Re: how can LDAP injection blocked?

[Yancey Y. <ya...@un...>]

I believe he is asking how to defend against potential web-based LDAP  
filter injection attacks (similar to SQL injection attacks), or  
generally how to validate user input. I think there are better forums  
elsewhere (OpenLDAP perhaps) for asking this question.

There is a potential for abuse with some filters, but I do not see any  
way to abuse the "(&(objectClass=inetOrgPerson)(uid=$input))" filter.  
As mete wrote, it's easy to enter something that makes the filter  
invalid. I just can't think of anything extra a person could type that  
would be a valid filter and return unwanted data.

Unlike SQL, the returned attributes are not specified in the LDAP  
filter string, so there is limited potential for abuse.

Yancey


On Apr 28, 2009, at 10:08 AM, mete wrote:

>
>>
>> i guess what he means is something like this: imagine the following  
>> filter:
>>
>> (&(objectClass=inetOrgPerson)(uid=$input))
>>
>> where $input comes from a web form, or similar. if $input==')' you  
>> get
>>
>> (&(objectClass=inetOrgPerson)(uid=)))
>>
>> which is invalid.
>>
>> so some form of input validation must be used.
>>
>> please correct me if i'm wrong
>>
>> best regards
>> burak
> It's have a login window. You can write your dn and password, after  
> login you
> can search, list etc. But it's not to be too security. How can i  
> stop them?
>
> Sorry for my english. It's not good at all. good day.
>
> ------------------------------------------------------------------------------
> Register Now & Save for Velocity, the Web Performance & Operations
> Conference from O'Reilly Media. Velocity features a full day of
> expert-led, hands-on workshops and two days of sessions from industry
> leaders in dedicated Performance & Operations tracks. Use code  
> vel09scf
> and Save an extra 15% before 5/3. http://p.sf.net/sfu/velocityconf
> _______________________________________________
> Python-LDAP-dev mailing list
> Pyt...@li...
> https://lists.sourceforge.net/lists/listinfo/python-ldap-dev