Vulnerable Plugin Exploited in Spam Redirect Campaign

Some weeks ago a critical unauthenticated privilege escalation vulnerability was discovered in old, unpatched versions of the wp-user-avatar plugin. It also allows for arbitrary file uploads, which is where we have been seeing the infections start. This plugin has over 400,000 installations so we have seen a sustained campaign to infect sites with this plugin installed. In this post I will review a common infection seen as a result of this vulnerability in the wp-user-avatar plugin.

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