CVE-2023-4535 : What You Need to Know

This article provides an overview of CVE-2023-4535, highlighting key details, impacts, technical information, and mitigation strategies associated with this vulnerability.

Understanding CVE-2023-4535

The CVE-2023-4535 vulnerability involves an out-of-bounds read in OpenSC packages within the MyEID driver when handling encryption using symmetric keys. This vulnerability has been assigned a CVSS base score of 4.5, indicating a medium severity level.

What is CVE-2023-4535?

An out-of-bounds read vulnerability in OpenSC's MyEID driver allows an attacker physical access to the computer with a specially crafted USB device or smart card. By exploiting this flaw, an attacker can manipulate APDU responses, potentially gaining unauthorized access to sensitive data and compromising the system's security.

The Impact of CVE-2023-4535

The impact of this vulnerability lies in the potential unauthorized access to sensitive data, compromising the security of affected systems. The attacker needs physical access to the computer, limiting the attack surface but still posing significant risks.

Technical Details of CVE-2023-4535

The following technical details provide more insight into the vulnerability:

Vulnerability Description

The vulnerability involves an out-of-bounds read in the MyEID driver of OpenSC packages, allowing attackers to manipulate APDU responses and potentially gain unauthorized access to sensitive data.

Affected Systems and Versions

OpenSC: Version 0.24.0-rc1 is affected.
Red Hat Enterprise Linux 7: The opensc package is affected.
Red Hat Enterprise Linux 9: The opensc package version 0:0.23.0-3.el9_3 is affected.
Fedora: The opensc package is affected.

Exploitation Mechanism

Exploiting this vulnerability requires physical access to the computer and a specially crafted USB device or smart card. By manipulating APDU responses, an attacker can potentially access sensitive data.

Mitigation and Prevention

To address CVE-2023-4535, consider the following mitigation and prevention strategies:

Immediate Steps to Take

Implement access controls to limit physical access to critical systems.
Monitor USB device and smart card usage on systems.
Apply patches and updates provided by the vendors.

Long-Term Security Practices

Conduct regular security assessments and audits.
Educate users on safe USB device and smart card usage.
Implement endpoint security solutions to detect and prevent unauthorized access.

Patching and Updates

Refer to the vendor advisories and URLs provided to access patches and updates for the affected systems and versions. Stay informed about security advisories and apply patches promptly to enhance system security.