CVE-2024-45616

What it actually does

Insufficient bounds checking on APDU response buffers returned by smart cards or USB tokens allows memory corruption in the OpenSC PKCS#11 module, minidriver, and related tools when processing crafted card responses.

Why it matters to the business

Organizations relying on smart-card or hardware-token authentication face risk of local memory corruption that could lead to credential theft or system instability when an attacker gains physical access to insert a malicious card or device.

How an attack unfolds

An attacker with physical access prepares a USB device or smart card that returns specially crafted APDU responses; when OpenSC sends APDUs and receives the malicious replies, the lack of proper buffer-length validation triggers memory corruption that an attacker can leverage for limited read/write or denial-of-service effects.

How to fix it

Upgrade OpenSC to the commit fe857cc4c68da4873071f168c9aaf9860040ff4e or later; rebuild and redeploy all dependent PKCS#11 modules, minidrivers, and CTK components; verify that the updated libraries are loaded by applications using smart-card authentication.

How to confirm the fix worked

Confirm the installed OpenSC binary or library reports a version containing commit fe857cc4c68da4873071f168c9aaf9860040ff4e; run regression tests with both benign and boundary-case APDU responses to verify buffer handling.

Typical attack path

1. Obtain physical access to a system with OpenSC installed and a smart-card reader
2. Insert a USB device or smart card engineered to reply with malicious APDU data
3. Trigger OpenSC library or tool communication with the card
4. Exploit resulting memory corruption to read or alter process memory

How to detect it

Review system logs and application traces for unexpected APDU response lengths or memory-allocation failures immediately after card insertion; correlate with physical-access logs to identify unauthorized card-present events.

What your security team should do

• Apply the fixed commit immediately on all systems that use OpenSC for hardware-token authentication
• Restrict physical access to workstations and servers equipped with smart-card readers
• Audit application dependency trees to ensure no older OpenSC builds remain in use
• Monitor vendor advisories for any additional downstream packages that embed OpenSC