CVE-2021-32732: Cross-Site Request Forgery in xwiki-platform
Impact It's possible to know if a user has or not an account in a wiki related to an email address, and which username(s) is actually tied to that email by forging a request to the Forgot username page. Note that since this page does not have a CSRF check it's quite easy to perform a lot of those requests. ### Patches This issue has been patched in XWiki 12.10.5 and 13.2RC1. Two different patches are provided: - a first one to fix the CSRF problem - a more complex one that now relies on sending an email for the Forgot username process. ### Workarounds It's possible to fix the problem without uprading by editing the ForgotUsername page in version below 13.x, to use the following code: https://github.com/xwiki/xwiki-platform/blob/69548c0320cbd772540cf4668743e69f879812cf/xwiki-platform-core/xwiki-platform-administration/xwiki-platform-administration-ui/src/main/resources/XWiki/ForgotUsername.xml#L39-L123 In version after 13.x it's also possible to edit manually the forgotusername.vm file, but it's really encouraged to upgrade the version here. ### References https://jira.xwiki.org/browse/XWIKI-18384 https://jira.xwiki.org/browse/XWIKI-18408 ### For more information If you have any questions or comments about this advisory: Open an issue in Jira XWiki Email us at security ML
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Frequently Asked Questions
What is the severity of CVE-2021-32732?
CVE-2021-32732 is considered a medium severity vulnerability.
How do I fix CVE-2021-32732?
To fix CVE-2021-32732, upgrade to XWiki versions 12.10.5, 13.0, or 13.1.
What is the impact of CVE-2021-32732?
CVE-2021-32732 allows attackers to ascertain the presence of user accounts tied to specific email addresses.
Which versions of XWiki are affected by CVE-2021-32732?
XWiki versions prior to 12.10.5 and specific versions 13.0 and 13.1 are affected by CVE-2021-32732.
Is there a CSRF check for the Forgot username page affected by CVE-2021-32732?
No, the Forgot username page affected by CVE-2021-32732 does not have a CSRF check.