Instituto Nacional de ciberseguridad. Sección Incibe
Instituto Nacional de Ciberseguridad. Sección INCIBE-CERT

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CVE-2018-14779

Severity CVSS v4.0:
Pending analysis
Type:
CWE-119 Buffer Errors
Publication date:
15/08/2018
Last modified:
17/06/2026

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.

Impact

Vector 3.x
CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS v3.1 Severity and Metrics:

Base Score: 6.80 MEDIUM
Vector: CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector (AV): Physical
Attack Complexity (AC): Low
Privileges Required (PR): None
User Interaction (UI): None
Scope (S): Unchanged
Confidentiality (C): High
Integrity (I): High
Availability (A): High

Base Score 3.x
6.80
Severity 3.x
MEDIUM
Vector 2.0
AV:L/AC:L/Au:N/C:C/I:C/A:C CVSS v2.0 Severity and Metrics:

Base Score: 7.20 HIGH
Vector: AV:L/AC:L/Au:N/C:C/I:C/A:C

Attack Vector (AV): Local
Attack Complexity (AC): Low
Authentication (Au): None
Confidentiality (C): Complete
Integrity (I): Complete
Availability (A): Complete

Base Score 2.0
7.20
Severity 2.0
HIGH

Vulnerable products and versions

CPE From Up to
cpe:2.3:a:yubico:piv_manager:*:*:*:*:*:*:*:* 1.4.2 (excluding)
cpe:2.3:a:yubico:piv_manager:1.4.2:*:*:*:*:*:*:*
cpe:2.3:a:yubico:piv_manager:1.4.2b:*:*:*:*:*:*:*
cpe:2.3:a:yubico:piv_manager:1.4.2c:*:*:*:*:*:*:*
cpe:2.3:a:yubico:piv_manager:1.4.2d:*:*:*:*:*:*:*
cpe:2.3:a:yubico:piv_manager:1.4.2e:*:*:*:*:*:*:*
cpe:2.3:a:yubico:piv_manager:1.4.2f:*:*:*:*:*:*:*
cpe:2.3:a:yubico:piv_manager:1.4.2g:*:*:*:*:*:*:*
cpe:2.3:a:yubico:piv_tool:*:*:*:*:*:*:*:* 1.6.0 (excluding)
cpe:2.3:a:yubico:smart_card_minidriver:*:*:*:*:*:*:*:* 3.7.3.160 (including)

To consult the complete list of CPE names with products and versions, see this page


References to Advisories, Solutions, and Tools