CVE-2018-14779: Buffer Overflow
First published: Wed Aug 15 2018(Updated: )
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.
Credit: cve@mitre.org cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Yubico Piv Manager | <1.4.2 | |
| Yubico Piv Manager | =1.4.2 | |
| Yubico Piv Manager | =1.4.2b | |
| Yubico Piv Manager | =1.4.2c | |
| Yubico Piv Manager | =1.4.2d | |
| Yubico Piv Manager | =1.4.2e | |
| Yubico Piv Manager | =1.4.2f | |
| Yubico Piv Manager | =1.4.2g | |
| Yubico Piv Tool | <1.6.0 | |
| Yubico Smart Card Minidriver | <=3.7.3.160 | |
| debian/yubico-piv-tool | 2.2.0-1 2.2.0-1.1 2.5.2-1 |
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Reference Links
- http://www.openwall.com/lists/oss-security/2018/08/14/2
- https://usn.ubuntu.com/4276-1/
- https://www.x41-dsec.de/lab/advisories/x41-2018-001-Yubico-Piv/
- https://www.yubico.com/support/security-advisories/ysa-2018-03/
- https://launchpad.net/bugs/cve/CVE-2018-14779
- https://security-tracker.debian.org/tracker/CVE-2018-14779
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2018-14779
- https://nvd.nist.gov/vuln/detail/CVE-2018-14779
- https://ubuntu.com/security/CVE-2018-14779
Frequently Asked Questions
What is the vulnerability ID?
The vulnerability ID is CVE-2018-14779.
What is the severity of CVE-2018-14779?
The severity of CVE-2018-14779 is high with a CVSS score of 6.8.
How does CVE-2018-14779 affect Yubico-Piv?
CVE-2018-14779 affects Yubico-Piv 1.5.0.
How can I mitigate CVE-2018-14779?
To mitigate CVE-2018-14779, update to version 1.4.2-2ubuntu0.1 if you are using Ubuntu, or version 1.6.1-1 or 1.4.2-2+ if you are using a different distribution.
Where can I find more information about CVE-2018-14779?
You can find more information about CVE-2018-14779 at the following links: [link1](http://www.openwall.com/lists/oss-security/2018/08/14/2), [link2](https://usn.ubuntu.com/4276-1/), [link3](https://www.x41-dsec.de/lab/advisories/x41-2018-001-Yubico-Piv/).
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