CVE-2015-4668 in Xsuite
Summary
by MITRE
Open redirect vulnerability in Xsuite 2.3.0 and 2.4.3.0 allows remote attackers to redirect users to arbitrary web sites and conduct phishing attacks via a URL in the redirurl parameter.
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Analysis
by VulDB Data Team • 03/22/2025
The CVE-2015-4668 vulnerability represents a critical open redirect flaw discovered in Xsuite versions 2.3.0 and 2.4.3.0, exposing systems to sophisticated social engineering attacks. This vulnerability resides in the application's handling of user input through the redirurl parameter, which is processed without adequate validation or sanitization. The flaw enables remote attackers to manipulate the application's redirect functionality, potentially directing unsuspecting users to malicious websites that appear legitimate. The vulnerability falls under the category of CWE-601, which specifically addresses open redirect vulnerabilities where applications redirect users to untrusted destinations, making it a direct descendant of the well-known CWE-20 and CWE-79 categories that encompass input validation and injection flaws.
The technical exploitation of this vulnerability occurs when an attacker crafts a malicious URL containing a crafted redirurl parameter that points to a phishing site or malicious payload. When a victim clicks on such a link, the application processes the parameter without proper validation, resulting in an automatic redirect to the attacker-controlled destination. The flaw demonstrates a fundamental lack of input sanitization and output encoding controls, which are essential components of secure application development practices. This vulnerability can be leveraged in conjunction with other attack vectors, such as spear phishing campaigns, where attackers use the open redirect as a stepping stone to deliver malware or harvest credentials from unsuspecting users who believe they are navigating to legitimate websites.
The operational impact of CVE-2015-4668 extends beyond simple redirection, as it creates a significant attack surface that can facilitate more complex security breaches. Organizations using affected Xsuite versions face potential reputational damage when users are redirected to malicious sites, as well as the risk of credential theft and data exfiltration. The vulnerability can be particularly dangerous in enterprise environments where users trust internal applications and may not recognize the legitimacy of redirected URLs. From an attacker perspective, this vulnerability aligns with ATT&CK technique T1566, which covers social engineering tactics, specifically the use of phishing and spearphishing to gain initial access. The flaw also relates to ATT&CK technique T1071, covering application layer protocol usage, as it exploits HTTP redirect mechanisms to manipulate application behavior.
Mitigation strategies for this vulnerability should include immediate patching of affected Xsuite versions to address the input validation flaw in the redirurl parameter handling. Organizations should implement comprehensive input validation controls that sanitize all user-supplied data before processing, particularly for redirect parameters. The implementation of a whitelist-based approach for redirect destinations, where only pre-approved URLs are permitted, provides an additional layer of defense against unauthorized redirection. Security teams should also deploy web application firewalls that can detect and block suspicious redirect patterns, as well as implement proper URL validation mechanisms that ensure redirect targets are within the organization's trusted domain boundaries. Regular security assessments and penetration testing should include verification of redirect functionality to prevent similar vulnerabilities from emerging in other application components. The remediation process should also involve user education to help identify suspicious redirects and establish clear protocols for reporting potentially malicious redirection attempts.