This is not sufficient protection against injection attacks. A malicious user can easily create a URL with a path of "/1/2/3/", which will be handled by the server as "/1/2/". In order to exploit this issue, a user would have to be running a vulnerable server, and have the ability to input redirection characters into the server's input. This is likely to occur when running a Python script on a web server for the first time, or on an old version of Python. It is recommended to upgrade to a newer version of Python if possible, or to use an alternative server.

2.4.1 Temporary Redirects

This issue is addressed by the temporary redirects code path in the request handling code. When an HTTP server receives a request for a file or directory which does not exist on the server, it should first check to see if that URL has been processed previously. If it has, it should send back a temporary redirect response. This will tell the client that they must follow a link in order to continue their request, and when they do so, they will be re-directed to the correct URL.

How do I check if my server is vulnerable?

To check if your server is vulnerable, you may use the following code:
import urllib2
query = "http://www.example.com/1/2/" + "3/"
response = urllib2.urlopen(query)
print response.info()
True
False

Source: https://github.com/nvd3/nvd3-presentation/blob/master/web-appsec-notes-2015 .pdf


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Information disclosure

This issue exists because of a flaw in the way that the server handles URLs. The server may be vulnerable to an injection attack when handling URLs with a path of "/1/2/3/". This can result in information disclosure and allow malicious users to access sensitive data.

Timeline

Published on: 08/23/2022 01:15:00 UTC
Last modified on: 09/27/2022 23:15:00 UTC

References