CVE-2020-26570

opensc: heap-based buffer overflow in sc_oberthur_read_file

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 Oberthur smart card software driver in OpenSC before 0.21.0-rc1 has a heap-based buffer overflow in sc_oberthur_read_file.

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

An update that fixes 8 vulnerabilities is now available. This update for opensc fixes the following issues. Fixed an out-of-bounds access of an ASN.1 Bitstring in decode_bit_string. Fixed an out-of-bounds access of an ASN.1 Octet string in asn1_decode_entry. Fixed an incorrect read operation during parsing of a SETCOS file attribute. Fixed an improper free operation in sc_pkcs15_decode_prkdf_entry. Fixed a double free in coolkey_free_private_data. Fixed a buffer overflow in sc_oberthur_read_file. Fixed a stack-based buffer overflow in gemsafe GPK smart card software driver. Fixed a stack-based buffer overflow in tcos_decipher. This update was imported from the SUSE:SLE-15-SP1:Update update project.

*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
2024-08-04 CVE Updated
2025-05-28 EPSS 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=24316	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/6903aebfddc466d966c7b865fae34572bf3ed23e	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-2020-26570	2021-05-18
https://bugzilla.redhat.com/show_bug.cgi?id=1885947	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