CVE-2021-21551 is a high-severity vulnerability found in the Dell dbutil_2_3.sys driver. This vulnerability allows local authenticated users to exploit insufficient access controls, leading to potential escalation of privileges, denial of service, or information disclosure. The CVSS score for this vulnerability is 8.8, indicating a significant risk to affected systems. Organizations using the impacted driver should prioritize patching to mitigate these risks.
The vulnerability was published on May 4, 2021, and has been classified as CVE-2021-21551. It specifically affects local users who have authenticated access. Organizations should be aware of the critical nature of this vulnerability and take necessary actions.
Given the CVSS score and the potential impact on confidentiality, integrity, and availability, organizations utilizing affected Dell products must act swiftly to apply the necessary patches. Failure to address this vulnerability could expose systems to exploitation and unauthorized access.
Organizations should prioritize patching immediately. The following sections will delineate the specific details regarding the vulnerability, technical analysis, risk analysis, and recommended mitigation strategies.
Vulnerability Details
This vulnerability stems from the insufficient access control in the Dell dbutil_2_3.sys driver. The official CVE description highlights that a local authenticated user can exploit the vulnerability to escalate their privileges or compromise system integrity, resulting in denial of service or unauthorized information disclosure.
The CVSS 3.1 base score assigned to this vulnerability is 8.8, with the following vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H. This indicates a local attack vector, with low complexity, requiring low privileges and no user interaction while impacting confidentiality, integrity, and availability significantly.
The vulnerability was disclosed on May 4, 2021, and falls under the CWE classification of CWE-782: Insufficient Access Control.
Technical Analysis
The root cause of CVE-2021-21551 is attributed to the insufficient access control within the dbutil_2_3.sys driver. This flaw permits local authenticated users to exploit the driver, potentially allowing them to escalate their privileges to system level. The attack vector is local, meaning that an attacker would need to have local access to the system.
The attack complexity is classified as low, indicating that the steps required to exploit this vulnerability are not particularly difficult. Privileges required for exploitation are also low, as an attacker only needs local authenticated access. No user interaction is necessary for the attack to succeed.
In terms of impacts, the confidentiality, integrity, and availability of systems are all rated as high. This means that successful exploitation could lead to unauthorized access to sensitive information, modification of critical data, or a complete denial of service.
Risk & Impact Analysis
The risk to organizations includes the potential for significant operational disruption, unauthorized access to sensitive information, and the possibility of further attacks leveraging the compromised systems. The blast radius of this vulnerability is extensive, as it affects a wide range of Dell products, making it a critical concern for many organizations.
Given the CVSS score and the fact that this vulnerability has been included in the Known Exploited Vulnerabilities (KEV) catalog, organizations should address this vulnerability in their priority patch cycle. The urgency to remediate is high, particularly for those with systems that utilize the affected Dell drivers.
Exploitation Status
Signal | Status |
|---|---|
Known Exploit | Yes |
Public PoC | Yes |
Actively Exploited | Yes |
Ransomware Use | No |
Affected Versions
The vulnerability affects all versions of the Dell dbutil driver prior to vendor patch. Organizations should ensure that they are running the latest updated versions of this driver.
Mitigation & Remediation
To mitigate the risks associated with CVE-2021-21551, organizations should apply the latest patches released by Dell as outlined in the vendor advisory. For those unable to immediately apply the patches, implementing strict access controls and monitoring for unusual activity related to the dbutil driver can help reduce risk.
For more comprehensive security validation, organizations may consider utilizing penetration testing to identify any similar vulnerabilities.
Detection Guidance
Organizations should monitor logs for indicators of exploitation attempts related to the dbutil driver, including unusual access patterns or unauthorized privilege escalations. Behavioral anomalies should also be scrutinized to detect any potential exploitation.
AppSecure Threat Intelligence Insight
CVE-2021-21551 exemplifies vulnerabilities that, while initially appearing contained, can lead to broader systemic risks if not addressed promptly. The presence of public exploits and its inclusion in the KEV catalog signal a growing concern that security teams must address proactively.
This incident underscores the necessity for a robust vulnerability management program, as well as regular security assessments. Organizations are encouraged to refer to resources on designing effective vulnerability management programs as a preventative measure against future vulnerabilities.
Additionally, security teams should remain vigilant about emerging threats and consider engaging in cloud penetration testing to explore the effectiveness of their defenses against vulnerabilities.
Finally, the threat landscape is ever-evolving, and organizations should adapt their security posture accordingly. Engaging in penetration testing methodologies can provide valuable insights and bolster defenses against potential exploits.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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