CVE-2020-24387 : Vulnerability Insights and Analysis

An issue was discovered in the yh_create_session() function of yubihsm-shell through 2.0.2, potentially leading to a denial of service attack.

Understanding CVE-2020-24387

This CVE involves a vulnerability in the yh_create_session() function of yubihsm-shell through version 2.0.2.

What is CVE-2020-24387?

The vulnerability in the yh_create_session() function allows an attacker to trigger out-of-bounds read and write operations in the session array, potentially resulting in a denial of service attack.

The Impact of CVE-2020-24387

Exploitation of this vulnerability could lead to a denial of service attack, impacting the availability of the affected system.

Technical Details of CVE-2020-24387

This section provides more technical insights into the CVE.

Vulnerability Description

The yh_create_session() function in yubihsm-shell through 2.0.2 fails to validate the returned session id, enabling an attacker to manipulate the session array, causing out-of-bounds read and write operations.

Affected Systems and Versions

Product: Not applicable
Vendor: Not applicable
Versions affected: All versions up to 2.0.2

Exploitation Mechanism

An attacker can exploit this vulnerability by providing an invalid session id, leading to unauthorized access and potential denial of service.

Mitigation and Prevention

Protecting systems from CVE-2020-24387 requires immediate actions and long-term security practices.

Immediate Steps to Take

Update yubihsm-shell to a patched version that addresses the vulnerability.
Monitor for any unusual activities that could indicate exploitation of the vulnerability.

Long-Term Security Practices

Regularly update software and firmware to patch known vulnerabilities.
Implement network segmentation to limit the impact of potential attacks.

Patching and Updates

Ensure that all systems running yubihsm-shell are updated to a version beyond 2.0.2 to mitigate the risk of exploitation.