Calling wpmu_delete_blog with $blog_id delete all database tables

[mblanc]

When calling the wpmu_delete_blog function with a blog_id of 1, get_blog_prefix called by this function returns a dangerous (for the delete purpose) prefix (i.e. 'wp\_%', assuming the installation prefix was 'wp_').

Since tables returned by "SHOW TABLES LIKE 'wp\_%'" are deleted, all the Wordpress tables are destroyed.

Of course, the backoffice doesn't allow an admin to delete the blog 1, but it might be a safe idea to prevent this by checking that $blog_id passed to wpmu_delete_blog is never 0 or 1 since any plugin can call it with a wrong parameter.

Sounds like a good idea.

PS: We call the backoffice the admin area. ;)

Crude small fix actually running here

It take note for 'Admin area'. Too much SPIP probably ;)

Mind the vartype (%d is used later on)

Thanks for reporting the issue, patch added to ensure the vartype of $blog_id is integer while performing the same check as in wpmu_delete_blog.patch.

Older MU installs will have a wp_1_* prefix for blog ID 1. These patches would prevent deleting that blog even though it isn't dangerous. Probably not worth caring about, however.

fixed in [19038]