[SA23656] b2evolution "redirect_to" HTML Attribute Cross-Site Scripting

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TITLE:
b2evolution "redirect_to" HTML Attribute Cross-Site Scripting

SECUNIA ADVISORY ID:
SA23656

VERIFY ADVISORY:
http://secunia.com/advisories/23656/

CRITICAL:
Not critical

IMPACT:
Cross Site Scripting

WHERE:
>From remote

SOFTWARE:
b2evolution 1.x
http://secunia.com/product/12768/

DESCRIPTION:
unsticky has discovered a vulnerability in b2evolution, which can be
exploited by malicious people to conduct cross-site scripting
attacks.

Input passed to the "redirect_to" parameter in htsrv/login.php is not
properly sanitised before being returned to the user. This can be
exploited to execute arbitrary HTML and script code in a user's
browser session in context of an affected site.

Successful exploitation allows adding additional attributes (e.g.
"onMouseOver") to the "Bypass login…" link.

The vulnerability is confirmed in version 1.8.6. Other versions may
also be affected.

SOLUTION:
Edit the source code to ensure that input is properly sanitised.

PROVIDED AND/OR DISCOVERED BY:
unsticky

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