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SUSE: CVE-2018-14779: SUSE Linux Security Advisory

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SUSE: CVE-2018-14779: SUSE Linux Security Advisory

Severity
7
CVSS
(AV:L/AC:L/Au:N/C:C/I:C/A:C)
Published
08/15/2018
Created
03/19/2019
Added
09/06/2018
Modified
10/22/2021

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.

Solution(s)

  • suse-upgrade-libykcs11-1
  • suse-upgrade-libykcs11-devel
  • suse-upgrade-libykpiv-devel
  • suse-upgrade-libykpiv1
  • suse-upgrade-yubico-piv-tool

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