CVE-2023-40661 in OpenSC
Summary
by MITRE • 11/06/2023
Several memory vulnerabilities were identified within the OpenSC packages, particularly in the card enrollment process using pkcs15-init when a user or administrator enrolls cards. To take advantage of these flaws, an attacker must have physical access to the computer system and employ a custom-crafted USB device or smart card to manipulate responses to APDUs. This manipulation can potentially allow compromise key generation, certificate loading, and other card management operations during enrollment.
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Analysis
by VulDB Data Team • 12/28/2024
The vulnerability described in CVE-2023-40661 represents a significant security risk within the OpenSC framework, specifically targeting the card enrollment process through the pkcs15-init utility. This flaw exists within the cryptographic token management system that governs how smart cards and USB security tokens are provisioned and configured. The OpenSC project serves as a critical component in many enterprise security infrastructures, providing open source implementations of pkcs#11 and other cryptographic standards that enable secure authentication and key management across various platforms and applications. The vulnerability's impact is particularly concerning because it directly affects the initial card enrollment phase where sensitive cryptographic keys and certificates are generated and stored, making it a prime target for attackers seeking to compromise the security of authenticated systems.
The technical nature of this vulnerability stems from memory handling issues that occur during the processing of application protocol data units (APDUs) within the card enrollment workflow. Attackers exploiting this flaw must possess physical access to the target system and must be able to manipulate the communication between the smart card reader and the system through a specially crafted USB device or smart card. This attack vector aligns with the ATT&CK technique T1059.001 for execution through command and scripting interpreter, and T1021.002 for remote services through smb/windows admin shares, as it leverages direct hardware manipulation to bypass traditional network-based security controls. The memory vulnerabilities specifically manifest as potential buffer overflows or memory corruption issues that could occur when the pkcs15-init utility processes malformed responses from smart card devices during enrollment operations, creating opportunities for arbitrary code execution or information disclosure.
The operational impact of CVE-2023-40661 extends beyond simple privilege escalation or data theft, as it fundamentally undermines the security of the entire card enrollment process. When an attacker successfully exploits this vulnerability during card enrollment, they can potentially compromise key generation processes, manipulate certificate loading procedures, and interfere with other critical card management operations that establish the foundation for secure authentication within enterprise environments. This vulnerability particularly affects systems where OpenSC is used for smart card-based authentication, such as government agencies, financial institutions, and enterprise networks that rely on hardware security modules for identity management. The attack requires physical proximity but does not necessitate network access, making it particularly dangerous in environments where physical security controls are insufficient or where insider threats exist, as the attack can be executed without raising network-based security alerts or intrusion detection system warnings.
Mitigation strategies for CVE-2023-40661 should focus on both immediate patching and operational security improvements. Organizations must prioritize updating their OpenSC packages to versions that address the identified memory vulnerabilities, which typically involves upgrading to patched releases that include proper bounds checking and memory management controls. The CWE classification for this vulnerability would likely fall under CWE-121 for stack-based buffer overflow or CWE-122 for heap-based buffer overflow, depending on the specific memory corruption mechanism. Additionally, operational controls should include implementing physical security measures such as restricting access to systems with smart card readers, deploying device whitelisting solutions, and establishing strict procedures for card enrollment processes that require multiple levels of authentication and verification. Security monitoring should be enhanced to detect unusual patterns in smart card communication and enrollment activities, as well as implementing network segmentation to limit the potential lateral movement if an attacker successfully compromises a single system. The vulnerability also highlights the importance of supply chain security, as the attack vector involves custom-crafted hardware that could potentially be introduced through trusted vendors or compromised manufacturing processes, requiring organizations to implement hardware integrity verification measures and maintain strict inventory controls over all smart card and USB device components used in their security infrastructure.