CVE-2022-47484 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 • 03/11/2023
The vulnerability identified as CVE-2022-47484 represents a critical security flaw within telephony service implementations where a missing permission check creates an avenue for unauthorized local denial of service attacks. This weakness specifically affects telephony service components that handle telephone operations and communications, making it particularly concerning for systems that rely heavily on voice communication services. The vulnerability exists at the service level where proper authorization controls have been omitted, allowing any local process or user to potentially disrupt telephone functionality without requiring elevated privileges or additional execution rights. The absence of mandatory access controls creates a scenario where malicious actors can exploit this gap to terminate or interfere with telephony services, resulting in service disruption for legitimate users. This type of vulnerability falls under the broader category of improper access control issues that are commonly classified as CWE-284, which deals with inadequate permissions and access controls in software systems.
The technical implementation of this vulnerability stems from the failure to properly validate access permissions within the telephony service framework. When telephony service components receive requests or commands, they should verify that the requesting entity possesses appropriate authorization levels before executing any operations. However, in the affected implementations, this validation step has been omitted or bypassed, creating an attack surface where local processes can manipulate telephony functions directly. The lack of permission checks means that even unprivileged local users or processes can potentially send commands that terminate telephone service operations or interfere with ongoing calls. This flaw is particularly dangerous because it operates at the system level where telephony services are typically running with sufficient privileges to affect core communication functions. The vulnerability can be exploited through various means including direct service manipulation, process injection, or by leveraging other local exploits that can elevate privileges to the telephony service level. The attack vector requires no additional execution privileges because the underlying service itself is designed to operate with sufficient permissions to affect telephone functionality, making the missing permission check a critical oversight in the security architecture.
The operational impact of CVE-2022-47484 extends beyond simple service disruption to potentially compromise the reliability and availability of telephony infrastructure. Organizations relying on affected telephony services may experience unexpected service outages that can affect business operations, emergency communications, or critical communication channels. The local nature of the vulnerability means that attackers do not need network access or remote exploitation capabilities, which significantly increases the attack surface and makes the vulnerability more accessible. This type of denial of service attack can be particularly damaging in environments where telephony services are integral to business continuity, such as call centers, emergency response systems, or industrial control environments. The vulnerability can be exploited by any local user or process on the system, including potentially compromised applications or malicious code that has gained local execution capabilities. The lack of additional privileges required for exploitation makes this vulnerability particularly attractive to attackers who may be looking to disrupt services without having to overcome additional security barriers. This weakness can be categorized under ATT&CK technique T1499 which involves network denial of service attacks, though in this case the attack operates locally within the system rather than through network-based methods.
Organizations should implement immediate mitigations to address this vulnerability by ensuring proper permission checks are enforced within telephony service components. The primary solution involves implementing mandatory access controls that verify authorization levels before allowing any telephony service operations to proceed. This can be achieved through proper service design that incorporates access control lists, role-based permissions, or other authorization mechanisms that prevent unauthorized manipulation of telephony functions. System administrators should review existing telephony service configurations and ensure that all service components properly validate access permissions before executing operations. The remediation process should include updating service implementations to include proper permission validation routines and conducting security reviews of all telephony service components. Additionally, organizations should consider implementing monitoring and alerting mechanisms that can detect unauthorized attempts to manipulate telephony services, which can help identify potential exploitation attempts. Regular security assessments and penetration testing should be conducted to identify similar permission-related vulnerabilities across the telephony service infrastructure. The vulnerability also highlights the importance of adhering to security best practices and following established frameworks such as the OWASP Top Ten or NIST cybersecurity guidelines to ensure that access control mechanisms are properly implemented and maintained. Organizations should also consider implementing principle of least privilege configurations where telephony services operate with minimal required permissions to reduce the potential impact of such vulnerabilities.