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Published: 15 August 2018

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.

From the Ubuntu security team

It was discovered that libykpiv, a supporting library of the Yubico PIV tool and YubiKey PIV Manager, mishandled specially crafted input. An attacker with a custom-made, malicious USB device could potentially execute arbitrary code on a computer running the Yubico PIV Tool or Yubikey PIV Manager.



CVSS 3 base score: 6.8


Package Release Status
Launchpad, Ubuntu, Debian
Released (1.4.2-2ubuntu0.1)
cosmic Ignored
(reached end-of-life)
disco Ignored
(reached end-of-life)
eoan Not vulnerable
focal Not vulnerable
groovy Not vulnerable
hirsute Not vulnerable
impish Not vulnerable
jammy Not vulnerable
precise Does not exist

trusty Does not exist

Released (1.6.1-1, 1.4.2-2+deb9u1)
xenial Ignored
(end of standard support, was needed)