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Re: Session data pollution vulnerabilities in web applications
From: "mailinglist mailinglist" <email-fulldisclosure () hotmail com>
Date: Thu, 12 Jan 2006 17:30:06 +0100

Hi Alla Bezroutchko,

Good recommendations.

This is not new - my guess, it's old. I have noted a few scripts/examples vulnerable to this previously, and would guess that we are not alone to have seen it before. "Yet another bad way to code PHP / ASP / Whatever" (TM).

But I never noticed the subtle variant you describe (perhaps since I never looked for it!), but a much more general/stupid variant:

$var = $_GET["something"];
$_SESSION["$var"] = $var2;

Yes. People do really code like that. Noted that one in some example posted in some php forum.




Anyway, there are probably a quite a lot of scripts which are vulnerable to this issue if php.ini is misconfigured (register_globals = on). Then we get the classic "if value not assigned, request parameter value will be injected" scenario which allready is known to enable several SQL Injections.

if (condition1) {
$var = 'SOMETHING';
}
if (condition2) {
$var = 'OTHER';
}
$_SESSION["$var"] = $var2;



Regards,
/someone

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