Re: IIS 6 exploited

[Aarón Mizrachi <unmanarc () gmail com>]

On Martes 11 Agosto 2009 11:20:27 asai ajith escribió:
> Hi,
>
> One of our web server IIS 6 has been exploited, C:/inetpub/www/cats.txt was
> modified.
In order to know how was happened, you need to examine your:

- Logs.
- Folder permissions
- Scripts running on server (ASP/ASP.NET/PHP/JSP/CGI/whatever...)
- System policy (update policy, password policy, ...)
- Processes Running
- Time/Owner/... of cats.txt
- Other useful information.

My first recommendation that how to start.

1. DON'T DELETE THE FILE. Most people delete the file and destroy the evidence.
2. Create a HardDrive Image. I suggest you to use something like helix with 
dcfldd with an external hard drive. 

but, my personal recommendation: call an expert to do it. Some things could 
fail and destroy/damage the evidence and your site itself. 

----------
Why a forensic study are required?

I'm not implying that a forensic study means a police prosecution to the 
attacker. Maybe you don't want to. A forensic study could determine how the 
attack was possible, and maybe even: who.


> I would like to know how this is possible and what are corrective measures,
> thanks.
After the forensic image of the hard drive to determine how it happened...

I suggest you:

1. Microsoft Updates. 
2. Review the security policies at NTFS (enforce the permissions)
3. Review the security policies at IIS (CGI Folders, memory protections, ...)
4. Review the security policies at your scripting engine
5. Update any internal software (by example: asp websites).
6. Review the security policies at your OS
7. Firewall Review
8. ?

> Regards,
> Asai
>
>
>
>       Yahoo! recommends that you upgrade to the new and safer Internet
> Explorer 8. http://downloads.yahoo.com/in/internetexplorer/
>
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-- 
Ing. Aaron G. Mizrachi P.    

http://www.unmanarc.com
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