========================== Django 1.5.9 release notes ========================== *Under development* Django 1.5.9 fixes several security issues in 1.5.8. :func:`~django.core.urlresolvers.reverse()` could generate URLs pointing to other hosts ======================================================================================= In certain situations, URL reversing could generate scheme-relative URLs (URLs starting with two slashes), which could unexpectedly redirect a user to a different host. An attacker could exploit this, for example, by redirecting users to a phishing site designed to ask for user's passwords. To remedy this, URL reversing now ensures that no URL starts with two slashes (//), replacing the second slash with its URL encoded counterpart (%2F). This approach ensures that semantics stay the same, while making the URL relative to the domain and not to the scheme. File upload denial-of-service ============================= Before this release, Django's file upload handing in its default configuration may degrade to producing a huge number of ``os.stat()`` system calls when a duplicate filename is uploaded. Since ``stat()`` may invoke IO, this may produce a huge data-dependent slowdown that slowly worsens over time. The net result is that given enough time, a user with the ability to upload files can cause poor performance in the upload handler, eventually causing it to become very slow simply by uploading 0-byte files. At this point, even a slow network connection and few HTTP requests would be all that is necessary to make a site unavailable. We've remedied the issue by changing the algorithm for generating file names if a file with the uploaded name already exists. :meth:`Storage.get_available_name() ` now appends an underscore plus a random 7 character alphanumeric string (e.g. ``"_x3a1gho"``), rather than iterating through an underscore followed by a number (e.g. ``"_1"``, ``"_2"``, etc.).