CVE-2021-36305 : What You Need to Know
Learn about CVE-2021-36305, a Dell PowerScale OneFS vulnerability enabling unsynchronized data access in an SMB CA context, potentially leading to denial of service exploits. Find mitigation steps and affected versions here.
Dell PowerScale OneFS contains a vulnerability that allows unsynchronized access to shared data in a multithreaded context in SMB CA handling. This could lead to a denial of service, affecting versions 8.2.0, 8.2.1, 9.0.0.x, 9.2.0.x, 9.1.1.x, 8.2.2, 9.1.0.x, and 9.2.1.x.
Understanding CVE-2021-36305
This section will provide insights into the nature and impact of the CVE-2021-36305 vulnerability.
What is CVE-2021-36305?
CVE-2021-36305 refers to a vulnerability in Dell PowerScale OneFS that allows for unsynchronized access to shared data in an SMB CA multithreaded context. An authenticated user exploiting this could trigger a denial of service over SMB.
The Impact of CVE-2021-36305
The vulnerability's impact is rated as medium severity, with a CVSS base score of 6.5. It can lead to a denial of service over SMB in affected systems.
Technical Details of CVE-2021-36305
This section delves into the technical aspects of the CVE-2021-36305 vulnerability.
Vulnerability Description
The vulnerability in Dell PowerScale OneFS allows an authenticated user of SMB on a CA cluster to exploit unsynchronized access to shared data, potentially resulting in a denial of service over SMB.
Affected Systems and Versions
The vulnerability affects Dell PowerScale OneFS versions 8.2.0, 8.2.1, 9.0.0.x, 9.2.0.x, 9.1.1.x, 8.2.2, 9.1.0.x, and 9.2.1.x.
Exploitation Mechanism
An attacker needs to be authenticated as an SMB user on a cluster with CA to exploit the unsynchronized data access vulnerability.
Mitigation and Prevention
This section outlines the steps to mitigate and prevent potential exploitation of CVE-2021-36305.
Immediate Steps to Take
Users are advised to apply patches provided by Dell for the affected PowerScale OneFS versions. Additionally, monitoring SMB traffic for anomalous behavior can help detect exploitation attempts.
Long-Term Security Practices
Implementing network segmentation, user access controls, and regular security audits can enhance the overall security posture of the environment.
Patching and Updates
Regularly update and patch Dell PowerScale OneFS to address known vulnerabilities and enhance the system's resilience against potential threats.