Facebook for WordPress Plugin Vulnerability Targets +500,000 Sites

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Two vulnerabilities have been patched within the Facebook for WordPress Plugin. The exploits might permit a malicious attacker to put in backdoors, create administrator stage accounts and stage a whole web site takeover.

Facebook for WordPress Exploit

Facebook for WordPress plugin, put in in over 500,000 web sites, is a web site customer monitoring plugin for advertisers that use Facebook advertisements. It permits advertisers to trace the customer journey and optimize their advert campaigns.

One of the exploits was found in December 2020. The different flaw was launched in January 2021 as a part of a rebranding and code replace to the plugin.


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PHP Object Injection Vulnerability

This sort of exploit will depend on a flaw that inadequately sanitizes uploads which in flip permits an attacker to carry out quite a lot of assaults similar to code injection.

In this particular assault a hacker might use the compromised plugin to add a file and proceed to a distant code execution.

The particulars of this vulnerability might additionally permit the attacker to make the most of different plugins containing the vulnerability.

According to Wordfence:

“This meant that an attacker might generate a PHP file new.php in a weak web site’s house listing… The PHP file contents could possibly be modified to something… which might permit an attacker to realize distant code execution.

Note that the presence of a full POP chain additionally meant that some other plugin with an object injection vulnerability, together with those who didn’t require information of the positioning’s salts and keys, might doubtlessly be used to realize distant code execution as effectively if it was put in on a web site with the Facebook for WordPress plugin.”


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Cross-Site Request Forgery

A cross web site request forgery exploit is a sort that requires a sufferer with administrator stage credentials to a WordPress web site to carry out an motion (like click on on a hyperlink) which might then result in an assault that takes benefit of the directors excessive stage credentials.

An attacker might achieve entry to non-public metric knowledge or stage a whole web site takeover.

Wordfence describes it like this:

“The motion could possibly be utilized by an attacker to replace the plugin’s settings to level to their very own Facebook Pixel console and steal metric knowledge for a web site.

Worse but, since there was no sanitization on the settings that have been saved, an attacker might inject malicious JavaScript into the setting values.

These values would then be mirrored on the settings web page, inflicting the code to execute in a web site administrator’s browser whereas accessing the settings web page.

Ultimately, this code could possibly be used to inject malicious backdoors into theme recordsdata or create new administrative person accounts that could possibly be used for full web site takeover.”

Update Recommended

It is beneficial that every one customers instantly replace their plugin to the most recent model (presently Version three.zero.5). Facebook for WordPress model three.zero.four is totally patched however model three.zero.5 is the freshest model of the plugin.


Two Vulnerabilities Patched in Facebook for WordPress Plugin

Facebook for WordPress Changelog

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