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

From: Christopher Schultz <chris@christopherschultz.net>
To: Tomcat Users List <users@tomcat.apache.org>
Cc: announce@tomcat.apache.org,Tomcat Developers List <dev@tomcat.apache.org>,full-disclosure@lists.grok.org.uk,bugtraq@securityfocus.com
Subject: Re: [SECURITY] CVE-2009-0580 Apache Tomcat User enumeration vulnerability- with FORM authentication
Date:


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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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