CVE-2017-18478 in cPanel
Summary
by MITRE
In cPanel before 62.0.4 incorrect ACL checks could occur in xml-api for Rearrange Account actions (SEC-207).
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Analysis
by VulDB Data Team • 07/21/2020
The vulnerability identified as CVE-2017-18478 affects cPanel versions prior to 62.0.4 and represents a critical access control flaw within the xml-api component of the system. This issue specifically impacts the Rearrange Account actions functionality, which allows administrators to reorganize account structures within the cPanel environment. The vulnerability stems from inadequate access control list checks that should have prevented unauthorized users from executing certain administrative operations through the xml-api interface.
The technical flaw manifests as a failure in the xml-api authentication and authorization mechanisms when processing Rearrange Account requests. Under normal circumstances, only users with appropriate administrative privileges should be able to perform account reorganization tasks through the xml-api. However, the improper ACL implementation allowed malicious actors or users with limited permissions to bypass these security controls and execute operations that should have been restricted to authorized administrators. This represents a classic privilege escalation vulnerability where insufficient access validation enables unauthorized system manipulation.
The operational impact of this vulnerability extends beyond simple unauthorized access, as it could potentially allow attackers to disrupt account organization structures, potentially leading to data integrity issues or service availability problems. Attackers could exploit this weakness to reorganize accounts in ways that might obscure legitimate administrative activities or create confusion in system management. The vulnerability particularly affects environments where multiple users share administrative access or where proper user privilege management has not been implemented, as it could enable lateral movement within the system and potentially provide pathways to other compromised components.
Organizations should implement immediate mitigations including upgrading to cPanel version 62.0.4 or later, which contains the necessary ACL fixes. Security teams should also conduct thorough audits of existing user permissions and access controls, ensuring that only authorized administrators have access to xml-api functions. The vulnerability aligns with CWE-284 which addresses improper access control, and could potentially map to ATT&CK technique T1078 for valid accounts and privilege escalation. Additional defensive measures include implementing network segmentation to limit xml-api access, monitoring for unusual account reorganization activities, and maintaining comprehensive audit logs of all administrative operations performed through the xml-api interface.