Advisory Weakness Curation

XWiki Platform vulnerable to remote code execution through the section parameter in Administration as guest ### 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

Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection') XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. XWiki does not 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).

Improper Neutralization of Directives in Dynamically Evaluated Code ('Eval Injection') XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. XWiki does not 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).