CVE-2021-3972 is a medium-severity vulnerability affecting certain consumer Lenovo Notebook devices. This vulnerability allows an attacker with elevated privileges to modify secure boot settings by manipulating an NVRAM variable due to a driver that was not deactivated during the manufacturing process. The CVSS score for this vulnerability is 6.7, indicating its potential impact on the affected systems.
This vulnerability poses a significant risk as it may allow unauthorized modifications to critical system security settings. Consequently, attackers may potentially bypass security mechanisms that protect the integrity of the system's boot process. Organizations should prioritize addressing this vulnerability to protect their systems from potential exploitation.
As of now, no public exploit has been confirmed, but the existence of a proof of concept on GitHub indicates that the vulnerability could be exploited. Organizations are urged to implement the necessary patches as soon as they become available to mitigate the risk associated with this vulnerability.
Organizations should prioritize patching immediately to safeguard their systems against potential exploitation of this vulnerability. Regular security assessments and keeping firmware updated are essential practices in maintaining a secure environment.
Vulnerability Details
A potential vulnerability by a driver used during the manufacturing process on some consumer Lenovo Notebook devices' BIOS that was mistakenly not deactivated may allow an attacker with elevated privileges to modify secure boot settings by modifying an NVRAM variable.
The CVSS score for CVE-2021-3972 is 6.7, classified as medium severity. This score reflects the vulnerability's potential to impact confidentiality, integrity, and availability, all rated as high.
The affected products include multiple versions of the Lenovo Ideapad series, particularly the firmware associated with models like ideapad_3-14ada05, ideapad_3-15ada6, and others listed in the configurations.
Technical Analysis
The root cause of this vulnerability lies in the inadequate deactivation of a driver used during the manufacturing process of the affected Lenovo devices. The attack vector is local, meaning the attacker needs physical access to the device or the ability to execute code locally.
The attack complexity is classified as low, indicating that exploitation does not require sophisticated skills or extensive resources. The attacker must have high privileges, and no user interaction is required to exploit this vulnerability.
In terms of impact, the vulnerability affects confidentiality, integrity, and availability, all rated as high. This means that successful exploitation could lead to unauthorized access to sensitive data, modification of system settings, and potential downtime or disruption of services.
Risk & Impact Analysis
Risk to organizations includes the potential for unauthorized modifications to secure boot settings, which can compromise the integrity of systems and enable further attacks. The vulnerability's local attack vector means that an attacker would need physical access or local code execution capabilities, but the impact could still be significant.
With a CVSS score of 6.7, organizations should address this vulnerability in their priority patch cycle. Failure to do so may leave systems vulnerable to exploitation, particularly in environments where sensitive data is processed or stored.
The urgency for remediation is medium, given the exploitability and potential impact of this vulnerability. Organizations should ensure they have updated their firmware and security policies to mitigate the risks.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The affected versions include multiple Lenovo Ideapad firmware versions such as ideapad_3-14ada05_firmware, ideapad_3-14ada6_firmware, ideapad_3-15ada6_firmware, and others listed in the configurations.
Mitigation & Remediation
To remediate this vulnerability, organizations should apply the latest firmware updates provided by Lenovo. Regular monitoring for patches and updates is essential. Additionally, implementing strict access controls and monitoring systems for unauthorized changes can help mitigate risks.
For more information on effective security practices, organizations can explore penetration testing to identify vulnerabilities in their systems.
Detection Guidance
Organizations should monitor logs for any unauthorized changes to secure boot settings or NVRAM variables. Behavioral anomalies or unexpected firmware changes should be flagged for further investigation.
AppSecure Threat Intelligence Insight
CVE-2021-3972 highlights the importance of securing firmware and ensuring that manufacturing processes do not leave vulnerabilities exposed. This incident serves as a reminder for organizations to maintain vigilant security practices, including regular audits and updates.
Organizations should consider implementing proactive measures such as penetration testing methodologies to identify and remediate vulnerabilities before they can be exploited.
By understanding the potential impacts of vulnerabilities like CVE-2021-3972, organizations can better prepare their defenses and respond effectively to emerging threats.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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