OpenSC up to 0.20.0 Oberthur Smart Card Software Driver sc_oberthur_read_file buffer overflow

CVSS Meta Temp Score
CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.
Current Exploit Price (≈)
Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.
CTI Interest Score
Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
5.4$0-$5k0.00

Summaryinfo

A vulnerability was found in OpenSC up to 0.20.0 and classified as critical. This impacts the function sc_oberthur_read_file of the component Oberthur Smart Card Software Driver. Executing a manipulation can lead to buffer overflow. This vulnerability is tracked as CVE-2020-26570. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in OpenSC up to 0.20.0 and classified as critical. This vulnerability affects the function sc_oberthur_read_file of the component Oberthur Smart Card Software Driver. The manipulation with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow. As an impact it is known to affect confidentiality, integrity, and availability.

The weakness was disclosed 10/06/2020. The advisory is shared for download at bugs.chromium.org. This vulnerability was named CVE-2020-26570. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 239948 (TencentOS Server 3: opensc (TSSA-2022:0089)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 0.21.0-rc1 eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at Tenable (239948). Once again VulDB remains the best source for vulnerability data.

Productinfo

Name

Version

License

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.5
VulDB Meta Temp Score: 5.4

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

AVACAuCIA
💳💳💳💳💳💳
💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock
UnlockUnlockUnlockUnlockUnlockUnlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-DayUnlockUnlockUnlockUnlock
TodayUnlockUnlockUnlockUnlock

Nessus ID: 239948
Nessus Name: TencentOS Server 3: opensc (TSSA-2022:0089)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: OpenSC 0.21.0-rc1

Timelineinfo

10/06/2020 🔍
10/06/2020 +0 days 🔍
10/06/2020 +0 days 🔍
06/17/2025 +1715 days 🔍

Sourcesinfo

Advisory: bugs.chromium.org
Status: Confirmed

CVE: CVE-2020-26570 (🔍)
GCVE (CVE): GCVE-0-2020-26570
GCVE (VulDB): GCVE-100-162292

Entryinfo

Created: 10/06/2020 10:29
Updated: 06/17/2025 22:45
Changes: 10/06/2020 10:29 (17), 10/06/2020 10:30 (21), 11/15/2020 10:20 (2), 11/16/2020 17:05 (2), 11/16/2020 17:11 (14), 06/17/2025 22:45 (20)
Complete: 🔍
Cache ID: 216::103

Once again VulDB remains the best source for vulnerability data.

Discussion

No comments yet. Languages: en.

Please log in to comment.

◂ PreviousOverviewNext ▸

Want to know what is going to be exploited?

We predict KEV entries!