CVE-2023-21508 : Security Advisory and Response

This CVE was recently published on May 4, 2023, by Samsung Mobile. It involves an Out-of-bounds Write vulnerability in the bc_tui trustlet from Samsung Blockchain Keystore before version 1.3.12.1.

Understanding CVE-2023-21508

This section will provide insights into what CVE-2023-21508 entails, its impact, technical details, and how to mitigate and prevent potential attacks.

What is CVE-2023-21508?

CVE-2023-21508 refers to an Out-of-bounds Write vulnerability found in the bc_tui trustlet component of Samsung Blockchain Keystore. This flaw can be exploited by a local attacker to execute arbitrary code.

The Impact of CVE-2023-21508

The vulnerability poses a significant risk as it allows a local attacker to execute arbitrary code, potentially leading to unauthorized access, data manipulation, and system compromise. It has a base severity rating of MEDIUM on the CVSSv3.1 scale.

Technical Details of CVE-2023-21508

This section will delve into the specific technical aspects of CVE-2023-21508, including the vulnerability description, affected systems, and the exploitation mechanism.

Vulnerability Description

The Out-of-bounds Write vulnerability arises while processing the BC_TUI_CMD_SEND_RESOURCE_DATA command in the bc_tui trustlet from Samsung Blockchain Keystore before version 1.3.12.1. This flaw allows a local attacker to execute arbitrary code on the affected system.

Affected Systems and Versions

The vulnerability impacts Samsung Blockchain Keystore versions prior to 1.3.12.1. Systems with this version or earlier are susceptible to exploitation if the necessary conditions are met.

Exploitation Mechanism

The exploitation of this vulnerability involves leveraging the Out-of-bounds Write flaw in the specified command processing mechanism within the bc_tui trustlet. By manipulating certain inputs, an attacker could execute unauthorized code.

Mitigation and Prevention

To safeguard systems against CVE-2023-21508, it is crucial to implement immediate and long-term security measures to mitigate the risk of exploitation.

Immediate Steps to Take

Update Samsung Blockchain Keystore to version 1.3.12.1 or above to eliminate the vulnerability.
Monitor system activity for any signs of unauthorized code execution or suspicious behavior.

Long-Term Security Practices

Regularly update software and apply security patches to address known vulnerabilities promptly.
Conduct routine security audits and assessments to identify and remediate potential weaknesses in the system.

Patching and Updates

Stay informed about security advisories from Samsung Mobile and other relevant sources to stay up-to-date on patches and updates related to Samsung Blockchain Keystore. Regularly check for new releases and apply them as soon as they are available to enhance system security.