CVE-2021-3969 : Exploit Details and Defense Strategies

A Time of Check Time of Use (TOCTOU) vulnerability was reported in IMController, a software component of Lenovo System Interface Foundation, prior to version 1.1.20.3 that could allow a local attacker to elevate privileges.

Understanding CVE-2021-3969

This section provides insights into the CVE-2021-3969 vulnerability affecting Lenovo's IMController.

What is CVE-2021-3969?

CVE-2021-3969 is a Time of Check Time of Use (TOCTOU) vulnerability in Lenovo's IMController software component, allowing local attackers to escalate their privileges.

The Impact of CVE-2021-3969

The vulnerability has a CVSS base score of 7.8, categorizing it as HIGH severity due to its potential for high confidentiality, integrity, and availability impact.

Technical Details of CVE-2021-3969

This section elaborates on the technical aspects of CVE-2021-3969.

Vulnerability Description

The vulnerability arises from a Time of Check Time of Use (TOCTOU) flaw in IMController, enabling attackers to exploit privilege escalation.

Affected Systems and Versions

Lenovo's IMController versions prior to 1.1.20.3 are affected, making them susceptible to this privilege escalation vulnerability.

Exploitation Mechanism

Local attackers can leverage this vulnerability in IMController to elevate their privileges within the system.

Mitigation and Prevention

Learn how to mitigate and prevent the CVE-2021-3969 vulnerability.

Immediate Steps to Take

Users should update the IMController component of Lenovo System Interface Foundation to version 1.1.20.3 to prevent exploitation. Refer to LEN-75210 for detailed mitigation guidance.

Long-Term Security Practices

Maintain regular software updates and security monitoring to prevent potential privilege escalation attacks.

Patching and Updates

Stay informed about security patches and updates released by Lenovo to address vulnerabilities like CVE-2021-3969.