Bug 1955772 (CVE-2020-15225) - CVE-2020-15225 python-django-filter: Maliciously input using exponential format may cause denial of service
Summary: CVE-2020-15225 python-django-filter: Maliciously input using exponential form...
Keywords:
Status: NEW
Alias: CVE-2020-15225
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
low
low
Target Milestone: ---
Assignee: Red Hat Product Security
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Depends On: 1955773 1955774 1959831
Blocks: 1955775
TreeView+ depends on / blocked
 
Reported: 2021-04-30 18:35 UTC by Pedro Sampaio
Modified: 2021-05-12 13:02 UTC (History)
30 users (show)

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Description Pedro Sampaio 2021-04-30 18:35:34 UTC
django-filter is a generic system for filtering Django QuerySets based on user selections. In django-filter before version 2.4.0, automatically generated `NumberFilter` instances, whose value was later converted to an integer, were subject to potential DoS from maliciously input using exponential format with sufficiently large exponents. Version 2.4.0+ applies a `MaxValueValidator` with a a default `limit_value` of 1e50 to the form field used by `NumberFilter` instances. In addition, `NumberFilter` implements the new `get_max_validator()` which should return a configured validator instance to customise the limit, or else `None` to disable the additional validation. Users may manually apply an equivalent validator if they are not able to upgrade.

References:

https://github.com/carltongibson/django-filter/security/advisories/GHSA-x7gm-rfgv-w973
https://github.com/carltongibson/django-filter/commit/340cf7a23a2b3dcd7183f6a0d6c383e85b130d2b
https://pypi.org/project/django-filter/
https://github.com/carltongibson/django-filter/releases/tag/2.4.0

Comment 1 Pedro Sampaio 2021-04-30 18:36:20 UTC
Created python-django-filter tracking bugs for this issue:

Affects: epel-all [bug 1955774]
Affects: fedora-all [bug 1955773]


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