In the results, right-click Command Prompt, and then select Run as administrator. The zero-days are present in Microsoft Exchange Server 2013, 2016, and 2019. . Use the Exchange Server Health Checker script (use the latest release) to inventory your servers. If you use WSUS, please download the updated WSUS cab file. Download thelist of files that are included in this security update KB5000871. The articles or blogs and their contents are intended for general guidance and informational purposes only. Using this SYSTEM-level authentication to send SOAP payloads that are insecurely deserialized by the Unified Messaging Service, as documented in CVE-2021-26857. When you turn on automatic updating, this update will be downloaded and installed automatically. For customers that are not able to quickly apply updates, we are providing the following alternative mitigation techniques to help Microsoft Exchange customers who need more time to patch their deployments and are willing to make risk and service function trade-offs. Tip: A convenient tool was created in response to the March vulnerabilities to help organizations determine if they need to patch, if they have any issues with software configuration, and where to go for updates. The breach is . Microsoft has released out-of-band security updates to address four vulnerabilities in Exchange Server: CVE-2021-26855 allows an unauthenticated attacker to send arbitrary HTTP requests and authenticate as the Exchange Server. It appears that the measures used to resolve the ProxyShell vulnerabilities (a collective name for three related Microsoft Exchange vulnerabilities: CVE-2021-34473, CVE-2021-34523 and CVE-2021-31207) were not entirely successful. Congratulations to the Top MSRC 2022 Q3 Security Researchers! This condition mightoccur if the service control scripts experience a problem when they try to return Exchange services to theirusual state. by searching for "Security Update For Exchange Server 2013 CU23" we identified patches for a specific version of Exchange. 11/10: Changed the PowerShell query for event searches from an olderGet-EventLog to a newer and more performantGet-WinEvent. Note:This issue does not occur if you install the update through Microsoft Update. How to detect CVE-2021-26855 in your vendor network VendorRIsk customers can determine if any of their vendors are currently impacted by this flaw through the following sequence: Step 1: Select "Portfolio Risk Profile" in the left-hand module menu. Congratulations to the Top MSRC 2022 Q3 Security Researchers! There will be have a corresponding item IPM.FileSet in OAB folder of SystemMailbox {bb558c35-97f1-4cb9-8ff7-d53741dc928c}@domaincorp.com mailbox with subject <oab_guid>. Select Language: Download DirectX End-User Runtime Web Installer DirectX End-User Runtime Web Installer Security Update For Exchange Server 2013 CU23 (KB5004778) System Requirements The issue occurs because the security update doesnt correctly stop certain Exchange-related services. Installing URL Rewrite version 2.1 on IIS versions 8.5 and lower may cause IIS and Exchange to become unstable. These are unrelated to the MS Exchange vulnerability but were released in the same batch of patches and are also a high priority if they are applicable. Microsoft has released updates addressing Exchange Server versions 2010, 2013, 2016, and 2019. Running this script will tell you if any of your Exchange Servers are behind on updates (CUs and SUs). The November 2021 security updates for Exchange Server address vulnerabilities reported by security partners and found through Microsofts internal processes. That is reflected in the high scores applied to the vulnerabilities, which range from 8.8 to 9.8 (critical). No exploits have yet been observed of the vulnerabilities, but their critical nature requires fast action. 27. Best practices and the latest news on Microsoft FastTrack, The employee experience platform to help people thrive at work, Expand your Azure partner-to-partner network, Bringing IT Pros together through In-Person & Virtual events. Microsoft Exchange Server 2013 - 15.00.1497.012; Microsoft Exchange Server 2016 - 15.01.2106.013; Microsoft Exchange Server 2019 - 15.02.0721.013 . Go to https://aka.ms/ExchangeUpdateWizard and choose your currently running CU and your target CU to get directions for your environment. Exchange 2013 was chosen here because it was the . The advanced monitoring capabilities of Exchange are also disabled, due to disabling Microsoft Exchange Managed Availability services. To enable this setting, refer to the specific support documentation forthe browser. This puts the onus of responsibility on customers themselves to recognize and patch their systems. All Exchange Administration can be done via Remote PowerShell while the Exchange Control Panel is disabled. According to Microsoft, four of these vulnerabilities have already been exploited in limited targeted attacks . Step 2. It could authenticate by exploiting the CVE-2021-26855 SSRF vulnerability or by compromising a legitimate admin's . To record the response and enable the add-in, you must enable third-party cookies for the domain that's hosting OWA or Office Online Server in the browser settings. To avoid this issue, run the security update at an elevated command prompt. Check for Exchange Server CVEs CVE-2021-26855, CVE-2021-26857, CVE-2021-26858 and CVE-2021-27065 using Outlook Web App path data. Do I need to do anything?While Exchange Online customers are already protected, the November 2021 security updates do need to be applied to your on-premises Exchange Servers, even if they are used only for management purposes. Check for the vulnerability:.