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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
About: This Advisory was delivered by Secunia as a free service to help everybody keeping their systems up to date against the latest vulnerabilities.
Definitions: (Criticality, Where etc.) http://secunia.com/about_secunia_advisories/
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