# CVE-2018-14779: libykpiv1: A buffer overflow issue was discovered in the Yubico-Piv 1.5.0 smartcard driver

CVE-2018-14779 is fixed in 3 products on 1 platform, first by libykpiv1 1.4.2-2ubuntu0.1, released August 15, 2018. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2018-14779
- Priority: High
- CVSS: n/a (High)
- EPSS: 0.0049
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 15, 2018

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libykpiv1 Ubuntu 18.04.6 LTS (bionic) | 1.4.2-2ubuntu0.1 | [libykpiv1 1.4.2-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libykpiv1-1.4.2-2ubuntu0.1.md) | Aug 15, 2018 |
| Linux | ykcs11 Ubuntu 18.04.6 LTS (bionic) | 1.4.2-2ubuntu0.1 | [ykcs11 1.4.2-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-ykcs11-1.4.2-2ubuntu0.1.md) | Aug 15, 2018 |
| Linux | yubico-piv-tool Ubuntu 18.04.6 LTS (bionic) | 1.4.2-2ubuntu0.1 | [yubico-piv-tool 1.4.2-2ubuntu0.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-yubico-piv-tool-1.4.2-2ubuntu0.1.md) | Aug 15, 2018 |

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