CVE-2018-5340 in Desktop Central
Summary
by MITRE
An issue was discovered in Zoho ManageEngine Desktop Central 10.0.124 and 10.0.184: database access using a superuser account (specifically, an account with permission to write to the filesystem via SQL queries).
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Analysis
by VulDB Data Team • 03/26/2020
The vulnerability identified as CVE-2018-5340 represents a critical privilege escalation flaw within Zoho ManageEngine Desktop Central versions 10.0.124 and 10.0.184. This issue stems from improper database access controls that allow authenticated users to leverage superuser credentials for unauthorized system operations. The vulnerability specifically enables attackers to execute SQL queries that grant write permissions to the filesystem, effectively bypassing normal security boundaries that should protect system resources from unauthorized modification. This flaw operates under the broader context of insecure database configuration and privilege management, where administrative database accounts are improperly exposed or misconfigured to allow excessive permissions beyond what is necessary for normal operations. The vulnerability directly relates to CWE-269 which addresses improper privileges for a resource and CWE-787 which covers out-of-bounds write conditions, both of which are commonly exploited in database-based privilege escalation attacks.
The technical implementation of this vulnerability involves the exploitation of database connection strings or query interfaces that permit superuser-level SQL operations. When an authenticated user can access database functions that allow file system write operations through SQL commands, they effectively gain administrative control over the underlying operating system. This occurs because the database superuser account is configured with elevated permissions that include file system access capabilities, which should typically be restricted to system administrators only. The attack vector leverages the fact that database connections often operate with higher privileges than necessary for standard user operations, creating a pathway for malicious users to escalate their privileges through database interfaces. This type of vulnerability is particularly dangerous because it can be exploited by users with minimal privileges who can then perform actions equivalent to system administrators, including modifying system files, installing malicious software, or accessing sensitive data.
The operational impact of CVE-2018-5340 extends far beyond simple data theft or modification, as it provides attackers with complete system compromise capabilities. Once exploited, an attacker can use the elevated database privileges to write arbitrary files to the system, potentially installing backdoors, rootkits, or other malicious components that persist across system reboots. The vulnerability also enables attackers to manipulate system configurations, modify user accounts, and potentially escalate to domain administrator privileges if the system is part of a larger network infrastructure. From an enterprise security perspective, this vulnerability undermines the principle of least privilege and creates a significant attack surface that can be leveraged for lateral movement within networks. The impact is particularly severe for organizations using ManageEngine Desktop Central for endpoint management, as the compromised system can be used to attack other connected devices and servers. This vulnerability aligns with ATT&CK technique T1078 which covers valid accounts and T1059 which covers command and scripting interpreter, as attackers can leverage the compromised database access to execute system commands and maintain persistence.
Organizations should implement immediate mitigations including restricting database user permissions to the minimum required for normal operations, disabling unnecessary database write capabilities for standard user accounts, and implementing proper network segmentation to limit access to database servers. The recommended approach involves conducting comprehensive privilege audits to identify and revoke excessive database permissions, particularly for superuser accounts that are not required for daily operations. Additionally, organizations should implement database activity monitoring and logging to detect anomalous SQL query patterns that might indicate exploitation attempts. Security patches released by Zoho should be applied immediately to address the underlying configuration issues that allow superuser access to file system operations. Network-based controls such as firewalls and access control lists should be configured to restrict database server access to only trusted administrative workstations and applications. Regular security assessments should include verification of database privilege configurations and testing of access controls to ensure that no unintended superuser capabilities remain enabled. The vulnerability also highlights the importance of secure configuration management practices and regular security reviews of all database connections and user permissions within enterprise environments.