Duplicator WordPress Plugin Vulnerability Exploited in the Wild
Attackers are targeting a recently patched flaw in a popular WordPress plugin with over 1 million active installations.
Background
On February 12, Snap Creek, makers of the popular WordPress plugin Duplicator, released version 1.3.28 and Duplicator Pro version 3.8.7.1 to address a serious vulnerability.
Duplicator is a plugin used by WordPress site administrators to “migrate and copy WordPress sites.” According to statistics from WordPress.org, Duplicator has over 1 million active installations, and according to Snap Creek, it has been downloaded over 15 million times.
Analysis
According to researchers at Wordfence, an unauthenticated arbitrary file download vulnerability exists in Duplicator versions 1.3.26 and below and Duplicator Pro versions 3.8.7 and below.
The vulnerability exists due to the implementation of a pair of functions, duplicator_download and duplicator_init. The functions can be accessed by unauthenticated users because they were implemented using the wp_ajax_nopriv_ hook. Researchers note that because the functions were “hooked into init,” they would be executed on every WordPress page that’s loaded, whether the user is logged in or not.
Within these functions, the file parameter was sanitized but not validated, so an attacker could use path traversal to access files outside of Duplicator’s specified path.
An unauthenticated, remote attacker could exploit this vulnerability by sending a specially crafted request to a WordPress site using the vulnerable version of the Duplicator plugin. This would allow them to download files outside of the intended directory. An attacker would need some knowledge of the target file structure or attempt to download commonly known files.
These files could include the wp-config.php file, referred to as “one of the most important files” in a WordPress installation. This is because the configuration file contains database credentials and authentication keys and salts. An attacker could use this information to create their own administrator account on the vulnerable site or “inject content or harvest data.”
Wordfence has reportedly blocked over 60,000 attempts to download the wp-config.php file using this vulnerability. They note that of the 60,000 attempts, 50,000 occurred before February 12, prior to Snap Creek releasing a fix for the vulnerability, indicating this was exploited in the wild as a zero-day.
Proof of concept
At the time this blog post was published, there was no proof of concept (PoC) available for this vulnerability. However, there is enough information available in Wordfence’s blog post along with the indicators of compromise to easily craft a PoC.
Solution
Snap Creek addressed this vulnerability in Duplicator version 1.3.28 and Duplicator Pro version 3.8.7.1 on February 12. Duplicator and Duplicator Pro users are strongly encouraged to upgrade to versions 1.3.28 and 3.8.7.1 or greater as soon as possible.
Wordfence provided indicators of compromise to identify attacks exploiting this vulnerability. The bulk of the attacks they’ve seen originate from the following IP address:
- 77.71.115.52
Additionally, review HTTP logs for requests that include the following query strings:
- action=duplicator_download
- file=/../wp-config.php
The most reliable indicator is whether the request contains the file parameter, as that is required to exploit this vulnerability.
Identifying affected systems
A list of Tenable plugins to identify this vulnerability will appear here as they’re released.
Get more information
Join Tenable's Security Response Team on the Tenable Community.
Learn more about Tenable, the first Cyber Exposure platform for holistic management of your modern attack surface.
Get a free 30-day trial of Tenable.io Vulnerability Management.
Related Articles
CVE-2024-21793, CVE-2024-26026: Proof of Concept Available for F5 BIG-IP Next Central Manager Vulnerabilities
May 9, 2024Researchers disclose multiple vulnerabilities in F5 BIG-IP Next Central Manager and provide proof-of-concept exploit code, which could lead to exposure of hashed passwords.
Cybersecurity Snapshot: Attackers Pounce on Unpatched Vulns, DBIR Says, as Critical Infrastructure Orgs Benefit from CISA’s Alert Program
May 3, 2024Verizon’s DBIR found that hackers are having a field day exploiting vulnerabilities to gain initial access. Plus, a CISA program is helping critical infrastructure organizations prevent ransomware attacks. In addition, check out what Tenable’s got planned for RSA Conference 2024. And get the latest on the Change Healthcare breach. And much more!
CVE-2024-20353, CVE-2024-20359: Frequently Asked Questions About ArcaneDoor
April 25, 2024Frequently asked questions about CVE-2024-20353 and CVE-2024-20359, two vulnerabilities associated with “ArcaneDoor,” the espionage-related campaign targeting Cisco Adaptive Security Appliances.
Cybersecurity Snapshot: New Guide Explains How To Assess If Software Is Secure by Design, While NIST Publishes GenAI Risk Framework
May 10, 2024Is the software your company wants to buy securely designed? A new guide outlines how you can find out. Meanwhile, a new NIST framework can help you assess your GenAI systems’ risks. Plus, a survey shows a big disconnect between AI usage (high) and AI governance (low). And MITRE’s breach post-mortem brims with insights and actionable tips. And much more!
CVE-2024-21793, CVE-2024-26026: Proof of Concept Available for F5 BIG-IP Next Central Manager Vulnerabilities
May 9, 2024Researchers disclose multiple vulnerabilities in F5 BIG-IP Next Central Manager and provide proof-of-concept exploit code, which could lead to exposure of hashed passwords.
Cybersecurity Snapshot: Attackers Pounce on Unpatched Vulns, DBIR Says, as Critical Infrastructure Orgs Benefit from CISA’s Alert Program
May 3, 2024Verizon’s DBIR found that hackers are having a field day exploiting vulnerabilities to gain initial access. Plus, a CISA program is helping critical infrastructure organizations prevent ransomware attacks. In addition, check out what Tenable’s got planned for RSA Conference 2024. And get the latest on the Change Healthcare breach. And much more!
- Vulnerability Management