CVE-2012-4687 in AWAM Bluetooth Reader
Summary
by MITRE
Post Oak AWAM Bluetooth Reader Traffic System does not use a sufficient source of entropy for private keys, which makes it easier for man-in-the-middle attackers to spoof a device by predicting a key value.
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Analysis
by VulDB Data Team • 07/10/2025
The CVE-2012-4687 vulnerability affects the Post Oak AWAM Bluetooth Reader Traffic System, a security solution designed for access control and authentication in physical security environments. This system utilizes Bluetooth technology to facilitate communication between reader devices and authentication credentials, typically employed in enterprise and government security infrastructures. The vulnerability stems from the system's insufficient entropy in generating cryptographic private keys, creating a fundamental weakness in its security architecture that directly impacts the integrity of the authentication process.
The technical flaw resides in the cryptographic key generation mechanism where the system fails to utilize adequate entropy sources during the creation of private keys. This weakness allows attackers to predict key values through statistical analysis or pattern recognition techniques, fundamentally undermining the security model that relies on unpredictable cryptographic keys. The insufficient entropy means that the random number generation process lacks the mathematical unpredictability required for strong cryptographic security, making it possible for adversaries to reverse-engineer or brute-force the private key values used in the system's authentication protocol. This vulnerability aligns with CWE-330, which specifically addresses insufficient entropy in cryptographic systems, and represents a critical failure in the implementation of secure key generation practices.
The operational impact of this vulnerability is severe and multifaceted, particularly for organizations relying on the Post Oak AWAM system for physical security. Man-in-the-middle attackers can exploit this weakness to impersonate legitimate devices within the network, potentially gaining unauthorized access to secured facilities or systems. The ability to predict key values means that attackers can create fraudulent authentication tokens or masquerade as authorized readers, leading to complete compromise of the access control system. This vulnerability affects the core trust model of the system, as it undermines the fundamental assumption that private keys remain secret and unpredictable. The attack surface extends beyond simple credential theft to include potential system-wide compromise, especially when considering that Bluetooth-based systems often operate in environments where physical proximity is required for authentication, making the attack vectors more accessible to determined adversaries.
Organizations should implement immediate mitigations including replacement of affected hardware with systems that utilize proper entropy sources for cryptographic key generation, and deployment of additional network monitoring to detect anomalous authentication patterns. The system should be upgraded to employ cryptographically secure random number generators that meet industry standards such as those specified in NIST SP 800-90A for random number generation. Network segmentation and additional authentication layers should be implemented to reduce the attack surface, while regular security audits should verify that key generation processes meet minimum entropy requirements of at least 128 bits of entropy for cryptographic strength. The vulnerability demonstrates the critical importance of proper entropy implementation in security systems and serves as a reminder that even seemingly minor implementation flaws in cryptographic components can lead to complete system compromise, aligning with ATT&CK technique T1552.004 for credential access through weak cryptographic implementations.