GHSA-7rfg-6273-f5wp

Source
https://github.com/advisories/GHSA-7rfg-6273-f5wp
Import Source
https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/11/GHSA-7rfg-6273-f5wp/GHSA-7rfg-6273-f5wp.json
Aliases
Published
2023-11-20T21:00:05Z
Modified
2023-11-20T21:27:09.358376Z
Details

Impact

The rendered diff in XWiki embeds images to be able to compare the contents and not display a difference for an actually unchanged image. For this, XWiki requests all embedded images on the server side. These requests are also sent for images from other domains and include all cookies that were sent in the original request to ensure that images with restricted view right can be compared. This allows an attacker to steal login and session cookies that allow impersonating the current user who views the diff. The attack can be triggered with an image that references the rendered diff, thus making it easy to trigger.

More concretely, to reproduce, add 101 different images with references to the attacker's server. In any place add an image with a reference to /xwiki/bin/view/Image%20Cookie%20Test/?xpage=changes&rev1=1.1&rev2=2.1&include=renderedChanges where Image%20Cookie%20Test needs to be replaced by the path to the document with the images and the two revisions should match the revision before/after adding the images. Whenever a user views that image, the user's login cookies should be sent to the attacker's server. The 101 images are to circumvent the cache that has a default maximum size of 100 entries.

Apart from stealing login cookies, this also allows server-side request forgery (the result of any successful request is returned in the image's source) and viewing protected content as once a resource is cached, it is returned for all users. As only successful requests are cached, the cache will be filled by the first user who is allowed to access the resource.

Patches

This has been patched in XWiki 14.10.15, 15.5.1 and 15.6. The rendered diff now only downloads images from trusted domains. Further, cookies are only sent when the image's domain is the same the requested domain. The cache has been changed to be specific for each user.

Workarounds

As a workaround, the image embedding feature can be disabled by deleting xwiki-platform-diff-xml-<version>.jar in WEB-INF/lib/.

References

  • https://jira.xwiki.org/browse/XWIKI-20818
  • https://github.com/xwiki/xwiki-platform/commit/bff0203e739b6e3eb90af5736f04278c73c2a8bb
References

Affected packages

Maven / org.xwiki.platform:xwiki-platform-diff-xml

Package

Name
org.xwiki.platform:xwiki-platform-diff-xml

Affected ranges

Type
ECOSYSTEM
Events
Introduced
11.10.1
Fixed
14.10.15

Maven / org.xwiki.platform:xwiki-platform-diff-xml

Package

Name
org.xwiki.platform:xwiki-platform-diff-xml

Affected ranges

Type
ECOSYSTEM
Events
Introduced
15.0-rc-1
Fixed
15.5.1

Maven / org.xwiki.platform:xwiki-platform-diff-xml

Package

Name
org.xwiki.platform:xwiki-platform-diff-xml

Affected ranges

Type
ECOSYSTEM
Events
Introduced
15.6-rc-1
Fixed
15.6