Django 3.2.4 release notes

June 2, 2021

Django 3.2.4 fixes two security issues and several bugs in 3.2.3.

CVE-2021-33203: Potential directory traversal via admindocs

Staff members could use the admindocs TemplateDetailView view to check the existence of arbitrary files. Additionally, if (and only if) the default admindocs templates have been customized by the developers to also expose the file contents, then not only the existence but also the file contents would have been exposed.

As a mitigation, path sanitation is now applied and only files within the template root directories can be loaded.

CVE-2021-33571: Possible indeterminate SSRF, RFI, and LFI attacks since validators accepted leading zeros in IPv4 addresses

URLValidator, validate_ipv4_address(), and validate_ipv46_address() didn’t prohibit leading zeros in octal literals. If you used such values you could suffer from indeterminate SSRF, RFI, and LFI attacks.

validate_ipv4_address() and validate_ipv46_address() validators were not affected on Python 3.9.5+.

Bugfixes

  • Fixed a bug in Django 3.2 where a final catch-all view in the admin didn’t respect the server-provided value of SCRIPT_NAME when redirecting unauthenticated users to the login page (#32754).

  • Fixed a bug in Django 3.2 where a system check would crash on an abstract model (#32733).

  • Prevented unnecessary initialization of unused caches following a regression in Django 3.2 (#32747).

  • Fixed a crash in Django 3.2 that could occur when running mod_wsgi with the recommended settings while the Windows colorama library was installed (#32740).

  • Fixed a bug in Django 3.2 that would trigger the auto-reloader for template changes when directory paths were specified with strings (#32744).

  • Fixed a regression in Django 3.2 that caused a crash of auto-reloader with AttributeError, e.g. inside a Conda environment (#32783).

  • Fixed a regression in Django 3.2 that caused a loss of precision for operations with DecimalField on MySQL (#32793).

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