CVE-2023-40645 in SC9863A
Summary
by MITRE • 10/25/2023
In Messaging, there is a possible missing permission check. This could lead to local information disclosure with no additional execution privileges needed
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Analysis
by VulDB Data Team • 10/27/2023
The vulnerability identified as CVE-2023-40645 resides within the messaging component of a software system and represents a critical permission validation flaw that undermines the security model of the affected platform. This issue stems from a missing permission check mechanism that allows unauthorized local access to sensitive information. The vulnerability is classified as a local information disclosure vulnerability, meaning that an attacker with local system access can exploit this flaw to obtain confidential data without requiring additional privileges or execution rights. The absence of proper authorization verification creates an attack surface where malicious actors can bypass intended access controls and retrieve information that should remain restricted. This type of vulnerability is particularly concerning because it operates at the system level where local users already possess inherent privileges, making it easier to exploit compared to remote attacks that require additional reconnaissance and exploitation steps. The flaw likely exists in the messaging subsystem's access control implementation where the system fails to validate whether the requesting process or user has appropriate permissions before granting access to message data or related metadata. According to CWE classification, this vulnerability maps to CWE-284: Improper Access Control, which specifically addresses insufficient access control mechanisms that allow unauthorized access to resources. The ATT&CK framework categorizes this under T1074: Data Staged, as the vulnerability enables unauthorized data access and potential staging of sensitive information for exfiltration. The operational impact of this vulnerability extends beyond simple information disclosure, as the retrieved data could include communication metadata, message contents, user identifiers, or system configuration details that could be leveraged for further attacks. Attackers might use the disclosed information to understand system behavior, identify other potential vulnerabilities, or craft more sophisticated attacks against the same system or related components. The lack of additional execution privileges required for exploitation means that this vulnerability can be leveraged by any local user, including potentially compromised accounts or unprivileged processes. This characteristic significantly increases the attack surface and makes the vulnerability more attractive to threat actors who may already have local access through various means such as legitimate user accounts, compromised services, or other initial access vectors. The vulnerability's persistence across system sessions and its potential to remain undetected for extended periods makes it particularly dangerous in environments where local access is common or where access controls are not properly enforced. Organizations may not immediately detect this vulnerability's exploitation due to the subtle nature of information disclosure attacks, which often do not generate obvious alerts or system disruptions. The exploitation of this vulnerability aligns with ATT&CK technique T1005: Data from Local System, which focuses on collecting data from local systems through various means including unauthorized access to stored information. Security professionals should note that this vulnerability represents a fundamental breakdown in the principle of least privilege, where the messaging system fails to properly enforce access controls that should restrict information access based on user roles, permissions, or other security policies. The remediation process for CVE-2023-40645 typically involves implementing proper permission checks within the messaging component to validate user access rights before allowing information retrieval. This requires thorough code review and implementation of robust access control mechanisms that align with established security frameworks. Organizations should also consider implementing additional monitoring and logging for messaging system access to detect anomalous behavior that might indicate exploitation attempts. The vulnerability highlights the importance of comprehensive security testing including access control validation, privilege escalation testing, and local system security assessments to identify similar flaws that may exist in other system components. Regular security audits and penetration testing focused on access control mechanisms can help identify missing permission checks before they can be exploited by malicious actors. Furthermore, implementing defense-in-depth strategies including network segmentation, access control lists, and privilege management systems can help mitigate the impact of such vulnerabilities even when they are present in the system. The vulnerability's classification as a local information disclosure also emphasizes the need for proper system hardening practices and adherence to security baseline configurations that restrict unnecessary local access and enforce strict access controls throughout the system architecture.