Attack Chain

1. The attacker gains initial access to the Joomla application, potentially through compromised credentials or social engineering.
2. The attacker exploits an SQL Injection vulnerability to manipulate database queries.
3. Using SQL injection, the attacker extracts sensitive information, such as user credentials or configuration details.
4. The attacker escalates privileges by exploiting a vulnerability in Joomla’s access control mechanisms.
5. With elevated privileges, the attacker injects malicious JavaScript code into a Joomla page via an XSS vulnerability.
6. When other users visit the compromised page, the injected JavaScript executes in their browsers, potentially stealing cookies or redirecting them to phishing sites.
7. The attacker exploits a Path Traversal vulnerability to access files and directories outside the intended web root.
8. The attacker leverages a Local File Inclusion (LFI) vulnerability to execute arbitrary code on the server.

Impact

Successful exploitation of these vulnerabilities can lead to a range of damaging consequences. An attacker can gain complete control over the Joomla installation, allowing them to modify website content, steal sensitive data, or use the server as a platform for launching further attacks. The impact includes data breaches, website defacement, malware distribution, and potential compromise of other systems on the network. The number of victims and specific sectors targeted are currently unknown, but any Joomla installation is potentially at risk.

Recommendation

• Deploy the Sigma rule detecting potential Path Traversal attempts in web server logs to identify malicious requests (see rule: “Detect Joomla Path Traversal”).
• Deploy the Sigma rule detecting SQL Injection attacks against Joomla to identify and block malicious requests (see rule: “Detect Joomla SQL Injection”).
• Carefully review all Joomla extensions and third-party plugins for known vulnerabilities and apply necessary updates.