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CVE-2018-14779

6.8 · MEDIUM

A buffer overflow issue was discovered in the Yubico-Piv 1.5.0 smartcard driver.

Published Aug 15, 2018CWE-119EPSS 0.49%

Overview

CVE-2018-14779 is a medium-severity vulnerability. It was published on August 15, 2018 and has a CVSS 3.0 base score of 6.8 (MEDIUM).

This vulnerability has a CVSS 3.0 base score of 6.8, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refwww.openwall.com/lists/oss-security/2018/08/14/2Refusn.ubuntu.com/4276-1/Refwww.x41-dsec.de/lab/advisories/x41-2018-001-Yubico-Piv/Refwww.yubico.com/support/security-advisories/ysa-2018-03/Refwww.openwall.com/lists/oss-security/2018/08/14/2Refusn.ubuntu.com/4276-1/Refwww.x41-dsec.de/lab/advisories/x41-2018-001-Yubico-Piv/Refwww.yubico.com/support/security-advisories/ysa-2018-03/

How CyberStrike helps

Frequently asked questions

What is CVE-2018-14779?

CVE-2018-14779 is a medium-severity vulnerability. It was published on August 15, 2018 and has a CVSS 3.0 base score of 6.8 (MEDIUM).

How severe is CVE-2018-14779?

This vulnerability has a CVSS 3.0 base score of 6.8, rated MEDIUM. It requires local or adjacent network access to exploit. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2018-14779?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2018-14779?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2018-14779 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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