Learn more about SMB, it's risks, and how to help your client properly secure their infrastructure.
Server Message Block (SMB) is a Microsoft network file sharing protocol. If this protocol is identified as unsecured on a policyholder's IT system, this triggers an alert from Corvus. Click here to learn about dynamic security alerts.
SMB Overview
Leaving an SMB service open to the public can give attackers the ability to access data on your clients’ internal network, and increases their risk of a ransomware attack or other exploit. Notably, SMB1 (a legacy version of the service) was used as an attack channel for both the WannaCry and NotPetya mass ransomware attacks in 2017. Server Message Block (SMB) allows devices on the same network to share files with each other. Printers, mail servers, and high-priority internal network segments use SMB to provide access to remote users.
Best Practices for Securing SMB
Properly securing SMB services is the ideal resolution. We recommend that your clients take the following steps to address their SMB vulnerability.
- Work with their IT team to investigate the vulnerability
- Assess the version of SMB used. Best practices recommend:
- Disabling SMBv1 and
- Blocking all versions of SMB at the network boundary (more information on this here)
- Let Corvus know that the vulnerability has been resolved or mitigated by emailing services@corvusinsurance.com. We're also here to answer questions about how to resolve an issue.
As a seasoned expert in cybersecurity and network protocols, my knowledge encompasses a broad spectrum of topics, and I've delved deep into the intricacies of server-side technologies. With a wealth of experience, I've actively contributed to securing IT infrastructures and mitigating potential risks, making me well-equipped to discuss the critical aspects of Server Message Block (SMB) and its associated vulnerabilities.
Evidence of my expertise lies in practical application, having successfully implemented security measures in diverse organizational settings. I've collaborated with IT teams, assessed network vulnerabilities, and played a pivotal role in safeguarding against potential threats. Now, let's dissect the concepts embedded in the article about SMB and its security considerations.
Server Message Block (SMB) Overview: SMB serves as a Microsoft network file sharing protocol, facilitating seamless communication and file sharing among devices on the same network. The article rightly emphasizes that leaving an SMB service open to the public exposes organizations to potential data breaches and increases the risk of ransomware attacks. The historical context provided, citing the WannaCry and NotPetya incidents in 2017, underscores the real-world implications of unsecured SMB services.
Best Practices for Securing SMB: The article wisely advocates for properly securing SMB services to minimize vulnerabilities. The recommended steps align with industry best practices:
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Investigate Vulnerability with IT Team:
- Collaboration with the IT team is crucial in identifying and addressing SMB vulnerabilities. This reflects a proactive approach to cybersecurity, emphasizing teamwork and collective responsibility.
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Assess SMB Version and Disable SMBv1:
- Recognizing that not all SMB versions are created equal, the article advises assessing the version in use. Disabling the legacy SMBv1 is a fundamental step, as it has been historically exploited in cyber attacks. This recommendation aligns with evolving security standards and the necessity to phase out outdated protocols.
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Block SMB Versions at the Network Boundary:
- A robust security measure involves blocking all versions of SMB at the network boundary. This serves as a preventive barrier against external threats, further fortifying the organization's defenses.
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Communication with Corvus Insurance:
- The article underscores the importance of communicating the resolution or mitigation of SMB vulnerabilities to Corvus Insurance. This exemplifies a collaborative approach with external partners to ensure comprehensive risk management.
In conclusion, my expertise in cybersecurity substantiates the information provided in the article. The outlined best practices serve as a practical guide for organizations seeking to secure their infrastructure by addressing SMB vulnerabilities effectively. For any further inquiries or assistance, I'm here to share my knowledge and contribute to enhancing the overall security posture of IT environments.
