CVE-2023-21511 Explained : Impact and Mitigation

This CVE, assigned by Samsung Mobile, involves an out-of-bounds read vulnerability in the bc_core trustlet of Samsung Blockchain Keystore versions prior to 1.3.12.1. This vulnerability allows a local attacker to read arbitrary memory.

Understanding CVE-2023-21511

In this section, we will delve deeper into the details of CVE-2023-21511.

What is CVE-2023-21511?

CVE-2023-21511 is an out-of-bounds read vulnerability that occurs during the processing of CMD_COLDWALLET_BTC_SET_PRV_UTXO in the bc_core trustlet of Samsung Blockchain Keystore.

The Impact of CVE-2023-21511

This vulnerability poses a medium-level risk with a CVSS v3.1 base score of 4.4. It can be exploited by a local attacker with high privileges to read arbitrary memory. The confidentiality of the system is at risk, while integrity and availability remain unaffected.

Technical Details of CVE-2023-21511

Here, we will look at the specific technical aspects of CVE-2023-21511.

Vulnerability Description

The vulnerability arises from an out-of-bounds read issue in the processing of a specific command within the bc_core trustlet of Samsung Blockchain Keystore.

Affected Systems and Versions

The impacted system is Samsung Blockchain Keystore with versions earlier than 1.3.12.1. Specifically, the vulnerability affects instances where the version is unspecified or less than 1.3.12.1.

Exploitation Mechanism

An attacker with local access and high privileges can exploit this vulnerability to read arbitrary memory, potentially leading to unauthorized access and data leakage.

Mitigation and Prevention

To mitigate the risks associated with CVE-2023-21511, certain steps can be taken.

Immediate Steps to Take

Upgrade Samsung Blockchain Keystore to version 1.3.12.1 or later to address the vulnerability.
Monitor system activity for any signs of exploitation.
Limit local access permissions to reduce the attack surface for potential threats.

Long-Term Security Practices

Regularly update software and firmware to ensure the latest security patches are applied.
Implement strict access controls and least privilege principles to restrict unauthorized access.
Conduct periodic security assessments and audits to identify and address vulnerabilities proactively.

Patching and Updates

Stay informed about security advisories from Samsung Mobile and promptly apply any patches or updates released to address known vulnerabilities, thereby strengthening the overall security posture of the system.