CVE-2017-18441 in cPanel
Summary
by MITRE
cPanel before 64.0.21 allows demo accounts to redirect web traffic (SEC-245).
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Analysis
by VulDB Data Team • 07/19/2020
The vulnerability identified as CVE-2017-18441 affects cPanel versions prior to 64.0.21 and represents a significant security flaw in the demonstration account functionality. This issue stems from insufficient validation of web traffic redirection mechanisms within the cPanel demo environment, creating a potential pathway for unauthorized traffic manipulation. The vulnerability specifically impacts the security model of demo accounts which are designed to provide limited access to cPanel functionality while maintaining system isolation from production environments.
The technical flaw manifests in the improper handling of HTTP redirect requests originating from demo accounts. When demo users attempt to redirect web traffic through the cPanel interface, the system fails to adequately validate the destination URLs against established security boundaries. This validation gap allows malicious actors to potentially redirect traffic to external domains or internal systems that should remain inaccessible to demo account holders. The vulnerability operates at the application layer and can be exploited through crafted HTTP requests that leverage the demo account's limited privileges to manipulate traffic routing.
The operational impact of this vulnerability extends beyond simple traffic redirection as it compromises the fundamental security isolation that demo accounts are designed to maintain. Attackers could potentially use this flaw to redirect users to malicious domains, harvest credentials, or gain access to internal network resources that should be protected from demo account access. The security implications are particularly concerning in shared hosting environments where multiple users may have access to the same cPanel instance, as the vulnerability could enable privilege escalation or lateral movement within the hosting infrastructure. This issue directly violates the principle of least privilege and undermines the security boundaries established for demo environments.
Mitigation strategies for CVE-2017-18441 require immediate implementation of the vendor-provided security patch for cPanel version 64.0.21 or later, which addresses the redirect validation flaw through enhanced input sanitization and access control mechanisms. Organizations should also implement network-level restrictions to prevent unauthorized traffic redirection attempts and conduct thorough security audits of demo account configurations. The vulnerability aligns with CWE-601 URL Redirection to Untrusted Site vulnerability category and could be exploited as part of broader attack chains identified in the MITRE ATT&CK framework under the Initial Access and Persistence phases. System administrators should consider implementing additional monitoring for suspicious redirect patterns and establish incident response procedures to address potential exploitation attempts. Regular security assessments of web hosting environments are essential to identify similar validation flaws that could compromise system integrity and user data protection.