CVE-2018-14779

Severity Score

6.8

*CVSS v3

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

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.

Se ha descubierto una vulnerabilidad de desbordamiento de búfer en el controlador de tarjetas inteligentes de Yubico-Piv 1.5.0. El archivo lib/ykpiv.c contiene el siguiente código en la función "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 %} -- Se comprueba claramente si el búfer es lo suficientemente grande para contener los datos copiados usando "memcpy()", pero no se manejan los errores para evitar el "memcpy()" en estos casos. Esta ruta de código se puede desencadenar con datos maliciosos provenientes de una tarjeta inteligente.

*Credits: N/A

Attack Vector

Physical

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

Complete

Integrity

Complete

Availability

Complete

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2018-08-01 CVE Reserved
2018-08-14 CVE Published
2023-08-09 EPSS Updated
2024-08-05 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-119: Improper Restriction of Operations within the Bounds of a Memory Buffer
CWE-787: Out-of-bounds Write

CAPEC

References (4)

URL	Tag	Source
http://www.openwall.com/lists/oss-security/2018/08/14/2	Mailing List
https://www.x41-dsec.de/lab/advisories/x41-2018-001-Yubico-Piv	Third Party Advisory

URL	Date	SRC

URL	Date	SRC

URL	Date	SRC
https://usn.ubuntu.com/4276-1	2020-02-25
https://www.yubico.com/support/security-advisories/ysa-2018-03	2020-02-25

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Yubico Search vendor "Yubico"		Piv Manager Search vendor "Yubico" for product "Piv Manager"				< 1.4.2 Search vendor "Yubico" for product "Piv Manager" and version " < 1.4.2"		-		Affected
Yubico Search vendor "Yubico"		Piv Manager Search vendor "Yubico" for product "Piv Manager"				1.4.2 Search vendor "Yubico" for product "Piv Manager" and version "1.4.2"		-		Affected
Yubico Search vendor "Yubico"		Piv Manager Search vendor "Yubico" for product "Piv Manager"				1.4.2b Search vendor "Yubico" for product "Piv Manager" and version "1.4.2b"		-		Affected
Yubico Search vendor "Yubico"		Piv Manager Search vendor "Yubico" for product "Piv Manager"				1.4.2c Search vendor "Yubico" for product "Piv Manager" and version "1.4.2c"		-		Affected
Yubico Search vendor "Yubico"		Piv Manager Search vendor "Yubico" for product "Piv Manager"				1.4.2d Search vendor "Yubico" for product "Piv Manager" and version "1.4.2d"		-		Affected
Yubico Search vendor "Yubico"		Piv Manager Search vendor "Yubico" for product "Piv Manager"				1.4.2e Search vendor "Yubico" for product "Piv Manager" and version "1.4.2e"		-		Affected
Yubico Search vendor "Yubico"		Piv Manager Search vendor "Yubico" for product "Piv Manager"				1.4.2f Search vendor "Yubico" for product "Piv Manager" and version "1.4.2f"		-		Affected
Yubico Search vendor "Yubico"		Piv Manager Search vendor "Yubico" for product "Piv Manager"				1.4.2g Search vendor "Yubico" for product "Piv Manager" and version "1.4.2g"		-		Affected
Yubico Search vendor "Yubico"		Piv Tool Search vendor "Yubico" for product "Piv Tool"				< 1.6.0 Search vendor "Yubico" for product "Piv Tool" and version " < 1.6.0"		-		Affected
Yubico Search vendor "Yubico"		Smart Card Minidriver Search vendor "Yubico" for product "Smart Card Minidriver"				<= 3.7.3.160 Search vendor "Yubico" for product "Smart Card Minidriver" and version " <= 3.7.3.160"		-		Affected