GHSA-r28v-mw67-m5p9

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GHSA-r28v-mw67-m5p9

Summary: Django denial-of-service possibility in urlize and urlizetrunc template filters

Details: An issue was discovered in Django 2.0 before 2.0.3, 1.11 before 1.11.11, and 1.8 before 1.8.19. The `django.utils.html.urlize()` function was extremely slow to evaluate certain inputs due to catastrophic backtracking vulnerabilities in two regular expressions (only one regular expression for Django 1.8.x). The `urlize()` function is used to implement the urlize and urlizetrunc template filters, which were thus vulnerable.

References: https://nvd.nist.gov/vuln/detail/CVE-2018-7536, https://github.com/django/django/commit/1ca63a66ef3163149ad822701273e8a1844192c2, https://github.com/django/django/commit/abf89d729f210c692a50e0ad3f75fb6bec6fae16, https://github.com/django/django/commit/e157315da3ae7005fa0683ffc9751dbeca7306c8, https://access.redhat.com/errata/RHSA-2018:2927, https://access.redhat.com/errata/RHSA-2019:0051, https://access.redhat.com/errata/RHSA-2019:0082, https://access.redhat.com/errata/RHSA-2019:0265, https://github.com/advisories/GHSA-r28v-mw67-m5p9, https://github.com/django/django, https://github.com/pypa/advisory-database/tree/main/vulns/django/PYSEC-2018-5.yaml, https://lists.debian.org/debian-lts-announce/2018/03/msg00006.html, https://usn.ubuntu.com/3591-1, https://web.archive.org/web/20200227131019/http://www.securityfocus.com/bid/103361, https://www.debian.org/security/2018/dsa-4161, https://www.djangoproject.com/weblog/2018/mar/06/security-releases