Arch Linux Security Advisory ASA-202106-41
==========================================

Severity: Medium
Date    : 2021-06-15
CVE-ID  : CVE-2021-33203 CVE-2021-33571
Package : python-django
Type    : multiple issues
Remote  : Yes
Link    : https://security.archlinux.org/AVG-2026

Summary
=======

The package python-django before version 3.2.4-1 is vulnerable to
multiple issues including insufficient validation and directory
traversal.

Resolution
==========

Upgrade to 3.2.4-1.

# pacman -Syu "python-django>=3.2.4-1"

The problems have been fixed upstream in version 3.2.4.

Workaround
==========

None.

Description
===========

- CVE-2021-33203 (directory traversal)

A security issue has been found in Django before version 3.2.4. 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.

- CVE-2021-33571 (insufficient validation)

A security issue has been found in Django before version 3.2.4.
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+.

Impact
======

User accounts with staff privileges could check for the existence of
arbitrary files, and possibly disclose their contents. Additionally,
leading zeros in IPv4 addresses could be used to bypass IP-based access
restrictions.

References
==========

https://www.djangoproject.com/weblog/2021/jun/02/security-releases/#s-cve-2021-33203-potential-directory-traversal-via-admindocs
https://github.com/django/django/commit/dfaba12cda060b8b292ae1d271b44bf810b1c5b9
https://www.djangoproject.com/weblog/2021/jun/02/security-releases/#s-cve-2021-33571-possible-indeterminate-ssrf-rfi-and-lfi-attacks-since-validators-accepted-leading-zeros-in-ipv4-addresses
https://github.com/django/django/commit/9f75e2e562fa0c0482f3dde6fc7399a9070b4a3d
https://security.archlinux.org/CVE-2021-33203
https://security.archlinux.org/CVE-2021-33571