full-disclosure - Re: [SECURITY] CVE-2009-0580 Apache Tomcat User enumeration vulnerability with FORM authentication

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Message-ID: <4A27FAD3.8060202@christopherschultz.net>
Date: Thu, 04 Jun 2009 12:48:19 -0400
From: Christopher Schultz <chris@...istopherschultz.net>
To: Tomcat Users List <users@...cat.apache.org>
Cc: Tomcat Developers List <dev@...cat.apache.org>,
	full-disclosure@...ts.grok.org.uk, announce@...cat.apache.org,
	bugtraq@...urityfocus.com
Subject: Re: [SECURITY] CVE-2009-0580 Apache Tomcat User
 enumeration vulnerability with FORM authentication

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Mark,

On 6/3/2009 11:42 AM, Mark Thomas wrote:
> CVE-2009-0580: Tomcat information disclosure vulnerability

I know I'm likely to get a vague response, but could you provide some
more info about this issue?

> Due to insufficient error checking in some authentication classes,
> Tomcat allows for the enumeration (brute force testing) of usernames by
> supplying illegally URL encoded passwords.

[snip]

> j_username=tomcat&j_password=%

I'm not sure how the patch (I read the patch for TC5.5
DataSourceRealm.java) changes anything at all: it appears to be merely a
performance optimization.

No changes are made to the behavior of Tomcat, since the same null is
returned to the caller if the credentials do not match.

I don't see any information disclosure vulnerability in the first place,
and I don't see how your patch would have fixed it.

??!

- -chris
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