTPD to consume 100% of the available CPU resources on the targeted system.


Denial of Service


Upgrade to the latest version of WFTPD (version 3.21 Release 2 or later), available from the Texas Imperial Software Web site. See References.


  • BugTraq Mailing List, Sat Feb 28 2004 - 15:49:59 CST: Multiple WFTPD Denial of Service vulnerabilities.
  • BID-9767: Multiple WFTPD Vulnerabilities
  • CVE-2004-0341: WFTPD Pro Server 3.21 Release 1 allocates memory for a command until a 0Ah byte (newline) is sent, which allows local users to cause a denial of service (CPU consumption) by continuing to send a long command that does not contain a newline.
  • OSVDB ID: 14764: Windows NT FTP Server (WFTP) Pro Server Unterminated Long Command DoS
  • OSVDB ID: 4115: Windows NT FTP Server (WFTP) Server CPU Utilization DoS
  • SA11001: WFTPD Server/Pro Server Multiple Vulnerabilities

Platforms Affected:

  • Texas Imperial Software WFTPD Pro Server 3.21 R1


Feb 28, 2004

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