Third-party attackers who can reach the system can logon using any username/password combination. The two FTP services (default ports 21/tcp and 5411/tcp) of the SiNVR 3 Video Server contain a path traversal vulnerability that could allow an authenticated remote attacker to access and download arbitrary files from the server, if the FTP services are enabled.ī / Authentication Bypass RCE - the malware listens on TCP port 21 and TCP ports 14920 to 14923. The FTP service on Janitza UMG 508, 509, 511, 604, and 605 devices has a default password, which makes it easier for remote attackers to read or write to files via a session on TCP port 21.Ī vulnerability was discovered in Siemens OZW672 (all versions) and OZW772 (all versions) that could allow an attacker with access to port 21/tcp to access or alter historical measurement data stored on the device.Ī vulnerability has been identified in SiNVR 3 Central Control Server (CCS) (all versions), SiNVR 3 Video Server (all versions). The FTP service in QNAP iArtist Lite before 1.4.54, as distributed with QNAP Signage Station before 2.0.1, has hardcoded credentials, which makes it easier for remote attackers to obtain access via a session on TCP port 21. An attacker could exploit this vulnerability using TCP port 21 to gain administrative access to the device. TURCK BL20 / BL67 could allow a remote attacker to bypass security restrictions, caused by the use of hardcoded credentials for the FTP service. ()įTP proxy server for Novell BorderManager 3.6 SP 1a allows remote attackers to cause a denial of service (network connectivity loss) via a connection to port 21 with a large amount of random data. Also opens a backdoor on a random tcp port and/or port 80/udp. It exploits the MS Plug and Play Buffer Overflow vulnerability (MS Security Bulletin ) on port 21/tcp., and by sending copies of itself to gathered email addresses. Trojan horses/backdoors that also use this port: 7tp trojan, MBT, Back Construction, Blade Runner, Cattivik FTP Server, CC Invader, Dark FTP, Doly Trojan, Fore, Invisible FTP, Juggernaut 42, Larva, MotIv FTP, Nerte 7.8.1, Net Administrator, Ramen, Senna Spy FTP server, The Flu, Traitor 21, WebEx, WinCrash,, , - a mass-mailing worm that opens a backdoor and lowers security settings on the compromised computer. Restart chkservd so that the change is applied to /etc/chkserv.File Transfer Protocol - some network devices may be listening on this port, such as NAT routers for remote access/private cloud storage and network attached multi-function printers (scan to ftp feature).Īsus RT routers may open an internet accessible FTP server for USB-attached storage, configurable in administration panel under "USB Application > Servers Center > FTP Share" Service=6021,QUIT,220,/usr/local/cpanel/scripts/restartsrv_ftpserver,proftpd||pure-ftpd&pure-authd,root|nobody,220|USER %service_auth_user%|3|PASS %service_auth_pass%|2|QUITĦ. # cat /usr/local/cpanel/src/chkservd/chkserv.d/ftpd This will ensure that the service is able to be properly monitored: Be sure to also update the port listed in the file /usr/local/cpanel/src/chkservd/chkserv.d/ftpd (shown as 6021 below). For example, I used port 6021:ĬOMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME Confirm the FTP service is now listening on the new port number. # /scripts/setupftpserver pure-ftpd -forceĤ. To apply your changes, perform a force update of FTP with the following command: An example of this file's contents when setting "Bind" is included below:ģ. Make sure that you select a port that is not already in use by another service, and ensure that the port is not blocked by your firewall software or otherwise inaccessible. Set the port number the to the port of your choosing using the "Bind" variable. Use your preferred text editor, such as vi or nano to create or edit the /var/cpanel/conf/pureftpd/local file.Ģ. If you want to change the port that is used to connect to the FTP server, you will need to modify the configuration file then restart the service.ġ.
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