CVE-2022-47482 in SC9863A
Summary
by MITRE • 03/10/2023
In telephony service, there is a missing permission check. This could lead to local denial of service in telephone service with no additional execution privileges needed.
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Analysis
by VulDB Data Team • 04/04/2023
The vulnerability identified as CVE-2022-47482 represents a critical security flaw within telephony service implementations where a missing permission check creates an avenue for unauthorized local disruption. This weakness exists within the core telephony service framework and demonstrates a fundamental failure in access control mechanisms that should prevent unauthorized operations. The vulnerability specifically affects systems where telephony services operate with elevated privileges but fail to validate whether incoming requests originate from authorized processes or users.
The technical flaw manifests as an insufficient validation of permissions within the telephony service daemon or subsystem. When legitimate telephony operations are performed, the system should verify that the requesting entity possesses appropriate authorization levels before executing sensitive functions. However, in this case, the permission checking mechanism is either completely absent or inadequately implemented, allowing any local process to potentially trigger denial of service conditions within the telephony service. This missing validation creates a path for malicious actors or compromised processes to disrupt telephone functionality without requiring additional privileges beyond basic local execution rights.
The operational impact of this vulnerability extends beyond simple service disruption to potentially compromise the reliability and availability of telephony infrastructure. Local denial of service conditions can result in complete loss of telephone functionality for affected systems, impacting communication services that may be critical for business operations or emergency services. The vulnerability's exploitation requires minimal privileges, making it particularly dangerous as it can be leveraged by processes with basic user accounts or compromised applications. This characteristic aligns with attack patterns described in the attack tree methodology where attackers seek to exploit minimal privilege requirements to achieve maximum impact.
From a cybersecurity perspective, this vulnerability maps directly to CWE-284, which describes improper access control in software systems. The missing permission check represents a classic access control flaw where the system fails to properly enforce authorization boundaries. Additionally, this vulnerability demonstrates characteristics consistent with ATT&CK technique T1489, which involves disrupting services through manipulation of system processes. The lack of proper permission validation creates an attack surface that allows adversaries to manipulate telephony service behavior through local execution, potentially leading to cascading failures in communication infrastructure.
Mitigation strategies for CVE-2022-47482 should focus on implementing comprehensive permission checking mechanisms within the telephony service framework. System administrators should ensure that all telephony service operations perform proper authentication and authorization checks before executing sensitive functions. This includes validating process ownership, user permissions, and access levels before allowing operations to proceed. The implementation should follow principle of least privilege concepts where services operate with minimal necessary permissions and all interactions are properly validated. Regular security audits and code reviews should be conducted to identify similar permission checking gaps in telephony service implementations, particularly focusing on areas where system-level operations are performed without proper access validation. Organizations should also consider implementing monitoring solutions to detect anomalous telephony service behavior that might indicate exploitation attempts.