CVE-2008-4104 in Joomla
Summary
by MITRE
Multiple open redirect vulnerabilities in Joomla! 1.5 before 1.5.7 allow remote attackers to redirect users to arbitrary web sites and conduct phishing attacks via a "passed in" URL.
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Analysis
by VulDB Data Team • 04/21/2019
The vulnerability described in CVE-2008-4104 represents a critical open redirect flaw affecting Joomla handles URL parameters that are passed through the application's internal redirect functions, allowing attackers to craft malicious links that appear legitimate but redirect users to completely different domains.
The technical implementation of this vulnerability occurs when Joomla! processes redirect URLs without proper sanitization or validation of the target domain. Attackers can exploit this by constructing URLs that contain malicious redirect parameters, which are then processed by the CMS's redirect functionality. The flaw exists in the application's parameter handling logic where user-supplied URLs are accepted without verification of their destination, enabling attackers to specify arbitrary domains in redirect operations. This type of vulnerability falls under CWE-601, which specifically addresses open redirect vulnerabilities where applications redirect users to untrusted domains without proper validation.
From an operational perspective, this vulnerability poses significant risks to both end users and system administrators. The primary threat vector involves phishing attacks where malicious actors craft deceptive links that appear to originate from legitimate Joomla was designed to facilitate legitimate navigation between different sections of the application, but the lack of proper input validation transforms this functionality into a security risk.
The exploitation of this vulnerability requires minimal technical skill and can be accomplished through simple URL manipulation techniques. Attackers typically construct malicious URLs containing the vulnerable redirect parameters and distribute them through various channels including email campaigns, social media, or compromised websites. When users click on these links, they are seamlessly redirected to attacker-controlled domains without any warning or indication that their navigation has been altered. This makes the attack particularly effective as users remain unaware of the redirection until they are already on the malicious site, which aligns with ATT&CK technique T1566 for phishing attacks.
Organizations running vulnerable versions of Joomla installation using version 1.5 prior to 1.5.7 is potentially vulnerable, and the impact can be severe given that many organizations rely on Joomla! for their web presence. Security professionals should implement immediate remediation measures including upgrading to the patched version 1.5.7 or later, which contains proper URL validation and sanitization mechanisms. Additional mitigations include implementing web application firewalls that can detect and block suspicious redirect patterns, conducting user education regarding phishing awareness, and monitoring for unusual redirect behavior in web application logs.
The vulnerability demonstrates the importance of input validation and the principle of least privilege in web application security design. Proper implementation would require that all redirect parameters be validated against a whitelist of trusted domains or subjected to strict URL parsing and validation before any redirection occurs. Organizations should also consider implementing Content Security Policy headers and other browser-based protections to provide additional layers of defense against such attacks. Regular security assessments and vulnerability scanning should be conducted to identify similar issues in other web applications, as open redirect vulnerabilities are common across many CMS platforms and web frameworks. The remediation process should include thorough testing to ensure that legitimate redirect functionality continues to operate while eliminating the security risk associated with unvalidated user input.