Little insight on LFI
https://www.flowdock.com was vulnerable to a directory traversal / local file inclusion vulnerability. As a result, it was possible for an attacker to load webserver-readable files from the local filesystem.
How This work..?
On the Flowdock API documentation source files in a separate, public GitHub repository. This allows anyone to contribute and report issues, or ask questions in public. they serve the documentation in Rails by rendering markdown as HTML and injecting the generated HTML files as views.
To avoid adding a new route every time we add a new page, our route file had the following rule:
get '/api/*action', controller: 'docs'
In this setup the controller is only responsible for setting up the layout.
A request such as
api
//%5c../%5c../%5c../%5c../%5c../%5c../%5c../etc/passwd/
Or
api/%5C../%5C../%5C../Gemfile
exposed files outside of Rails’ view paths.
'%5C'
turns into '\'
after decoding. UsingRack::Protection didn’t help as it only rejects
'/../'
segments in the request path. My Finding....
In
the above summary it only rejects
'/../'
segments in the request path and path is not sanitized to filter out
malicious characters like "..%5c", It is easily possible to access any
file which is locally stored on the system outside the root directory.Now
coming
back to Flowdock.com
here is the proof of
concept that I included with the bug. It displayed the contents of the
/etc/passwd file of the Flowdock.com server
The vulnerability was resolved now and more Info about Fix
More about
The vulnerability mentioned here has been confirmed fixed by Flowdock Team.
I’d like to thank Otto Hilska , Tuomas Silen and ville Lautanal for handling this
issue and the vulnerability was patched and the fix was
deployed in production about two and a half after my initial report.
Its my first writing for poc....
Blog Writing style copied from Neal Poole blog thanks for write such a great blog.....
Its my first writing for poc....
Blog Writing style copied from Neal Poole blog thanks for write such a great blog.....
great finding ... :) keep it up bro....
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