CVE-2017-18442 in cPanel
Summary
by MITRE
cPanel before 64.0.21 allows demo accounts to execute Cpanel::SPFUI API commands (SEC-246).
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Analysis
by VulDB Data Team • 07/19/2020
The vulnerability identified as CVE-2017-18442 affects cPanel versions prior to 64.0.21 and represents a significant authorization flaw that undermines the security boundaries between standard user accounts and demo accounts. This issue stems from insufficient access controls within the Cpanel::SPFUI API module, which is responsible for managing Sender Policy Framework configurations. The vulnerability specifically allows unauthorized execution of administrative API commands through demo accounts, which should typically be restricted to limited functionality and non-administrative operations.
The technical flaw manifests in the improper validation of account permissions within the API command execution framework. Demo accounts in cPanel are designed to provide limited access to system features for demonstration purposes only, yet this vulnerability enables them to bypass normal permission checks and execute commands that should be restricted to administrative users. The Cpanel::SPFUI API module, which handles email authentication configuration, becomes a vector for privilege escalation when accessed through compromised demo account credentials. This represents a classic case of insufficient authorization checking, where the system fails to properly verify that the executing account possesses the necessary privileges for the requested operation.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with the ability to manipulate email authentication settings that could be used for spamming or phishing activities. By executing Cpanel::SPFUI API commands, an attacker could modify SPF records, DKIM configurations, and other email security measures that protect domain reputation. This capability could enable large-scale email abuse campaigns, as the attacker could potentially modify multiple domains' email authentication settings without detection. The vulnerability is particularly concerning in shared hosting environments where demo accounts are commonly used for testing purposes, as these accounts often have less stringent security monitoring than production user accounts.
Organizations affected by this vulnerability should implement immediate mitigations including updating to cPanel version 64.0.21 or later, which contains the necessary patches to restrict demo account access to administrative API commands. Security monitoring should be enhanced to detect unusual API activity from demo accounts, particularly when such accounts attempt to execute commands related to email authentication. The vulnerability aligns with CWE-284, which addresses insufficient access control, and maps to ATT&CK techniques such as privilege escalation and command and control through API abuse. System administrators should also consider implementing additional controls like account activity logging, access control lists, and regular security audits to prevent similar issues from occurring in other components of the cPanel infrastructure.