CVE-2017-18429 in cPanel
Summary
by MITRE
In cPanel before 66.0.2, Apache HTTP Server SSL domain logs can persist on disk after an account termination (SEC-291).
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Analysis
by VulDB Data Team • 07/18/2020
The vulnerability identified as CVE-2017-18429 represents a critical data persistence issue within the cPanel hosting control panel environment that affects versions prior to 66.0.2. This flaw specifically addresses the improper handling of Apache HTTP Server SSL domain logs when user accounts are terminated, creating a scenario where sensitive logging data remains accessible on the filesystem long after the account should have been completely removed. The issue stems from inadequate cleanup procedures during the account termination process, where log files containing potentially sensitive information about SSL connections and domain access patterns are not properly deleted or sanitized from the system.
From a technical perspective, this vulnerability operates at the intersection of account lifecycle management and file system permissions within the cPanel architecture. When an account is terminated, the system should execute a comprehensive cleanup routine that removes all associated data including log files, configuration settings, and user-specific resources. However, in affected versions, the SSL domain log files that are generated during the account's operational period are left behind on the disk, creating a persistent data repository that could contain information about SSL certificate usage, domain access patterns, and potentially sensitive connection details. This represents a failure in proper resource disposal and system cleanup protocols that aligns with CWE-200, which addresses improper information exposure, and CWE-532, which covers information exposure through log files.
The operational impact of this vulnerability extends beyond simple data retention concerns and creates significant security implications for both the hosting provider and their customers. The persistent SSL logs can contain information that might be valuable to malicious actors, including details about SSL certificate usage, domain configurations, and potentially even patterns of network activity that could aid in targeted attacks. These logs might reveal information about encryption methods used, certificate authorities involved, and access patterns that could be exploited to understand the hosting environment's structure and potentially identify other vulnerable systems. The vulnerability also creates a potential data breach vector where sensitive information could be accessed by unauthorized users who gain access to the hosting server's filesystem, particularly in environments where proper access controls are not fully enforced.
Organizations affected by this vulnerability should immediately implement the recommended upgrade path to cPanel version 66.0.2 or later, which contains the necessary patches to address the improper log cleanup behavior. Additionally, system administrators should conduct thorough audits of existing log files to identify and manually remove any persistent SSL domain logs that may have been left behind by terminated accounts. The remediation process should include implementing automated cleanup procedures that verify proper deletion of all account-related data during termination processes, and establishing monitoring systems to detect similar issues in other components of the hosting infrastructure. Security teams should also consider implementing file system access controls and regular security assessments to ensure that no sensitive data remains accessible after account termination, aligning with best practices from the ATT&CK framework under the T1070.004 technique for Indicator Removal on Host and the broader T1070 category for Tool Software. This vulnerability highlights the importance of comprehensive account lifecycle management and proper resource disposal in multi-tenant hosting environments where data isolation and privacy are paramount concerns.