UBUNTU-CVE-2018-14780

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UBUNTU-CVE-2018-14780

Summary:

Details: An out-of-bounds read 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_fetch_object()`: {% highlight c %} if(sw == SW_SUCCESS) { size_t outlen; int offs = _ykpiv_get_length(data + 1, &outlen); if(offs == 0) { return YKPIV_SIZE_ERROR; } memmove(data, data + 1 + offs, outlen); *len = outlen; return YKPIV_OK; } else { return YKPIV_GENERIC_ERROR; } {% endhighlight %} -- in the end, a `memmove()` occurs with a length retrieved from APDU data. This length is not checked for whether it is outside of the APDU data retrieved. Therefore the `memmove()` could copy bytes behind the allocated data buffer into this buffer.

References: https://ubuntu.com/security/CVE-2018-14780, 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-2018-14780, https://ubuntu.com/security/notices/USN-4846-1