CVE-2018-25089

A vulnerability was found in glb Meetup Tag Extension 0.1 on MediaWiki. It has been rated as problematic. This issue affects some unknown processing of the component Link Attribute Handler. The manipulation leads to use of web link to untrusted target with window.opener access. Upgrading to version 0.2 is able to address this issue. The identifier of the patch is 850c726d6bbfe0bf270801fbb92a30babea4155c. It is recommended to upgrade the affected component. The identifier VDB-238157 was assigned to this vulnerability.

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://github.com/glb/mediawiki-tag-extension-meetup/commit/850c726d6bbfe0bf270801fbb92a30babea4155c
• https://github.com/glb/mediawiki-tag-extension-meetup/releases/tag/v0.2
• https://vuldb.com/?ctiid.238157
• https://vuldb.com/?id.238157
• https://github.com/glb/mediawiki-tag-extension-meetup/commit/850c726d6bbfe0bf270801fbb92a30babea4155c
• https://github.com/glb/mediawiki-tag-extension-meetup/releases/tag/v0.2
• https://vuldb.com/?ctiid.238157
• https://vuldb.com/?id.238157