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Cross-Site Request Forgery occurrences in Jira Software Data Center
Atlassian Jira Server and Data Center in affected versions allows remote attackers to modify logging and profiling settings via a cross-site request forgery (CSRF) vulnerability. The affected versions are before version 7.13.3, and from version 8.0.0 before 8.1.0. (2020-06-30, CVE-2019-20415)
Why Cross-Site Request Forgery can be dangerous
The absence of Anti-CSRF tokens may lead to a Cross-Site Request Forgery attack that can result in executing a specific application action as another logged in user, e.g. steal their account by changing their email and password or silently adding a new admin user account when executed from the administrator account.
The attacker may copy one of your web application forms, e.g. email/password change form.
The webpage will contain a form with the exact set of fields as the original application but with input values already provided and the submit button replaced with a Javascript code causing auto-submission. When the page is accessed the form will be immediately submitted and page contents replaced with a valid content or a redirect to your original application.
One of your application users who is already logged in can be then tricked to navigate to such malicious page e.g. by clicking a link in a phishing email, and the pre-populated form content will be submitted to your application like it would be submitted by your user.