CVE-2021-43841: XSS by SVG upload in xwiki-platform
First published: Fri Feb 04 2022(Updated: )
### Impact When using default XWiki configuration, it's possible for an attacker to upload an SVG containing a script executed when executing the download action on the file. ### Patches This problem has been patched so that the default configuration doesn't allow to display the SVG files in the browser. ### Workarounds This issue can be fixed without the patch by setting properly the configuration to download or display files, see: https://www.xwiki.org/xwiki/bin/view/Documentation/AdminGuide/Attachments#HAttachmentdisplayordownload ### References https://jira.xwiki.org/browse/XWIKI-18368 ### For more information If you have any questions or comments about this advisory: * Open an issue in [Jira](http://jira.xwiki.org) * Email us at [security ML](mailto:security@xwiki.org)
Credit: security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| maven/org.xwiki.platform:xwiki-platform-tool-configuration-resources | <12.10.6 | 12.10.6 |
| maven/org.xwiki.platform:xwiki-platform-tool-configuration-resources | >=13.0<=13.2 | 13.3RC1 |
| maven/org.xwiki.platform:xwiki-platform-oldcore | >=13.0<=13.2 | 13.3RC1 |
| maven/org.xwiki.platform:xwiki-platform-oldcore | <12.10.6 | 12.10.6 |
| Xwiki | >=1.0<12.10.6 | |
| Xwiki | >=13.0<=13.2 |
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Reference Links
- https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-9jq9-c2cv-pcrj
- https://nvd.nist.gov/vuln/detail/CVE-2021-43841
- https://github.com/xwiki/xwiki-platform/commit/5853d492b3a274db0d94d560e2a5ea988a271c62
- https://jira.xwiki.org/browse/XWIKI-18368
- https://www.xwiki.org/xwiki/bin/view/Documentation/AdminGuide/Attachments#HAttachmentdisplayordownload
- https://github.com/advisories/GHSA-9jq9-c2cv-pcrj (Advisory)
Frequently Asked Questions
What is the severity of CVE-2021-43841?
CVE-2021-43841 is categorized as a medium severity vulnerability due to its potential for script execution through uploaded SVG files.
How do I fix CVE-2021-43841?
To mitigate CVE-2021-43841, upgrade to the patched versions 12.10.6 or 13.3RC1 of the affected XWiki packages.
What products are affected by CVE-2021-43841?
CVE-2021-43841 affects XWiki versions prior to 12.10.6 and between 13.0 and 13.2.
What type of attack does CVE-2021-43841 enable?
CVE-2021-43841 enables attackers to upload malicious SVG files that can execute scripts upon file download.
Is there a workaround for CVE-2021-43841?
While upgrading is recommended, enforcing strict file type validations may serve as a temporary workaround for CVE-2021-43841.
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