Security issues reported by an AI tool in CCID driver

Very low impact

The reported issues are either not exploitable because the input and output buffers used by PC/SC Lite to call the CCID driver are large enough, or the exploitation requires rogue smart card or smart card reader (i.e. sending non-compliant data).

If you would like to read the details, the issues have been fixed in the following git commits:

• Fix potential buffer overflow

• Fix possible out-of-bounds access

• Check for underflow in SecurePINModify

• Check for short CCID payload

• Fix potential issues in serial driver

• Fix potential buffer overflows

Comments

The AI tool identified real issues.

However, it would be difficult to exploit these issues unless the attacker used a custom-built reader or smart card. This is something I started doing with the Pico HSM project, which is a CCID reader in a Raspberry Pi Pico. This allows you to modify the CCID frames sent by the reader as required.

The bug reports from the AI tool are very verbose. This is useful for impressing a manager with a long, complex-looking text. However, reading the entire report is often a waste of my time. It is often much faster to read the proposed patch to understand the problem it is trying to fix.

The proposed fixes are, sometimes, incorrect. They are a good starting point, though. However, never apply an AI-generated patch without fully understanding it.

Conclusion

Thanks to Red Hat and Jakub Jelen for the bug reports.

I am very happy that the AI tool only identified issues with no or low impact.