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From Mark Thomas <ma...@apache.org>
Subject Re: Bug 51698 - ajp CPing/Forward-Request packet forgery
Date Fri, 02 Sep 2011 13:39:21 GMT
On 02/09/2011 14:33, Edward Quick wrote:
> Thanks Mark.  The report says this makes (previous versions of) Apache Tomcat vulnerable
to an authentication bypass and information disclosure, so I'm was just trying to understand
how the example demonstrates that?

The example shows that Tomcat process an AJP message that was entirely
controlled by the attacker rather than the reverse proxy. Tomcat trusts
that information in the AJP message (authenticated user name, client IP
address, etc) are correct. If an attacker can control the AJP message
then things like authentication or filters based on client IP address
etc can all be bypassed.

Additionally, processing this extra request can cause Tomcat to start
mixing up responses to requests.

Mark

> 
> -----Original Message-----
> From: Mark Thomas [mailto:markt@apache.org] 
> Sent: 02 September 2011 14:18
> To: Tomcat Users List
> Subject: Re: Bug 51698 - ajp CPing/Forward-Request packet forgery
> 
> On 02/09/2011 14:12, Edward Quick wrote:
>> Hi there,
>>
>> I was testing out the packet forgery example (at https://issues.apache.org/bugzilla/show_bug.cgi?id=51698)
>> to see if my site was vulnerable and got the following results.
>> I'm not sure looking at the code comments in ForwardRequestForgeryExample.java
>> if the output below means it's vulnerable and what exactly that exploited.
> 
> Yes, you are vulnerable.
> 
> The attack exploits a bug in the AJP connector you have configured.
> 
>> Could someone give me a hand please?
> 
> See above.
> 
> Mark
> 
>>
>> Thanks,
>>
>> Ed.
>>
>> C:>java -cp . ForwardRequestForgeryExample
>> Sending AJP Forward-Request Packet...
>> End
>>
>> $ tail -f catalina.out
>> Invoke HelloWorldExample.doPost method:
>> -------------------------------------------
>> Host: my.evil-site.com
>> RemoteAddr: 1.2.3.4
>> LocalPort: 999
>> woo: I am here
>>
>>
>>
>>
>>
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