“We’ve said it before, we’re saying it now, and we’ll keeping saying it: It is critical to keep your Exchange servers updated.” Microsoft is reminding admins once again not only to stay current on the latest Cumulative Update (CU) and Security Update (SU) on all Exchange servers, but to also perform manual tasks to harden [...]
Microsoft has released Security Updates (SUs) for vulnerabilities found in: Exchange Server 2013 Exchange Server 2016 Exchange Server 2019 The updates address the following vulnerabilities: CVE-2023-21745: Spoofing Vulnerability CVE-2023-21761: Information Disclosure Vulnerability CVE-2023-21762: Spoofing Vulnerability CVE-2023-21763: Elevation of Privilege Vulnerability CVE-2023-21764: Elevation of Privilege Vulnerability Official announcement can be found here. SUs are available for [...]
Threat actors affiliated with the Play ransomware strain are leveraging a never-before-seen exploit method that bypasses Microsoft’s ProxyNotShell URL rewrite mitigation. A New Exploit Chain CrowdStrike researchers have discovered a new exploit method they have named OWASSRF, or Outlook Web Access Server-Side Request Forgery. The novel exploit affects Exchange Server 2013, 2016 and 2019 by leveraging CVE-2022-41080 [...]
ProxyShell and ProxyLogon are two high severity exploits against Microsoft Exchange Servers discovered in 2021. Both vulnerabilities enable threat actors to perform remote code execution on vulnerable systems. A year later, another easily exploitable vulnerability named ProxyNotShell is threatening unpatched Exchange Servers. Here's a great article we recommend you read: Microsoft Exchange ProxyNotShell vulnerability explained [...]
Security researchers confirm Proof-of-Concept (PoC) works against unpatched versions of Microsoft Exchange Server 2013, 2016 and 2019 In early August, researchers discovered cyberattacks against critical infrastructure using two unpublished Exchange Server security vulnerabilities. Microsoft’s Security Research Center (MSRC) stated: “The first exploit identified as CVE-2022-41040, is a Server-Side Request Forgery (SSRF) vulnerability, and the second one, identified as CVE-2022-41082, allows [...]
Microsoft has released security updates for two zero-day vulnerabilities: CVE-2022-41040, a server-side request forgery vulnerability, and CVE-2022-41082, which allows remote code execution. Collectively known as ProxyNotShell, the Exchange Server vulnerabilities have led to a spate of attacks linked to nation-state threat actors since late September. The SUs address vulnerabilities responsibly reported to Microsoft by security [...]
In an ongoing battle that started in 2018 with the EU, several state courts, including the federal German court, found that Microsoft 365 was not compliant with GDPR laws. The ban mostly affects educational institutions and companies that use Microsoft’s 365 product line. The ban comes after Microsoft ended its special arrangements with German users. An [...]
The SUs address vulnerabilities responsibly reported to Microsoft by security partners and found through Microsoft’s internal processes. Our recommendation is to immediately install these updates to protect your environment. NOTE The October 2022 SUs do not contain fixes for the zero-day vulnerabilities reported publicly on September 29, 2022 (CVE-2022-41040 and CVE-2022-41082). Please see this blog post to apply mitigations for those [...]
Summary: In early August, researchers from the cybersecurity vendor GTSC discovered cyberattacks against critical infrastructure using two unpublished Exchange Server security vulnerabilities. Microsoft’s Security Research Center (MSRC) stated: “The first exploit identified as CVE-2022-41040, is a Server-Side Request Forgery (SSRF) vulnerability, and the second one, identified as CVE-2022-41082, allows Remote Code Execution (RCE) when PowerShell [...]
In response to the recent targeting of critical infrastructure in the US and abroad, the Cybersecurity and Infrastructure Security Agency (CISA) urges network and security administrators to prepare and immediately mitigate potential cyber threats with the following measures. Implement and apply backup and recovery policies and procedures: Maintain offline backups of data Regularly test backup and restoration Ensure [...]
Microsoft Security Threat Intelligence has been tracking multiple ransomware campaigns by a group known as DEV-0270 who also goes by the alias Nemesis Kitten. Who is DEV-0270? DEV-0270, a sub-group of the Iranian threat actor known as PHOSPHORUS, are known for leveraging newly disclosed vulnerabilities against their targets. If successful, the group contacts the victim [...]
Security breaches cause organizational chaos, financial and reputation risk. Given how organizations have shifted to a hybrid of in-office and work-from-home, there is a significant increase in the security threat landscape, and it’s more important than ever to improve and harden Exchange Server security. These best practices help provide a baseline security framework that all [...]
Firstline workers comprise over 2 billion employees including retail sales associates, hospitality staff, medical workers and teams on the manufacturing floor. Often, they are the first and only representation of your brand with your customers. To help transform and empower this workforce at a reasonable cost, Microsoft created the Office 365 F1 plan (a replacement [...]
Congratulations to the Microsoft Exchange team on the release of Exchange 2016! We know you've spent nearly three years iterating, polishing and refining Exchange 2016 since the prior Exchange release, and that on-premises customers have been eagerly awaiting today's release. For those of you wanting to get hands on with Exchange 2016, the Exchange Team has provided a link from the [...]
We can appreciate that, at times, being a Microsoft Exchange Server administrator can be a challenging role. You’re dealing with demands on server space, architecture questions, the day-to-day costs of operating and managing an efficient system, and the headaches that come with server maintenance and repairs. Well, have we got some good [...]
