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Unpatched WPBakery WordPress Plugin Vulnerability More and more Focused in Assaults

By Ionut Arghire on July 18, 2022

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The Wordfence group at WordPress safety firm Defiant warns of a rise in assaults focusing on an unpatched vulnerability within the Kaswara addon for the WPBakery Web page Builder WordPress plugin.

Tracked as CVE-2021-24284 (CVSS rating of 10) and disclosed in April 2021, the critical-severity safety bug permits an unauthenticated attacker to add malicious PHP recordsdata to a susceptible web site, probably reaching distant code execution.

In response to Wordfence, an attacker can exploit the flaw to inject malicious JavaScript code into any file on the WordPress set up and utterly take over a susceptible web site.

When found, the flaw was being actively exploited, and Wordfence warned WordPress web site directors that the plugin had been closed and not using a patch, urging them to take away it instantly.

Though greater than a 12 months has handed because the zero-day was disclosed, between 4,000 and eight,000 websites proceed to make use of the plugin, which exposes them to malicious assaults.

Over the previous two weeks, Wordfence has seen an enormous surge within the variety of assault makes an attempt focusing on the vulnerability, at a mean of 440,000 per day. The assaults come from 10,215 attacking IP addresses, with 5 IP addresses being accountable for almost all of assaults.

The attackers, Wordfence explains, are probing greater than 1,5 million WordPress websites for the susceptible plugin, however the overwhelming majority of them aren’t impacted, provided that they don’t use the plugin.

“Nearly all of the assaults we’ve got seen are sending a POST request to /wp-admin/admin-ajax.php utilizing the uploadFontIcon AJAX motion discovered within the plugin to add a file to the impacted web site. Your logs could present the next question string on these occasions: /wp-admin/admin-ajax.php?motion=uploadFontIcon HTTP/1.1,” Wordfence says.

A lot of the assaults try to add a .ZIP archive containing a malicious PHP file that’s extracted to the /wp-content/uploads/kaswara/icons/ listing, and which permits the attackers to deploy extra payloads.

Wordfence has observed using the NDSW trojan in a few of these assaults. The trojan can inject code into authentic JavaScript recordsdata and can be utilized to redirect customers to malicious domains.

“Right now the plugin has been closed, and the developer has not been responsive relating to a patch. The most suitable choice is to totally take away the Kaswara Trendy WPBakery Web page Builder Addons plugin out of your WordPress web site,” Wordfence notes.

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