Penetration Testing mailing list archives
Re: info on dir traversal techniques, any?
From: H D Moore <sflist () digitaloffense net>
Date: Tue, 4 May 2004 04:19:24 -0500
On Monday 03 May 2004 06:16, Chan Fook Sheng wrote:
I am trying to get the application to display any files on the filesystem. I have ried appending %00 etc.. but to no avail. Anyone knows of more techniques to try?
For ASP scripts that pass user input directly into the FileSystemObject, you can use unicode tricks to perform a directory traversal. This nice thing about this attack is that there is no easy defense in the ASP language; Microsoft's own "secure" ShowCode.asp was vulnerable to this type of flaw. A sample traversal would look like: somebustedcode.asp?mahfile=%c0%ae%c0%ae%c0%af%c0%ae%c0%ae%c0%af%c0%ae%c0%ae%c0%af%c0%ae%c0%ae%c0%af%c0%ae%c0%ae%c0%afboot.ini
How can one determine whether a web application is opening files for read, hence making it possible for directory traversal attack?
Try passing a variety of invalid names and look for a difference in the returned error message. Using file names with reserved device names may return a non-standard response, same goes for files which contain bytes that are illegal in a file name... -HD ------------------------------------------------------------------------------ Ethical Hacking at the InfoSec Institute. Mention this ad and get $545 off any course! All of our class sizes are guaranteed to be 10 students or less to facilitate one-on-one interaction with one of our expert instructors. Attend a course taught by an expert instructor with years of in-the-field pen testing experience in our state of the art hacking lab. Master the skills of an Ethical Hacker to better assess the security of your organization. Visit us at: http://www.infosecinstitute.com/courses/ethical_hacking_training.html -------------------------------------------------------------------------------
Current thread:
- info on dir traversal techniques, any? Chan Fook Sheng (May 03)
- Re: info on dir traversal techniques, any? H D Moore (May 04)
- Re: info on dir traversal techniques, any? Chan Fook Sheng (May 06)
- Re: info on dir traversal techniques, any? H D Moore (May 04)