Drupal 7.x SQL Injection CVE-2014-3704 — Active Exploitation Alert

The Cybersecurity and Infrastructure Security Agency (CISA) has updated its Known Exploited Vulnerabilities (KEV) catalog to include a legacy CVE affecting the Drupal content management system. According to BleepingComputer, federal agencies have been ordered to secure their environments against CVE-2014-3704, a high-severity SQL injection vulnerability originally disclosed in 2014.

This vulnerability, famously known as “Drupalgeddon,” resides in the Drupal 7.x database abstraction API. Specifically, it exists because the expandArguments function does not properly sanitize keys in specially crafted arrays. An unauthenticated attacker can leverage this flaw to send malicious requests to a vulnerable server, leading to Privilege Escalation, data exfiltration, or RCE through the manipulation of database queries.

Technical Analysis of CVE-2014-3704

The core of the issue lies in how Drupal 7 handles SQL queries with multiple arguments. The API was designed to expand arrays into a comma-separated list of placeholders. However, the system failed to check if the keys of the array were safe. By crafting a request where the array keys contain SQL fragments, an attacker can break out of the intended query structure. Because this occurs before authentication is verified, it represents a significant entry point for APT groups and opportunistic attackers.

While the vulnerability is a decade old, its re-emergence in CISA’s KEV catalog suggests that active exploitation of Drupalgeddon remains a viable TTP for threat actors targeting legacy infrastructure. Many organizations continue to run Drupal 7 due to the complexities involved in migrating to newer versions like Drupal 10. This persistence of legacy software creates a broad attack surface for actors looking to establish a C2 presence within government or corporate networks.

Detecting and Analyzing Active Exploitation of Drupalgeddon

For SOC teams and incident responders, knowing how to detect CVE-2014-3704 exploit attempts is vital for maintaining network integrity. Defenders should scrutinize web server logs for POST requests directed at common Drupal entry points, such as index.php, where the payload includes unusual array structures or SQL keywords like SELECT, INSERT, or UPDATE in the request body parameters.

Advanced detection involves monitoring for unauthorized changes to the users table in the Drupal database. Attackers frequently use this vulnerability to create a new administrative user or reset the password of the primary administrator account (UID 1). If an EDR solution is deployed, it may flag suspicious PHP execution or outbound network connections originating from the web server process following a successful exploit.

Recommended Drupal 7.x SQL injection mitigation steps

The primary remediation for this threat is the immediate application of security patches. Organizations still running Drupal 7 should upgrade to version 7.32 or later. If a full upgrade is not immediately feasible due to legacy dependencies, administrators can apply the specific patch for the database.inc file provided by the Drupal security team.

In addition to patching, defenders should implement the following measures:

• Deploy Web Application Firewall (WAF) signatures specifically tuned to identify and block Drupalgeddon SQL injection patterns.
• Conduct a thorough audit of the database for any IoC, such as unexpected administrative accounts or modified configuration settings.
• Transition toward a Zero Trust architecture where web servers are isolated from sensitive internal resources, limiting the potential for Lateral Movement.

This CISA mandate serves as a reminder that vulnerabilities do not disappear simply because they are old. Threat actors will continue to leverage known flaws as long as vulnerable systems remain accessible on the public internet.