CVE-2018-18387 in PlaySMS
Summary
by MITRE
playSMS through 1.4.2 allows Privilege Escalation through Daemon abuse.
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Analysis
by VulDB Data Team • 04/07/2020
The vulnerability CVE-2018-18387 represents a critical privilege escalation flaw in playSMS version 1.4.2 and earlier, where an attacker can abuse daemon processes to gain elevated system privileges. This vulnerability specifically targets the daemon execution mechanism within the playSMS application, which is designed to handle background processes for SMS messaging operations. The daemon component typically runs with elevated privileges to perform system-level operations such as sending SMS messages through various gateways and managing system resources. However, the implementation contains a flaw that allows unauthorized users to manipulate or hijack these daemon processes, thereby bypassing normal access controls and gaining administrative privileges.
The technical exploitation of this vulnerability stems from improper privilege handling within the daemon execution framework. When playSMS initializes its daemon processes, it fails to properly validate or restrict the execution context of these background services. Attackers can leverage this weakness by crafting specific inputs or manipulating the daemon startup procedures to execute arbitrary code with elevated privileges. This flaw typically occurs due to insufficient input sanitization and improper privilege separation between user-level processes and system-level daemon operations. The vulnerability can be classified under CWE-276, which deals with incorrect privileges, and aligns with ATT&CK technique T1068, which covers exploit for privilege escalation.
The operational impact of this vulnerability is severe as it allows attackers to completely compromise the playSMS system and potentially the underlying operating system. Once escalated to administrative privileges, an attacker can access all system resources, modify or delete sensitive data, install malware, and establish persistent access. The daemon abuse aspect means that the compromise can occur through legitimate system processes, making detection more difficult. This vulnerability particularly affects organizations that rely on playSMS for SMS communication services, as it could lead to complete system takeover and data breaches. The impact extends beyond just the application itself, as successful exploitation could enable lateral movement within network environments where playSMS is deployed, potentially affecting multiple systems.
Mitigation strategies for CVE-2018-18387 involve immediate patching of the playSMS application to version 1.4.3 or later, which contains the necessary fixes for daemon privilege handling. System administrators should also implement proper privilege separation by ensuring that daemon processes run with minimal required privileges rather than administrative rights. Additional security measures include implementing proper input validation and sanitization for all user inputs that might influence daemon execution, monitoring daemon process behavior for unusual activities, and conducting regular security audits of the playSMS installation. Network segmentation and access controls should be enforced to limit the potential impact of a successful exploitation. Organizations should also consider implementing intrusion detection systems to monitor for suspicious daemon activities and maintain regular backups to ensure system recovery capabilities in case of successful compromise. The vulnerability highlights the importance of following secure coding practices and privilege separation principles as outlined in industry security frameworks and standards.