CVE-2020-4071 Information

Description

In django-basic-auth-ip-whitelist before 0.3.4 a potential timing attack exists on websites where the basic authentication is used or configured i.e. BASIC_AUTH_LOGIN and BASIC_AUTH_PASSWORD is set. Currently the string comparison between configured credentials and the ones provided by users is performed through a character-by-character string comparison. This enables a possibility that attacker may time the time it takes the server to validate different usernames and password and use this knowledge to work out the valid credentials. This attack is understood not to be realistic over the Internet. However it may be achieved from within local networks where the website is hosted e.g. from inside a data centre where a website’s server is located. Sites protected by IP address whitelisting only are unaffected by this vulnerability. This vulnerability has been fixed on version 0.3.4 of django-basic-auth-ip-whitelist. Update to version 0.3.4 as soon as possible and change basic authentication username and password configured on a Django project using this package. A workaround without upgrading to version 0.3.4 is to stop using basic authentication and use the IP whitelisting component only. It can be achieved by not setting BASIC_AUTH_LOGIN and BASIC_AUTH_PASSWORD in Django project settings.

CVSS Vector

CVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Reference

https://github.com/tm-kn/django-basic-auth-ip-whitelist/security/advisories/GHSA-m38j-pmg3-v5x5 https://groups.google.com/forum/!msg/django-developers/iAaq0pvHXuA/fpUuwjK3i2wJ

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

NONE

Confidentiality Impact

UNCHANGED

Integrity Impact

LOW

Availability Impact

NONE

Base Score

NONE

Base Severity

2.4