CVE-2020-15225High· 7.5▾ TwilightPotential DoS with NumberFilter conversion to integer values.
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 41.3 · likelihood 0.4 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
Last analysed / modified upstream
1.8%
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.
If you have any questions or comments about this advisory:
Thanks to Marcin Waraksa for the report.
django-filter < 2.4.0Upgrade to a patched release:
django-filter 2.4.0