Outbreak Alert
Targeted by HAFNIUM
Firstly, if you are running an un-patched on-premise Microsoft Exchange version, you should upgrade immediately! This is a critical vulnerability that allows an attacker to access a desired user’s mailbox, requiring only the e-mail address of the user they wish to target! These details and more were disclosed by Volexity here. https://www.volexity.com/blog/2021/03/02/active-exploitation-of-microsoft-exchange-zero-day-vulnerabilities/ The vulnerabilities affect Exchange Server 2013, 2016 and 2019. Exchange Online is not affected. Learn More »
Common Vulnerabilities and Exposures
Background
In the article above, Volexity disclosed seeing these exploits as early as January 3, 2021. The first CVE discovered was CVE-2021-26855 being used to steal content from mailboxes. On further monitoring of the environments, it was observed the attacker can chain this vulnerability to others (including CVE-2021-27065), enabling remote code execution, and eventually lateral movement. More details are available from Volexity’s post.
Threat Radar Overall Score:
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CVSS Rating | 9.0 |
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FortiRecon Score | 92/100 |
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Known Exploited | Yes |
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Exploit Prediction Score | 97.51% |
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FortiGuard Telemetry | 2 |
Latest Development
Recent news and incidents related to cybersecurity threats encompassing various events such as data breaches, cyber-attacks, security incidents, and vulnerabilities discovered.
On March 2, 2020, Microsoft released the patches via MSRC:
https://msrc-blog.microsoft.com/2021/03/02/multiple-security-updates-released-for-exchange-server/
On March 5, Microsoft released additional details and mitigation techniques that can be used by customers unable to upgrade quickly:
https://msrc-blog.microsoft.com/2021/03/05/microsoft-exchange-server-vulnerabilities-mitigations-march-2021/
Microsoft published further information about nation-state attacks, and identified HAFNIUM specifically as the primary threat actor exploiting these vulnerabilities:
https://msrc-blog.microsoft.com/2021/03/02/multiple-security-updates-released-for-exchange-server/https://blogs.microsoft.com/on-the-issues/2021/03/02/new-nation-state-cyberattacks/https://www.microsoft.com/security/blog/2021/03/02/hafnium-targeting-exchange-servers/
On March 11, Microsoft announced detection of a new variant of DearCry ransomware was being used on vulnerable Exchange servers:
https://twitter.com/MsftSecIntel/status/1370236539427459076
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Threat Intelligence
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References
Sources of information in support and relation to this Outbreak and vendor.