Out-of-bounds Read in Yubico Piv Manager
CVE-2018-14780
An out-of-bounds read 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_fetch_object()`: {% highlight c %} if(sw == SW_SUCCESS) { size_t outlen; int offs = _ykpiv_get_length(data + 1, &outlen); if(offs == 0) { return YKPIV_SIZE_ERROR; } memmove(data, data + 1 + offs, outlen); *len = outlen; return YKPIV_OK; } else { return YKPIV_GENERIC_ERROR; } {% endhighlight %} -- in the end, a `memmove()` occurs with a length retrieved from APDU data. This length is not checked for whether it is outside of the APDU data retrieved. Therefore the `memmove()` could copy bytes behind the allocated data buffer into this buffer.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 4.6 (Medium). Vector: CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.
EPSS exploit prediction
EPSS: 0.004 (36.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 36.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Yubico Piv Manager — versions 1.4.2, 1.4.2b, 1.4.2c
- Yubico Piv Tool
- Yubico Smart Card Minidriver
Weakness classification (CWE)
References
- www.yubico.com/support/security-advisories/ysa-2018-03/ (Vendor Advisory)
- www.x41-dsec.de/lab/advisories/x41-2018-001-Yubico-Piv/ (Third Party Advisory)
- www.openwall.com/lists/oss-security/2018/08/14/2 (mailing-list, Mailing List, Third Party Advisory)
- usn.ubuntu.com/4276-1/ (vendor-advisory)
Frequently asked questions
- What is CVE-2018-14780?
- CVE-2018-14780 is a medium-severity vulnerability in Yubico Piv Manager, classified under Out-of-bounds Read. CVSS score: 4.6/10. Published 2018-08-15.
- How severe is CVE-2018-14780?
- Medium severity. CVSS v3 base score is 4.6 out of 10.