Yesterday, Sucuri published a very detailed document about a critical vulnerability in the Slider Revolution plugin. This is a vulnerability that’s about as bad as they can get. It allows access to files like wp-config.php and makes it fairly easy to compromise a website.
This wouldn’t be so bad if it wasn’t the case where the plugin author decided to not disclose the vulnerability and patch it without notifying their users:
The problem was fixed 29 updates back in 4.2 in February. We were told not to make the exploit public by several security companies so that the instructions of how to hack the slider will not appear on the web.
Right now, the exploit is being actively exploited and lots of websites are compromised because of it. But it gets worse. This plugin is bundled in a ton of themes sold on the internet, including some very popular themes on ThemeForest and other marketplaces. All of those sites are probably vulnerable to this exploit and can be compromised within seconds.
The good news is, there is a patch available. Users of the plugin can just update and the vulnerability will go away and their website will be safe again. There is only one problem. The themes that come with this plugin bundled, probably have no idea this vulnerability even exists and more important: They have no easy way to update the plugin. Yikes. Continue reading This is why you don’t bundle plugins in WordPress themes