UBUNTU-CVE-2018-14779

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UBUNTU-CVE-2018-14779

Summary:

Details: A buffer overflow issue was discovered in the Yubico-Piv 1.5.0 smartcard driver. The file lib/ykpiv.c contains the following code in the function `ykpiv_transfer_data()`: {% highlight c %} if(*out_len + recv_len - 2 > max_out) { fprintf(stderr, "Output buffer to small, wanted to write %lu, max was %lu.", *out_len + recv_len - 2, max_out); } if(out_data) { memcpy(out_data, data, recv_len - 2); out_data += recv_len - 2; *out_len += recv_len - 2; } {% endhighlight %} -- it is clearly checked whether the buffer is big enough to hold the data copied using `memcpy()`, but no error handling happens to avoid the `memcpy()` in such cases. This code path can be triggered with malicious data coming from a smartcard.

References: https://ubuntu.com/security/CVE-2018-14779, https://www.x41-dsec.de/lab/advisories/x41-2018-001-Yubico-Piv/, https://ubuntu.com/security/notices/USN-4276-1, https://www.cve.org/CVERecord?id=CVE-2018-14779, https://ubuntu.com/security/notices/USN-4846-1