In a concerning development for website owners and administrators, hackers have been exploiting a vulnerability in the popular Popup Builder plugin for WordPress, resulting in the infection of over 3,300 websites worldwide. This security flaw, officially tracked as CVE-2023-6000, allows malicious actors to execute cross-site scripting (XSS) attacks on websites that are using outdated versions of the Popup Builder plugin, specifically versions 4.2.3 and older.
The vulnerability was initially disclosed in November 2023, raising alarm bells in the cybersecurity community. Despite this disclosure, many site administrators failed to promptly update their systems, leaving them vulnerable to exploitation by hackers. Now, the consequences of this oversight are becoming apparent, with Sucuri, a prominent cybersecurity firm, reporting a recent surge in attacks targeting WordPress sites through this vulnerability.
At the core of the exploit is the injection of malicious code into the Custom JavaScript or Custom CSS sections of the WordPress admin interface. This injected code is then stored within the 'wp_postmeta' database table, allowing hackers to manipulate the behavior of the Popup Builder plugin. By leveraging event handlers within the plugin, such as popup open or close events, hackers can execute various malicious actions, including redirecting unsuspecting visitors to phishing pages or malware-dropping sites.
Sucuri's analysis has revealed that the attacks originate from domains such as "ttincoming.traveltraffic[.]cc" and "host.cloudsonicwave[.]com."
As a proactive measure, site owners are advised to block access to these domains to mitigate the risk of infection. However, blocking domains alone may not be sufficient to fully protect websites from exploitation.
To effectively safeguard against this threat, website owners must update to the latest version of the Popup Builder plugin, currently version 4.2.7.
This updated version addresses CVE-2023-6000 and other security vulnerabilities, providing enhanced protection against malicious attacks. Despite the availability of patches, WordPress statistics indicate that a significant number of active sites continue to use outdated versions of the plugin, leaving them vulnerable to exploitation.
In the unfortunate event of a website being infected, swift action is necessary to mitigate further damage. Site administrators should immediately remove any malicious entries injected into the Popup Builder's custom sections and conduct thorough scans to detect and eliminate any hidden backdoors that could facilitate reinfection.
The prevalence of this vulnerability underscores the importance of maintaining robust cybersecurity practices for WordPress sites.
By staying vigilant, promptly applying software updates, and implementing proactive security measures, website owners can better protect their sites and mitigate the risk of falling victim to malicious attacks. As the threat landscape continues to evolve, proactive security measures are essential to safeguarding the integrity and security of WordPress websites.
