CVE-2024-20015 in MT6739
Summary
by MITRE • 02/05/2024
In telephony, there is a possible escalation of privilege due to a permissions bypass. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID: ALPS08441419; Issue ID: ALPS08441419.
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Analysis
by VulDB Data Team • 02/25/2024
This vulnerability represents a critical permissions bypass flaw within telephony subsystems that enables local privilege escalation without requiring any additional execution privileges or user interaction for exploitation. The issue stems from improper access control mechanisms within the telephony service components, allowing malicious actors with local system access to escalate their privileges to administrative levels. The vulnerability exists in the underlying telephony framework where insufficient permission checks are implemented during critical operations, creating an attack vector that can be leveraged by unauthorized users to gain elevated system privileges. The absence of user interaction requirements makes this particularly dangerous as it can be exploited automatically without any human intervention, potentially allowing attackers to establish persistent access to the system. This flaw directly impacts the security model of telephony services by undermining the principle of least privilege and allowing unauthorized code execution with elevated permissions.
The technical implementation of this vulnerability involves a specific weakness in the permission validation process within the telephony subsystem where certain privileged operations can be invoked through legitimate system interfaces without proper authentication checks. The flaw likely exists in how the system handles inter-process communication or service calls within the telephony framework, where the authorization mechanisms fail to properly validate the calling process identity or privileges. This type of vulnerability aligns with CWE-284 which describes improper access control issues, specifically focusing on inadequate permission checks that allow unauthorized access to privileged functions. The vulnerability demonstrates a classic case of privilege escalation through bypass of security controls that should normally prevent unauthorized access to system resources.
The operational impact of this vulnerability extends beyond simple privilege escalation as it provides attackers with complete administrative control over telephony services and potentially the underlying operating system. Once exploited, the attacker can access sensitive telephony data, modify call routing configurations, intercept communications, and potentially use the elevated privileges to pivot to other system components. The local nature of the exploitation means that any user with access to the system can potentially leverage this vulnerability, making it particularly concerning for environments where multiple users have local access. This vulnerability can be exploited to create backdoors, modify system configurations, or access confidential telephony information that could compromise the entire communication infrastructure. The implications for enterprise telephony systems are significant as this could allow attackers to disrupt critical communication services or gain access to sensitive business communications.
Mitigation strategies for this vulnerability should focus on implementing proper access controls and privilege validation mechanisms within the telephony subsystem. System administrators should apply the vendor-provided patch ALPS08441419 immediately to address the identified permissions bypass issue. Additionally, implementing network segmentation and access controls can limit the potential impact if the vulnerability is exploited. The system should be configured to minimize local user privileges and ensure that telephony services run with the minimum required permissions. Security monitoring should be enhanced to detect unusual privilege escalation attempts or unauthorized access to telephony services. Organizations should also review their telephony service configurations to ensure that proper authentication and authorization mechanisms are in place. The remediation process should include verifying that all telephony-related services properly validate caller privileges before executing privileged operations. Regular security assessments of telephony subsystems should be conducted to identify similar access control weaknesses that could be exploited in similar fashion. This vulnerability highlights the importance of maintaining secure coding practices and proper privilege management in system services that handle sensitive communication data.