Site owners may also want to consider installing a website firewall, many of which would have prevented the backdoor from working. Anyone running a WordPress site with this company's offerings should carefully inspect their systems to ensure they're not running a backdoored instance.
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He wrote, " it seems that the malware that we've found associated with this backdoor is more of the same: spam, and redirects to malware and scam sites." The Jetpack post provides full names and versions of the infected AccessPress software. He said his best guess is that the people behind the backdoor were selling access to infected sites to people pushing web spam and malware. Some of the infected websites had spam payloads dating back nearly three years. Martin, however, said evidence suggests the backdoor itself is much older than that. The Jetpack post said evidence indicates that the supply chain attack on AccessPress Themes was performed in September.
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"Users who used software obtained directly from the AccessPress website unknowingly provided attackers with backdoor access, resulting in an unknown number of compromised websites," Ben Martin, a researcher with Web security firm Sucuri, wrote in a separate analysis of the backdoor. The same themes and plugins mirrored on, the official developer site for the WordPress project, remained clean.
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The affected software was available by download directly from the AccessPress Themes site. In a post published Thursday, Jetpack researcher Harald Eilertsen said timestamps and other evidence suggested the backdoors were introduced intentionally in a coordinated action after the themes and plugins were released. In all, Jetpack found that 40 AccessPress themes and 53 plugins were affected.
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The backdoor was discovered by security researchers from JetPack, the maker of security software owned by Automatic, provider of the hosting service and a major contributor to the development of WordPress. The backdoor gave the attackers full administrative control of websites that used at least 93 WordPress plugins and themes downloaded from AccessPress Themes. The backdoor has been found on "quite a few" sites running the open source content management system.
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An anonymous reader quotes a report from Ars Technica: Dozens of legitimate WordPress add-ons downloaded from their original sources have been found backdoored through a supply chain attack, researchers said.