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GHSA-9hqh-fmhg-vq2j

CriticalCVSS 9.9 / 10
Published Nov 21, 2022·Last modified Nov 8, 2023
Affected Components(0)

No affected components available

Description

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:

  • 14.5-rc-1+: https://github.com/xwiki/xwiki-platform/commit/eb15147adf94bddb92626f862c1710d45bcd64a7#diff-e1513599ab698991f6cbba55d38f3f464432ced8d137a668b1f7618c7e747e23
  • 14.4.2+: https://github.com/xwiki/xwiki-platform/commit/c02f8eb1f3c953d124f2c097021536f8bc00fa8d#diff-e1513599ab698991f6cbba55d38f3f464432ced8d137a668b1f7618c7e747e23
  • 13.10.7+: https://github.com/xwiki/xwiki-platform/commit/efd0df0468d46149ba68b66660b93f31b6318515#diff-e1513599ab698991f6cbba55d38f3f464432ced8d137a668b1f7618c7e747e23

Workarounds

No known workaround.

References

  • https://jira.xwiki.org/browse/XWIKI-19800

For more information

If you have any questions or comments about this advisory:

Risk Scores
Base Score
9.9

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker needs basic access or low-level privileges. No user interaction is needed for the attacker to exploit this vulnerability. The vulnerability can affect other systems as well, not just the initial system. There is a high impact on the confidentiality of the information. There is a high impact on the integrity of the data. There is a high impact on the availability of the system.

Threat Intelligence
9.1

Active exploitation in the wild has been confirmed. Immediate patching or mitigation is required.

EPSS
0.98%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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Critical severity
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