Django 1.11.11 リリースノート

2018年3月6日

Django 1.11.11 では、1.11.10 にあった2つのセキュリティの問題を修正しました。

CVE-2018-7536: urlizeurlizetrunc テンプレートフィルタにおける DoS 攻撃の可能性

The django.utils.html.urlize() function was extremely slow to evaluate certain inputs due to catastrophic backtracking vulnerabilities in two regular expressions. The urlize() function is used to implement the urlize and urlizetrunc template filters, which were thus vulnerable.

The problematic regular expressions are replaced with parsing logic that behaves similarly.

CVE-2018-7537: Denial-of-service possibility in truncatechars_html and truncatewords_html template filters

If django.utils.text.Truncator's chars() and words() methods were passed the html=True argument, they were extremely slow to evaluate certain inputs due to a catastrophic backtracking vulnerability in a regular expression. The chars() and words() methods are used to implement the truncatechars_html and truncatewords_html template filters, which were thus vulnerable.

The backtracking problem in the regular expression is fixed.