CVE-2009-0368 in OpenSC
Summary
by MITRE
OpenSC before 0.11.7 allows physically proximate attackers to bypass intended PIN requirements and read private data objects via a (1) low level APDU command or (2) debugging tool, as demonstrated by reading the 4601 or 4701 file with the opensc-explorer or opensc-tool program.
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Analysis
by VulDB Data Team • 05/15/2025
The vulnerability identified as CVE-2009-0368 represents a critical security flaw in the OpenSC smart card framework version 0.11.6 and earlier, which enables unauthorized access to sensitive cryptographic data through direct manipulation of low-level communication protocols. This issue affects the fundamental security model of smart card authentication systems that rely on proper PIN validation mechanisms to protect private key material and sensitive data objects. The vulnerability stems from insufficient validation of authentication states within the APDU (Application Protocol Data Unit) processing layer, allowing attackers with physical proximity to bypass the intended security controls that should prevent access to protected data.
The technical exploitation of this vulnerability occurs through two primary attack vectors that demonstrate a fundamental flaw in the framework's security architecture. The first vector involves direct manipulation of low-level APDU commands that should normally be rejected when proper PIN authentication has not been established. The second vector utilizes debugging tools that can be employed to directly access and read protected data objects within the smart card's memory structure. This attack demonstrates a failure in the security boundary enforcement mechanisms that should prevent unauthorized access to private data objects, particularly those identified by the file identifiers 4601 and 4701 which contain sensitive cryptographic material.
The operational impact of this vulnerability extends beyond simple data theft to compromise the entire trust model of smart card-based authentication systems. When an attacker can bypass PIN requirements through physical proximity, they gain access to private keys, certificates, and other sensitive data that should remain protected even when the card is in use. This represents a failure in the principle of least privilege and undermines the core security assumptions that organizations rely upon when implementing smart card solutions for authentication, digital signatures, and secure communications. The vulnerability affects any system that depends on OpenSC for smart card management, including enterprise authentication systems, secure email solutions, and cryptographic token implementations.
The attack methodology exploits weaknesses in the APDU command processing and debugging interface implementations, where proper authentication state checks are either missing or inadequately enforced. This vulnerability aligns with CWE-284, which addresses improper access control, and demonstrates how insufficient input validation and authentication state management can lead to complete bypass of security controls. From an attack framework perspective, this vulnerability maps to techniques described in the MITRE ATT&CK framework under privilege escalation and credential access categories, specifically targeting the manipulation of authentication tokens and cryptographic material. Organizations implementing OpenSC-based solutions should implement immediate mitigations including upgrading to version 0.11.7 or later, disabling unnecessary debugging interfaces, and implementing additional access controls at the application layer to prevent unauthorized data access.
The broader implications of this vulnerability highlight the critical importance of proper security testing and validation of cryptographic frameworks, particularly those that handle sensitive authentication data. Smart card security models depend entirely on the proper enforcement of access controls at multiple levels, and failures at any point in this chain can result in complete compromise of the security infrastructure. This vulnerability serves as a reminder that physical proximity attacks remain a significant threat vector that must be properly addressed through both hardware and software security controls, and that cryptographic frameworks must be rigorously tested for proper state management and access control enforcement. The security implications extend to any organization relying on smart card authentication where the compromise of a single device could potentially lead to widespread credential compromise and unauthorized access to protected systems and data.