FWIW here is an exploit a wrote a long while back that partly abuses a weak
AMF endpoint (xxe, not sqli...).

http://packetstormsecurity.com/files/126703/HP-Release-Control-9.20.0000-Build-395-XXE.html

However, I distinctly remember having to keep the admin password the same
length as my base AMF request (because I was lazy and didn't feel like
having to update the integer as well). See the change_admin_password
method. I basically base64 encoded the request in order to store the base
request, then decoded it and modified it based on what I wanted to do.

You could make a few requests with different sized usernames to find the
integer that you will need to manipulate during exploitation.

On Thu, May 28, 2015 at 1:59 PM, Brandon Perry <bperry.volat...@gmail.com>
wrote:

> Flex is hard because you have to update the integer that tells flex how
> long a string is, unless I am mistaken.
>
> If not, you could try with the * marker to tell sqlmap exactly where the
> injection point is.
>
> On Thu, May 28, 2015 at 1:21 PM, Christopher Downs <
> chris.do...@chromeriver.com> wrote:
>
>> Good afternoon gents,
>> I am a profession penetration tester and have a rather difficult
>> injection point for one of my customers.
>>
>> I can trigger the exception by pausing traffic with burp and inserting
>> NULL's into the user | pass via a back end flex call. Is there a way to
>> take advantage of sqlmap to inject via flex remoting objects ?
>>
>> If not I will have to write this myself but I thought I may ask the list
>> first.
>>
>> Thanks.
>> Sincerely,
>> Christopher M Downs
>>
>> --
>> [image: Description: Chrome]
>>
>> Chris Downs | System Administrator
>>
>> main
>>
>> 888.781.0088
>>
>> email
>>
>> *chris.do...@chromeriver.com <chris.do...@chromeriver.com>*
>>
>> web
>>
>> www.chromeriver.com
>>
>>
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>>
>
>
> --
> http://volatile-minds.blogspot.com -- blog
> http://www.volatileminds.net -- website
>



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