Arch Linux Security Advisory ASA-201803-6 ========================================= Severity: Medium Date : 2018-03-06 CVE-ID : CVE-2018-7536 CVE-2018-7537 Package : python2-django Type : denial of service Remote : Yes Link : https://security.archlinux.org/AVG-649 Summary ======= The package python2-django before version 1.11.11-1 is vulnerable to denial of service. Resolution ========== Upgrade to 1.11.11-1. # pacman -Syu "python2-django>=1.11.11-1" The problems have been fixed upstream in version 1.11.11. Workaround ========== None. Description =========== - CVE-2018-7536 (denial of service) 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) 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. Impact ====== A remote attacker is able to crash the application by providing specially crafted input. References ========== https://docs.djangoproject.com/en/dev/releases/1.11.11/ https://github.com/django/django/commit/8618271caa0b09daba39ff3b46567d33ae1e... https://github.com/django/django/commit/97b7dd59bb8d6163239061e2022153c3415d... https://security.archlinux.org/CVE-2018-7536 https://security.archlinux.org/CVE-2018-7537