Joomla! Component Sponsor Wall 8.0 SQL Injection (CVE-2017-20264)

CVE-2017-20264 details an SQL injection vulnerability in Joomla! Component Sponsor Wall version 8.0, developed by Pulseextensions. This flaw allows unauthenticated attackers to execute arbitrary SQL queries by manipulating the wallid parameter within specific GET requests. The vulnerability is triggered when malicious SQL code is injected into the wallid parameter when making requests to index.php with option=com_sponsorwall&task=click. Successful exploitation grants attackers the ability to extract sensitive database information, including user credentials, hashed passwords, and critical configuration data, posing a significant risk to the integrity and confidentiality of the affected Joomla! instance and its backend database. Although the CVE was published recently, the vulnerability itself dates back to 2017, indicating that unpatched systems remain at risk.

Attack Chain

1. Reconnaissance: An attacker identifies a target web server hosting a Joomla! instance running the vulnerable Component Sponsor Wall 8.0.
2. Initial Access: The attacker crafts a specially formed HTTP GET request targeting the index.php endpoint of the Joomla! application.
3. Parameter Manipulation: The GET request includes the option=com_sponsorwall&task=click&wallid= parameter, into which the attacker injects malicious SQL code designed to bypass input sanitization.
4. Arbitrary Query Execution: The vulnerable Joomla! component processes the wallid parameter without proper validation, leading to the execution of the injected SQL queries against the underlying database.
5. Information Disclosure: The attacker leverages the SQL injection to extract sensitive database information, which may include user credentials (usernames and hashed passwords), session tokens, and system configuration data.
6. Data Exfiltration & Credential Harvesting: The extracted sensitive data, particularly credentials, is exfiltrated by the attacker for further analysis or use.
7. Persistence and Lateral Movement: The attacker uses the stolen credentials to gain unauthorized access to the Joomla! administrator panel or other connected systems, potentially establishing persistence, defacing the website, or escalating privileges.

Impact

Successful exploitation of CVE-2017-20264 can lead to severe consequences for affected organizations. Attackers can gain full read access to the entire database, compromising sensitive information such as customer data, proprietary business details, and internal credentials. The extraction of administrator credentials can grant full control over the Joomla! website, enabling website defacement, content manipulation, arbitrary code execution (via plugin installation or theme modification), and serving malware to legitimate visitors. The exposure of configuration data can further aid in lateral movement within the network or lead to access to other connected services, resulting in significant data breaches, reputational damage, and compliance violations.

Recommendation

• Immediately update or remove Joomla! Component Sponsor Wall version 8.0 to a patched version or a different component if an update is not available to mitigate CVE-2017-20264.
• Deploy the provided Sigma rule "Detects CVE-2017-20264 Exploitation — Joomla! Sponsor Wall SQL Injection Attempt" to your SIEM for early detection of exploitation attempts.
• Ensure web server access logs are enabled and retained, specifically logging full URI paths and query strings for the webserver logsource to enable effective detection.
• Review web application firewall (WAF) configurations to ensure robust SQL injection protection rules are active and up-to-date.