CVE-2024-45616 in libopensc
Summary
by MITRE • 09/04/2024
A vulnerability was found in OpenSC, OpenSC tools, PKCS#11 module, minidriver, and CTK. An attacker could use a crafted USB Device or Smart Card, which would present the system with a specially crafted response to APDUs. When buffers are partially filled with data, initialized parts of the buffer can be incorrectly accessed.
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Analysis
by VulDB Data Team • 07/05/2025
The vulnerability identified as CVE-2024-45616 represents a critical buffer handling flaw within OpenSC ecosystem components including tools, PKCS#11 module, minidriver, and CTK implementations. This vulnerability manifests when systems process crafted USB devices or smart cards that respond to APDU commands with specially constructed data payloads. The flaw stems from improper buffer management where partially filled buffers contain uninitialized data that gets incorrectly accessed during subsequent processing operations. The vulnerability affects multiple layers of the OpenSC infrastructure, creating a wide attack surface that spans from hardware interaction to software processing components.
The technical exploitation of this vulnerability occurs through malformed APDU responses that manipulate buffer states within the OpenSC framework. When the system encounters these crafted responses, it processes partially filled buffers without proper validation of the data boundaries or initialization status. This incorrect buffer access pattern can lead to information disclosure, memory corruption, or potentially arbitrary code execution depending on the specific context of buffer usage. The vulnerability is categorized under CWE-129 as "Improper Validation of Array Index" and additionally relates to CWE-476 as "NULL Pointer Dereference" when uninitialized buffer sections are accessed. The attack vector leverages the fundamental trust placed in hardware responses within smart card communication protocols, making it particularly dangerous in security-sensitive environments where OpenSC is deployed for cryptographic operations.
Operational impact of CVE-2024-45616 extends beyond simple data corruption scenarios to potentially compromise entire security infrastructures that rely on OpenSC for smart card management and cryptographic operations. Systems utilizing OpenSC for authentication, digital signatures, or secure key storage become vulnerable to attacks that could result in credential theft, unauthorized access to protected resources, or complete system compromise. The vulnerability affects environments where smart card readers and USB devices are actively used for security purposes, including enterprise authentication systems, government security applications, and financial services that depend on PKCS#11 compliant cryptographic operations. Organizations running affected OpenSC versions face potential exposure during any smart card interaction, particularly when processing untrusted devices or during automated card enrollment processes. The attack complexity is relatively low as it only requires crafting specific APDU responses that trigger the buffer handling flaw, making it an attractive target for adversaries seeking to exploit smart card infrastructure.
Mitigation strategies for CVE-2024-45616 should focus on immediate software updates from OpenSC maintainers, as the vulnerability requires core library modifications to address the buffer handling logic. System administrators should implement network segmentation to limit smart card device access to trusted environments and establish strict device authorization policies. Additional protective measures include deploying runtime monitoring solutions that can detect anomalous APDU response patterns and implementing input validation controls that sanitize all external smart card communications. Organizations should also consider disabling unnecessary smart card functionalities when not required and maintaining detailed audit logs of all smart card interactions for threat detection purposes. The vulnerability aligns with ATT&CK technique T1550.001 for "Use of Valid Accounts" as attackers could potentially leverage compromised smart card systems to gain elevated privileges, and T1059.001 for "Command and Scripting Interpreter" if the vulnerability leads to code execution capabilities. Regular security assessments of smart card infrastructure and vulnerability scanning of OpenSC deployments should be conducted to identify potential exploitation attempts and ensure proper patch management across all affected systems.