CVE-2023-46731

XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. XWiki doesn't properly escape the section URL parameter that is used in the code for displaying administration sections. This allows any user with read access to the document `XWiki.AdminSheet` (by default, everyone including unauthenticated users) to execute code including Groovy code. This impacts the confidentiality, integrity and availability of the whole XWiki instance. This vulnerability has been patched in XWiki 14.10.14, 15.6 RC1 and 15.5.1. Users are advised to upgrade. Users unablr to upgrade may apply the fix in commit `fec8e0e53f9` manually. Alternatively, to protect against attacks from unauthenticated users, view right for guests can be removed from this document (it is only needed for space and wiki admins).

XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. XWiki doesn't properly escape the section URL parameter that is used in the code for displaying administration sections. This allows any user with read access to the document `XWiki.AdminSheet` (by default, everyone including unauthenticated users) to execute code including Groovy code. This impacts the confidentiality, integrity and availability of the whole XWiki instance. This vulnerability has been patched in XWiki 14.10.14, 15.6 RC1 and 15.5.1. Users are advised to upgrade. Users unablr to upgrade may apply the fix in commit `fec8e0e53f9` manually. Alternatively, to protect against attacks from unauthenticated users, view right for guests can be removed from this document (it is only needed for space and wiki admins).

### Impact XWiki doesn't properly escape the section URL parameter that is used in the code for displaying administration sections. This allows any user with read access to the document `XWiki.AdminSheet` (by default, everyone including unauthenticated users) to execute code including Groovy code. This impacts the confidentiality, integrity and availability of the whole XWiki instance. By opening the URL `<server>/xwiki/bin/get/Main/WebHome?sheet=XWiki.AdminSheet&viewer=content&section=%5D%5D%7B%7B%2Fhtml%7D%7D%7B%7Basync%7D%7D%7B%7Bgroovy%7D%7Dservices.logging.getLogger(%22attacker%22).error(%22Attack%20succeeded!%22)%7B%7B%2Fgroovy%7D%7D%7B%7B%2Fasync%7D%7D&xpage=view` where `<server>` is the URL of the XWiki installation, it can be tested if an XWiki installation is vulnerable. If this causes a log message `ERROR attacker - Attack succeeded!` to appear in XWiki's log, the installation is vulnerable. In very old versions of XWiki, the attack can be demonstrated with `<server>/xwiki/bin/get/XWiki/XWikiPreferences?section=%3C%25println(%22Hello%20from%20Groovy%22)%25%3E&xpage=view` which displays `admin.hello from groovy` as title when the attack succeeds (tested on XWiki 1.7). ### Patches This vulnerability has been patched in XWiki 14.10.14, 15.6 RC1 and 15.5.1. ### Workarounds The [fix](https://github.com/xwiki/xwiki-platform/commit/fec8e0e53f9fa2c3f1e568cc15b0e972727c803a#diff-6271f9be501f30b2ba55459eb451aee3413d34171ba8198a77c865306d174e23), which consists of replacing `= $services.localization.render("administration.sectionTitle$level", [$sectionName]) =` by `= $services.localization.render("administration.sectionTitle$level", 'xwiki/2.1', [$sectionName]) =`, can be applied manually to the document `XWiki.AdminSheet`. ### References * https://jira.xwiki.org/browse/XWIKI-21110 * https://github.com/xwiki/xwiki-platform/commit/fec8e0e53f9fa2c3f1e568cc15b0e972727c803a

### Impact XWiki doesn't properly escape the section URL parameter that is used in the code for displaying administration sections. This allows any user with read access to the document `XWiki.AdminSheet` (by default, everyone including unauthenticated users) to execute code including Groovy code. This impacts the confidentiality, integrity and availability of the whole XWiki instance. By opening the URL `<server>/xwiki/bin/get/Main/WebHome?sheet=XWiki.AdminSheet&viewer=content&section=%5D%5D%7B%7B%2Fhtml%7D%7D%7B%7Basync%7D%7D%7B%7Bgroovy%7D%7Dservices.logging.getLogger(%22attacker%22).error(%22Attack%20succeeded!%22)%7B%7B%2Fgroovy%7D%7D%7B%7B%2Fasync%7D%7D&xpage=view` where `<server>` is the URL of the XWiki installation, it can be tested if an XWiki installation is vulnerable. If this causes a log message `ERROR attacker - Attack succeeded!` to appear in XWiki's log, the installation is vulnerable. In very old versions of XWiki, the attack can be demonstrated with `<server>/xwiki/bin/get/XWiki/XWikiPreferences?section=%3C%25println(%22Hello%20from%20Groovy%22)%25%3E&xpage=view` which displays `admin.hello from groovy` as title when the attack succeeds (tested on XWiki 1.7). ### Patches This vulnerability has been patched in XWiki 14.10.14, 15.6 RC1 and 15.5.1. ### Workarounds The [fix](https://github.com/xwiki/xwiki-platform/commit/fec8e0e53f9fa2c3f1e568cc15b0e972727c803a#diff-6271f9be501f30b2ba55459eb451aee3413d34171ba8198a77c865306d174e23), which consists of replacing `= $services.localization.render("administration.sectionTitle$level", [$sectionName]) =` by `= $services.localization.render("administration.sectionTitle$level", 'xwiki/2.1', [$sectionName]) =`, can be applied manually to the document `XWiki.AdminSheet`. ### References * https://jira.xwiki.org/browse/XWIKI-21110 * https://github.com/xwiki/xwiki-platform/commit/fec8e0e53f9fa2c3f1e568cc15b0e972727c803a

XWiki Platform es una plataforma wiki genérica que ofrece servicios de ejecución para aplicaciones creadas sobre ella. XWiki no escapa correctamente al parámetro URL de la sección que se utiliza en el código para mostrar las secciones de administración. Esto permite que cualquier usuario con acceso de lectura al documento `XWiki.AdminSheet` (de forma predeterminada, todos, incluidos los usuarios no autenticados) ejecute código, incluido el código Groovy. Esto afecta la confidencialidad, integridad y disponibilidad de toda la instancia de XWiki. Esta vulnerabilidad ha sido parcheada en XWiki 14.10.14, 15.6 RC1 y 15.5.1. Se recomienda a los usuarios que actualicen. Los usuarios que no puedan actualizar pueden aplicar la solución en el commit `fec8e0e53f9` manualmente. Alternativamente, para protegerse contra ataques de usuarios no autenticados, se puede eliminar de este documento el derecho de visualización para invitados (solo es necesario para los administradores de espacio y wiki).