\Test-CVE-2021-34470.ps1. This has now been corrected to mentionWindows Server Update Services (WSUS) instead (which is where the problem is. This issue occurs because browser restrictions prevent the response from being recorded. CVE-2021-27065 (Arbitrary File Write) CVSS:3.0 7.8 / 7.2. Fix the vulnerability if found:.\Test-CVE-2021-34470.ps1 -ApplyFix CVE-2021-34473 provides a mechanism for pre-authentication remote code execution, enabling malicious actors to remotely execute code on an affected system. Impact: Unified Messaging/Voicemail outage when these services are disabled. We encourage organizations to use it! Description: This mitigation will disable the Exchange Control Panel (ECP) Virtual Directory. The ACSC is aware of malicious actors exploiting CVE-2021-26855 for initial access to the vulnerable Microsoft Exchange servers. Microsoft Exchange Managed Availability services are also disabled to prevent mitigation regression. If there is a mismatch between the URL Rewrite module and IIS version, ExchangeMitigations.ps1 will not apply the mitigation for CVE-2021-26855. Exchange Server software is used for on-premise servers, meaning that Microsoft will not be able to force a software update across all of its customers, as the company occasionally has done with exploits to its cloud-based software services such as Office 365 or Exchange Online. CVE-2021-28483 Install the following critical patches for the Windows Operating system. A remote attacker may execute arbitrary code with SYSTEM privileges by leveraging these vulnerabilities. You must be a registered user to add a comment. This update is available through Windows Update. Having patched systems in response to last months vulnerability does not protect them from the current vulnerabilities. 1) Locate all Exchange Servers and determine whether they need to be patched. Exchange Online is not affected. XSPA Microsoft Exchange Server Spoofing Vulnerability CVE-2021-31209 8.1 - High - May 11, 2021 Microsoft Exchange Server Spoofing Vulnerability Microsoft Exchange Server Security Feature Bypass Vulnerability This script checks targeted exchange servers for signs of the proxy logon compromise. Work with your IT department to ensure the following Microsoft Exchange Server patches are installed (see tip below for more help): Install the following critical patches for the Windows Operating system. This notification provides guidance for customers regarding new security updates released by Microsoft to resolve privately reported security vulnerabilities that affect Exchange Server 2013, Exchange Server 2016, and Exchange Server 2019. On April 13, 2021, CISA issued ED 21-02 Supplemental Direction V2, which directs federal departments and agencies to apply Microsoft's April 2021 Security Update that newly discloses and mitigates significant vulnerabilities affecting on-premises Exchange Server 2013, 2016, and 2019. The software versions affected are Microsoft Exchange Server 2013, 2016, and 2019. Implement an IIS Re-Write Rule to filter malicious https requests, Disable Exchange Control Panel (ECP) VDir. Microsoft Exchange Server Spoofing Vulnerability This CVE ID is unique from CVE-2021-24085. Microsoft Defender has included security intelligence updates to the latest version of the Microsoft Safety Scanner (MSERT.EXE) to detect and remediate the latest threats known to abuse the Exchange Server vulnerabilities disclosed on March 2, 2021. Similar to last months Exchange Server zero-days, an attacker could remotely gain considerable control within a victims exchange environment to execute ransomware, or drop difficult-to-identify web shells, or other malware, that can be later activated to launch an attack. We are aware of limited targeted attacks in the wild using one of vulnerabilities ( CVE-2021-42321 ), which is a post-authentication vulnerability in Exchange 2016 and 2019. Known issues - requires a valid SSL certificate if using SSL/TLS In April's Patch Tuesday round, 114 CVEs were tackled -- 19 of which deemed critical -- including two remote code execution (RCE) vulnerabilities reported by the US National Security Agency (NSA),. To fix this issue, use Services Manager to restore the startup type to Automatic, and then start the affected Exchange services manually. You can get the standalone update package through the Microsoft Download Center. Check CVE-2021-1730 vulnerability status Configure Download Domains Step 1. The advanced monitoring capabilities of Exchange are also disabled, due to disabling Microsoft Exchange Managed Availability services. My organization is