CVE-2024-45617

What it actually does

Missing or insufficient checks on return values from APDU handling functions in OpenSC allow use of uninitialized variables when a crafted smart card or USB device supplies unexpected responses.

Why it matters to the business

Physical attackers with access to card readers can trigger limited integrity or confidentiality effects on systems relying on OpenSC for cryptographic operations, though remote exploitation is not possible.

How an attack unfolds

An attacker presents a malicious smart card or USB device that responds to APDUs in a way that bypasses return-value validation, causing the library to operate on uninitialized memory and produce unexpected results during PKCS#11 or minidriver operations.

How to fix it

Upgrade OpenSC to the commit fe857cc4c68da4873071f168c9aaf9860040ff4e or later; rebuild and redeploy any dependent packages or images that embed the vulnerable library.

How to confirm the fix worked

Confirm the installed OpenSC binary or library reports a build containing commit fe857cc4c68da4873071f168c9aaf9860040ff4e; perform regression testing with malformed APDU responses to verify proper error handling.

Typical attack path

1. Obtain physical access to a system with an OpenSC-enabled smart card reader
2. Insert a crafted USB device or smart card
3. Trigger APDU exchanges that return unexpected values
4. Exploit missing return-value checks to operate on uninitialized variables
5. Achieve limited local impact on cryptographic state or data handling

How to detect it

Review system and application logs for unexpected APDU handling errors or crashes involving OpenSC components; correlate with physical access events to smart card readers.

What your security team should do

• Apply the fixed commit fe857cc4c68da4873071f168c9aaf9860040ff4e across all OpenSC deployments immediately
• Restrict physical access to systems and readers that accept smart cards or tokens
• Audit and replace any downstream packages that bundle older OpenSC versions