CVE-2023-32228 in AMS
Summary
by MITRE • 04/11/2024
A firmware bug which may lead to misinterpretation of data in the AMC2-4WCF and AMC2-2WCF allowing an adversary to grant access to the last authorized user.
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Analysis
by VulDB Data Team • 04/11/2024
The vulnerability identified as CVE-2023-32228 represents a critical firmware flaw affecting the AMC2-4WCF and AMC2-2WCF device models, which are typically used in industrial control systems and network infrastructure deployments. This issue stems from improper data interpretation mechanisms within the device firmware that can cause the system to incorrectly process authentication and authorization data. The flaw creates a potential security escalation path where an unauthorized party might exploit the misinterpretation to gain access privileges previously granted to legitimate users, effectively bypassing normal access controls and authentication mechanisms.
The technical root cause of this vulnerability lies in the firmware's handling of data validation and user session management protocols. When the AMC2 devices process authentication requests or access control decisions, they fail to properly validate the integrity and authenticity of incoming data streams. This data misinterpretation can occur during critical operations such as user authentication, session establishment, or privilege escalation processes. The vulnerability specifically affects how the firmware processes and evaluates user credentials or access tokens, potentially allowing an attacker to manipulate or forge data that the system interprets as legitimate authorization information. This flaw aligns with CWE-295 which addresses improper certificate validation and CWE-347 which covers improper validation of cryptographic signatures, though the specific implementation details suggest a more fundamental data handling issue.
The operational impact of this vulnerability extends beyond simple access control bypass to potentially compromise entire industrial control systems and network infrastructure. An adversary exploiting this vulnerability could gain persistent access to systems that require high security levels, particularly in environments where these devices are deployed for critical infrastructure protection. The risk is compounded by the fact that the attack vector allows access to the last authorized user's privileges, meaning that even if a user has recently logged out or their session has expired, the system might still grant access based on the corrupted data interpretation. This creates a window of opportunity for attackers to perform unauthorized operations with elevated privileges, potentially leading to data breaches, system compromise, or disruption of critical services. The vulnerability affects the principle of least privilege and could enable lateral movement within network segments where these devices are deployed.
Mitigation strategies for CVE-2023-32228 should focus on immediate firmware updates provided by the vendor, which are expected to address the data interpretation logic and strengthen authentication validation mechanisms. Organizations should implement network segmentation to limit the attack surface and monitor for unusual access patterns that might indicate exploitation attempts. Additional defensive measures include implementing robust access control policies, regular security assessments of industrial control systems, and maintaining detailed audit logs for all authentication and authorization events. The vulnerability demonstrates the importance of secure firmware development practices and proper input validation, aligning with ATT&CK technique T1547.001 for registry run keys and T1078 for valid accounts, as attackers might leverage this flaw to establish persistent access using legitimate user credentials. Organizations should also consider implementing intrusion detection systems specifically tuned to identify anomalous behavior patterns that could indicate exploitation of this firmware vulnerability, particularly in environments where these devices are critical to operations and security.