in Hybrid mode with Exchange Online. Tools and advice may evolve in response to attack activity and/or any further discoveries. Some security researchers have reported that attackers are currently exploiting two zero-day vulnerabilities in Microsoft Exchange Server. Search your IIS logs to identify whether or not the files identified as malicious have been accessed. Environments where the latest version of Exchange Server is any version before Exchange 2013, or environments where all Exchange servers have been removed, can use this script to address the vulnerability. Enable Download Domains Confirm Download Domains enabled Conclusion In particular, if you're running Exchange 2016 or 2019, the security updates address a known post-authentication vulnerability circulating in the wild ( CVE-2021-42321 ). Additional Updates (as of 4/15/21) "On April 13, as part of its April 2021 Patch Tuesday release, Microsoft addressed four critical vulnerabilities in Microsoft Exchange Server. An . This may result in stale address book results in some scenarios and configurations. To learn more about these vulnerabilities, see the following Common Vulnerabilities and Exposures (CVE): CVE-2021-26412 Microsoft Exchange Server Remote Code Execution Vulnerability CVE-2021-27078 Microsoft Exchange Server Remote Code Execution Vulnerability Note: Office 365 or Exchange Online environments are not affected and no action is required. These are not just a number of new Security Updates, but these are Security Updates for a zero-day vulnerability and as such rated as 'critical'. Microsoft Exchange Server Remote Code Execution Vulnerability This CVE ID is unique from CVE-2021-26412, CVE-2021-26854, CVE-2021-26855, CVE-2021-26857, CVE-2021-26858, CVE-2021-27078. Otherwise, register and sign in. This security update rollup resolves vulnerabilities in Microsoft Exchange Server. While the timing of the release on Microsoft's traditional "patch Tuesday" might suggest that these updates are run-of-the-mill, the involvement of the NSA suggests an elevated level of importance. Cisco Talos has released new coverage to detect and prevent the exploitation of two recently disclosed vulnerabilities collectively referred to as "ProxyNotShell," affecting Microsoft Exchange Servers 2013, 2016 and 2019. Please update your servers to resolve the vulnerability. The zero-day vulnerability is being actively exploited by threat actors to target Windows users. CVE-2021-31206 was the vulnerability discovered at the Pwn2Own 2021 contest. F43DACE881230595678BEC7A0C24E17618CBA6196CDE86D80058B2BCF3A263B6, 5DBF2F3C65CA9B5D6A4E1B30EEC1327C17737E6ADA0B528BB83CD2D90ED3C8E9, 9B1FCB9DCCBC398F3E894A1BBD34FD6583F315F743A205B889FE9755D3F4F807, Exchange Server 2016 Cumulative Update 16, 992E059C01872BEE7FB2A3082FEE8C630332450220F9770BC2BBAC3769E9D2A8, Exchange Server 2016 Cumulative Update 15, 0208AB1E3D1B9884D67130B355AB3A963DD3BB70FAECA12D1BE102DC78A0F38D, Exchange Server 2016 Cumulative Update 14, 0DFB6E97D4BE071D696C0CA7BF0F7DF06C9EB323A3E048038E69CD82A31CE5C4, EC716655A910E204D5528B6017E6647A9B83C38714360138CD3FD036C2791A41, 1FAF5C2F995231A203A7C3FE97052AFD7924A6A57AC52155AC72DF825AB654C9, Exchange Server 2016 Cumulative Update 19, 26BBEA76A03363F6CFCFA60EC384BCC5DE021F06765FEAE1941EDD7A0C2AFFF4, Exchange Server 2016 Cumulative Update 18, 7C7DA7E41628445FB7B6E8314F38530F0CC1F738153963CFFEA2D52F4E1E6B94, Exchange Server 2013 Cumulative Update 23, 42ACE35CB2BF1202C6ABC2F3BCF689A244C9566ED9CC466D2AFBE6ED691D42E3, DEFAFA95825644D7598171C820FB77A7DDBEE31183B51018424F333D4F65236A, Exchange Server 2016 Cumulative Update 17, 4E83567ED4202C7784654C2707D15AB384EFEAA51121D5D0918BCC040CBFA91A, Exchange Server 2016 Cumulative Update 13, 82DDB7B2B1E3C9D9FFB47C2A1F4813AF6D177F5748D2829F067F5D92EF1F38BB, Exchange Server 2016 Cumulative Update 12, 295325D460462F5A60E8AB7EFDB2EE15C718D5681A54D0CAC9091117E3A2B5DE, Exchange Server 2013 Cumulative Update 22, D4FAC21AEDB062744FADFF7950BA5F00F83D94721BCEDA0077852359F9F9F74C, Exchange Server 2013 Cumulative Update 21, E7A4056271FF35BB7D45D70AFDA226A8F4C7B0033246E7C7DD679414A48AAF9D, FDAA9379C910229A747170EDC4FF7E70235600F4CC30DAFA387858E4DB3CFC0C, 3134C249DF3F9A7B76AFFE7C257F01E3647BC63F680E0FD600CB78FEDE2E081B, 482BBBA9A39C936184FFE37FFB193793CDB162FB3B96AEE3A927E6B54B191C3A, Exchange Server 2016 Cumulative Update 11, 4F041E8C752E15F26AA536C3158641E8E80E23124689714F2E4836AA7D3C03CA, Exchange Server 2016 Cumulative Update 10, 8E31B64B8BD26A9F9A0D9454BAF220AACA9F4BC942BCF0B0ED5A2116DD212885, 8F13226F12A5B14586B43A80136D9973FE6FBB5724015E84D40B44087766E52E, 7661ECCFA103A177855C8AFFE8DDFEA0D8BDD949B6490976DC7A43CC0CD9078F, D0CCE0312FCEC4E639A18C9A2E34B736838DC741BAD188370CBFFFA68A81B192. Impact: OAB will be unavailable, including downloads of the Offline Address Book by Outlook clients. Description of the security update for Microsoft Exchange Server 2019, 2016, and 2013: April 13, 2021 (KB5001779) The November 2021 security updates for Exchange Server address vulnerabilities reported by security partners and found through Microsoft's internal processes.
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