Impact
Any user with the right to edit his personal page can follow one of the scenario below:
Scenario 1:
- Log in as a simple user with just edit rights on the user profile
- Go to the user's profile
- Upload an attachment in the attachment tab at the bottom of the page (any image is fine)
- Click on "rename" in the attachment list and enter
{{async async="true" cached="false" context="doc.reference"}}{{groovy}}println("Hello from groovy!"){{/groovy}}{{/async}}.png as new attachment name and submit the rename
- Go back to the user profile
- Click on the edit icon on the user avatar
Hello from groovy! is displayed as the title of the attachment
Scenario 2:
- Log in as a simple user with just edit rights on a page
- Create a Page
MyPage.WebHome
- Create an XClass field of type String named
avatar
- Add an XObject of type
MyPage.WebHome on the page
- Insert an
attachmentSelector macro in the document with the following values:
- classname:
MyPage.WebHome
- property:
avatar
- savemode:
direct
- displayImage:
true
- width:
]] {{async async="true" cached="false" context="doc.reference"}}{{groovy}}println("Hello from groovy!"){{/groovy}}{{/async}}. You'll find below a snippet of an attachmentSelector macro declaration.
- Display the page
- Use the attachment picker to select an image
Hello from groovy is displayed aside the image
Example of an attachmentSelector macro declaration:
`{{attachmentSelector classname="MyPage.WebHome" property="avatar" savemode="direct" displayImage="true" width="]] {{async async=~"true~" cached=~"false~" context=~"doc.reference~"~}~}{{groovy~}~}println(~"Hello from groovy!~"){{/groovy~}~}{{/async~}~}"/}}`
Note: The issue can also be reproduced by inserting the dangerous payload in the height or alt macro properties.
Patches
The issue can be fixed on a running wiki by updating XWiki.AttachmentSelector with the versions below:
Workarounds
No known workaround.
References
For more information
If you have any questions or comments about this advisory:
References
Impact
Any user with the right to edit his personal page can follow one of the scenario below:
Scenario 1:
{{async async="true" cached="false" context="doc.reference"}}{{groovy}}println("Hello from groovy!"){{/groovy}}{{/async}}.pngas new attachment name and submit the renameHello from groovy!is displayed as the title of the attachmentScenario 2:
MyPage.WebHomeavatarMyPage.WebHomeon the pageattachmentSelectormacro in the document with the following values:MyPage.WebHomeavatardirecttrue]] {{async async="true" cached="false" context="doc.reference"}}{{groovy}}println("Hello from groovy!"){{/groovy}}{{/async}}. You'll find below a snippet of anattachmentSelectormacro declaration.Hello from groovyis displayed aside the imageExample of an
attachmentSelectormacro declaration:Note: The issue can also be reproduced by inserting the dangerous payload in the
heightoraltmacro properties.Patches
The issue can be fixed on a running wiki by updating
XWiki.AttachmentSelectorwith the versions below:Workarounds
No known workaround.
References
For more information
If you have any questions or comments about this advisory:
References