CVE-2021-39112

Affected versions of Atlassian Jira Server and Data Center allow remote attackers to redirect users to a malicious URL via a reverse tabnapping vulnerability in the Project Shortcuts feature. The affected versions are before version 8.5.15, from version 8.6.0 before 8.13.7, from version 8.14.0 before 8.17.1, and from version 8.18.0 before 8.18.1.

Weakness

The web application produces links to untrusted external sites outside of its sphere of control, but it does not properly prevent the external site from modifying security-critical properties of the window.opener object, such as the location property.

Affected Software

Potential Mitigations

• When creating a link to an external document using the tag with a defined target, for example “_blank” or a named frame, provide the rel attribute with a value “noopener noreferrer”.
• If opening the external document in a new window via javascript, then reset the opener by setting it equal to null.
• Do not use “_blank” targets. However, this can affect the usability of the application.

References

• https://jira.atlassian.com/browse/JRASERVER-72433
• https://jira.atlassian.com/browse/JRASERVER-72433