War FTP Daemon 1.70 is beta software, and will be replaced with a new major version early next year. The development on the 1.70 source tree has stopped, and no new versions of 1.7* is planned, - unless some serious security problems are reported. The Remote D.o.S Attack does stall the server. There is however no indication of any buffer-overflow problems or other security-related problems. The attack is logged to the server-log if the default log options are enabled. An attack of this type may look like this in the server log: I 12/17/99 02:19:43 FTPD:test21:0001 (User=18446744073709551615 ) [WarFTPD::OnAccept()] Client (193.91.161.151:4496->193.91.161.20:21) is connected to the FTP server. I 12/17/99 02:19:43 FTPD:test21:0002 (User=18446744073709551615 ) [WarFTPD::OnAccept()] Client (193.91.161.151:4497->193.91.161.20:21) is connected to the FTP server. I 12/17/99 02:19:43 FTPD:test21:0003 (User=18446744073709551615 ) [WarFTPD::OnAccept()] Client (193.91.161.151:4498->193.91.161.20:21) is connected to the FTP server. ... A large number of connections from a single IP address at the same time indicate an attack. If logging of debug messages are enabled, the log will also show something like this: D 12/17/99 02:19:48 FTPD:test21:000e (User=18446744073709551615 ) [WarFTPDControlSck::OnCommand()] Got command ".blsJw{aP.q" D 12/17/99 02:19:48 FTPD:test21:000e (User=18446744073709551615 ) [WarFTPDControlSck::OnCommand()] Got command "}DGqDYH" D 12/17/99 02:19:48 FTPD:test21:000e (User=18446744073709551615 ) [WarFTPDControlSck::OnCommand()] Got command "05(N^ mPÓ’¹àÌáø2Qc|" War FTP Daemon 3.0 will have three levels of protection for this and similar attacks: - 1) Dynamic interaction with firewall software to lock out flooders - 2) Fast accept(); close(); cycles when connections are made too fast - 3) Traffic analysis and temporary lock-outs for hosts that make too many connection attempts (hammering protection). Jarle - Jarle Aase Author of freeware. For support/suggestions: alt.comp.jgaa (newsgroup) For information: infoat_private(email, auto-responder) Private Email: jgaaat_private WWW: http://www.jgaa.com/ <no need to argue - just kill'em all!> > -----Original Message----- > From: Bugtraq List [mailto:BUGTRAQat_private]On Behalf Of Ussr > Labs > Sent: Tuesday, December 14, 1999 7:57 AM > To: BUGTRAQat_private > Subject: Local / Remote D.o.S Attack in War FTP Daemon 1.70 > Vulnerability > > > Local / Remote D.o.S Attack in War FTP Daemon 1.70 Vulnerability > > PROBLEM > > UssrLabs found a Local/Remote DoS Attack in War FTP Daemon 1.70 > the buffer overflow is caused by a Multiples connections at the same time > (over 60) in the ftp server , and some characters in the login name. > > There is not much to expand on.... just a simple hole > > For the source / binary of this remote / local D.O.S > Go to: http://www.ussrback.com/ > > Vendor Status: > Contacted. > > Vendor Url: http://www.jgaa.com > Program Url: http://www.jgaa.com/warftpd.htm > > Credit: USSRLABS > > SOLUTION > Nothing yet. > > > u n d e r g r o u n d s e c u r i t y s y s t e m s r e s e a r c h > http://www.ussrback.com >
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