Out-of-Bounds The advisory has been revoked - it doesn't affect any version of package yubico-piv-tool (opens in a new tab)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-UBUNTU1910-YUBICOPIVTOOL-650502
- published15 Aug 2018
- disclosed15 Aug 2018
Introduced: 15 Aug 2018
CVE-2018-14779 (opens in a new tab)Amendment
The Ubuntu security team deemed this advisory irrelevant for Ubuntu:19.10.
NVD Description
Note: Versions mentioned in the description apply only to the upstream yubico-piv-tool package and not the yubico-piv-tool package as distributed by Ubuntu.
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
- http://people.ubuntu.com/~ubuntu-security/cve/CVE-2018-14779
- https://www.yubico.com/support/security-advisories/ysa-2018-03/
- https://security-tracker.debian.org/tracker/CVE-2018-14779
- https://www.x41-dsec.de/lab/advisories/x41-2018-001-Yubico-Piv/
- http://www.openwall.com/lists/oss-security/2018/08/14/2
- https://usn.ubuntu.com/4276-1/