CVE-2021-25459 in BlockchainTZService
Summary
by MITRE • 09/10/2021
An improper access control vulnerability in sspInit() in BlockchainTZService prior to SMR Sep-2021 Release 1 allows attackers to start BlockchainTZService.
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Analysis
by VulDB Data Team • 09/12/2021
The vulnerability identified as CVE-2021-25459 represents a critical improper access control flaw within the BlockchainTZService component of a mobile operating system platform. This issue specifically affects the sspInit() function which serves as an initialization routine for the blockchain timezone service. The vulnerability exists in versions prior to the SMR September 2021 Release 1, indicating this was a known security gap that required patching through a security maintenance release. The flaw allows unauthorized attackers to initiate the BlockchainTZService, which represents a significant escalation of privileges since this service typically requires proper authentication and authorization mechanisms to prevent arbitrary execution.
The technical nature of this vulnerability falls under CWE-284, which specifically addresses improper access control issues in software systems. This classification indicates that the system fails to properly enforce access restrictions, allowing unauthorized entities to perform operations that should be restricted to authorized users or processes. The sspInit() function likely contains logic that should validate caller credentials or system context before permitting service initialization, but this validation mechanism has been bypassed or inadequately implemented. This improper access control vulnerability creates a pathway for attackers to execute malicious code or manipulate system components through unauthorized service startup.
The operational impact of this vulnerability extends beyond simple privilege escalation, as the BlockchainTZService typically handles sensitive timezone and blockchain-related data synchronization. When an attacker can initiate this service without proper authorization, they gain access to system resources that may include network communication capabilities, local storage access, and potentially sensitive data processing functions. This represents a significant risk to mobile device security since the blockchain timezone service may be involved in cryptocurrency transactions, time-stamping operations, or other sensitive blockchain activities. The vulnerability could enable attackers to manipulate timezone data, interfere with blockchain operations, or potentially gain further access to other system components through the compromised service initialization.
Mitigation strategies for this vulnerability require immediate deployment of the SMR September 2021 Release 1 which includes the necessary patches to address the access control flaw in sspInit(). Organizations should conduct comprehensive security assessments to identify any potential exploitation attempts that may have occurred before patch deployment. The remediation process should include verifying that proper authentication mechanisms are enforced before service initialization, implementing additional monitoring for unauthorized service access attempts, and ensuring that all system components properly validate caller privileges. Security teams should also review access control policies for the BlockchainTZService and related components to prevent similar issues in other system functions, following established security frameworks that emphasize principle of least privilege and proper authorization controls. This vulnerability demonstrates the importance of rigorous access control implementation in system services that handle sensitive operations, particularly those involving blockchain technologies and time-critical data synchronization functions.