CVE-2020-26572

opensc: stack-based buffer overflow in tcos_decipher

Severity Score

5.5

*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

*Multiple Sources

Exploited in Wild

*KEV

Decision

*SSVC

Descriptions

The TCOS smart card software driver in OpenSC before 0.21.0-rc1 has a stack-based buffer overflow in tcos_decipher.

El controlador de software de la tarjeta inteligente TCOS en OpenSC versiones anteriores a 0.21.0-rc1, presenta un desbordamiento en la región stack de la memoria en la función tcos_decipher

*Credits: N/A

CVSS Scores

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Attack Vector

Physical

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Attack Vector

Local

Attack Complexity

Low

Authentication

None

Confidentiality

None

Integrity

None

Availability

Partial

* Common Vulnerability Scoring System

SSVC

Decision:-

Exploitation

Automatable

Tech. Impact

* Organization's Worst-case Scenario

Timeline

2020-10-06 CVE Reserved
2020-10-06 CVE Published
2023-03-08 EPSS Updated
2024-08-04 CVE Updated
---------- Exploited in Wild
---------- KEV Due Date
---------- First Exploit

CWE

CWE-787: Out-of-bounds Write

CAPEC

References (7)

URL	Tag	Source
http://www.openwall.com/lists/oss-security/2020/11/24/4	Mailing List
https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=22967	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/11/msg00027.html	Mailing List

URL	Date	SRC

URL	Date	SRC
https://github.com/OpenSC/OpenSC/commit/9d294de90d1cc66956389856e60b6944b27b4817	2023-11-07

URL	Date	SRC
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/EXOHFDMNMO6IDECAGUTB3SJGAGXVRT6S	2023-11-07
https://access.redhat.com/security/cve/CVE-2020-26572	2021-05-18
https://bugzilla.redhat.com/show_bug.cgi?id=1885954	2021-05-18

Affected Vendors, Products, and Versions

Vendor		Product				Version		Other		Status
Vendor	Product	Version	Other	Status	<-- -->	Vendor	Product	Version	Other	Status
Opensc Project Search vendor "Opensc Project"		Opensc Search vendor "Opensc Project" for product "Opensc"				<= 0.20.0 Search vendor "Opensc Project" for product "Opensc" and version " <= 0.20.0"		-		Affected
Fedoraproject Search vendor "Fedoraproject"		Fedora Search vendor "Fedoraproject" for product "Fedora"				33 Search vendor "Fedoraproject" for product "Fedora" and version "33"		-		Affected
Debian Search vendor "Debian"		Debian Linux Search vendor "Debian" for product "Debian Linux"				9.0 Search vendor "Debian" for product "Debian Linux" and version "9.0"		-		Affected