Summary CERT-UA, Ukraine's Computer Emergency Response Team, was the first to discover the vulnerability with a 9.8 CVSS score that affects all supported versions of Outlook for Windows. Microsoft reported that a group of Russian hackers took advantage of the NTLM vulnerability to attack a number of European and military organizations in 2022. The Threat [...]
The March 2023 SUs address vulnerabilities responsibly reported to Microsoft by security partners and found through Microsoft’s internal processes. Although we are not aware of any active exploits in the wild, our recommendation is to install these updates immediately to protect your environment. Official announcement can be found here. Microsoft has released Security Updates (SUs) for [...]
We’ve seen a wave of cyberattacks and data breaches that swept across the globe with multiple zero-day exploits discovered in Exchange Online and On-premises. Microsoft is urging admins to protect their Exchange Servers by keeping Exchange servers updated with the latest CUs and SUs. “Attackers looking to exploit unpatched Exchange servers are not going to go away.” [...]
Microsoft recently posted that users have a mere 31 days left to migrate away from Exchange Server 2013 before it reaches End-of-life (EOL). The Exchange Team has confirmed that even though support is ending soon, the software will still function past its expiration date. Taking this route is a bit of a risk as Microsoft won't be [...]
Microsoft is looking into another global outage that has impacted Exchange Online, its cloud-based email system. The Microsoft 365 Status Twitter feed reported “impact is specific to users who are served through the affected infrastructure in North America, Europe, and the United Kingdom.” The thread continues, "We're investigating an issue wherein users may be unable [...]
Microsoft has released patches to fix numerous vulnerabilities in the February 2023 Patch Tuesday release including remote code execution in Exchange Server. Official announcement can be found here. Microsoft has released Security Updates (SUs) for vulnerabilities found in: Exchange Server 2013 Exchange Server 2016 Exchange Server 2019 To learn more about these vulnerabilities, see the following [...]
“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 [...]
Exchange Server 2013 will reach its end of support on April 11, 2023. If you haven't already begun your migration from Exchange 2013 to Microsoft 365, Office 365, or Exchange 2019, now's the time to start planning. This means all security updates and patches will be ending soon! After April 11th Microsoft will no longer [...]
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 [...]
The last few months have been busy. Lets look at the happenings and news from the Exchange Server Community: MEC Technical Airlift We hope you attended the Microsoft Exchange Conference ( MEC Technical Airlift ) and had an opportunity to engage with the community and listen to the keynote with Rajesh, Perry, and Jared. In [...]
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 [...]
Advisory Release CVE-2022-41082 was publicly disclosed by Microsoft on September 30, 2022, after being identified as part of an active exploitation campaign targeting Microsoft Exchange servers. The vulnerability was included in CISA’s Known Exploited Vulnerabilities (KEV) catalog on the same day, underscoring its significance and the urgency for remediation. Key Details CVE-2022-41082 is a remote [...]
Microsoft’s 365 Defender Research Team recently investigated an attack in which malicious OAuth applications were deployed on compromised cloud tenants. Initial Access The attacker first needed to compromise a cloud user’s account that had sufficient permissions in order to create a malicious OAuth application. The threat actor did this by launching credential-stuffing attacks against high-risk [...]
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 [...]
