That makes 31.7% of servers that may still be vulnerable. 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. 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. The disclosure follows last month's out-of-band (OOB) security update which addressed four zero-day vulnerabilities in Exchange Server that were exploited in the . 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. Out of the 306,552 Exchange OWA servers we observed, 222,145 or 72.4% were running an impacted version of Exchange (this includes 2013, 2016, and 2019). This update is available through Windows Update. 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. CVE-2021-28483 Install the following critical patches for the Windows Operating system. This issue occurs also in privacy window modes (such asInPrivate mode in Microsoft Edge). All Exchange Administration can be done via Remote PowerShell while the Exchange Control Panel is disabled. If you have restricted your firewall to Microsoft only (when running Exchange hybrid) you are less vulnerable, but the risk is not reduced to zero. Add download domain to OWA virtual directory Step 5. Check back to this article for updates in the coming days. CVE-2021-26855: A server-side request forgery (SSRF) vulnerability in Exchange which allowed the attacker to send arbitrary HTTP requests and authenticate as the Exchange server. Having patched systems in response to last months vulnerability does not protect them from the current vulnerabilities. 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. Type the full path of the .msp file, and then press Enter. 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 Microsoft released details on an active state-sponsored threat campaign exploiting four zero-day vulnerabilities in on-premises instances of Microsoft Exchange Server. This vulnerability does not require authentication, and is trivial to exploit. To fix this issue, use Services Manager to restore the startup type to Automatic, and then start the affected Exchange services manually. ProxyShell works by abusing the Client . Remediate and quarantine them for further investigation unless they are expected customizations in your environment. 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. CVE-2021-34470 is only addressed in the security update for Exchange 2013 CU23. You must be a registered user to add a comment. This can be used to validate patch and mitigation state of exposed servers. Accordingly, the U.S. CISA, which issued a directive to federal agencies last month in response to the first set of Exchange Server vulnerabilities, has issued a supplemental to its directive regarding the new set. The software versions affected are Microsoft Exchange Server 2013, 2016, and 2019. The software vulnerabilities involved include CVE-2021-26855, CVE-2021-26857, CVE-2021-26858, and CVE . Download thelist of files that are included in this security update KB5000871. https://github.com/microsoft/CSS-Exchange/blob/main/Security/, https://techcommunity.microsoft.com/t5/exchange-team-blog/released-march-2021-exchange-server-security-updates/ba-p/2175901, https://www.iis.net/downloads/microsoft/url-rewrite, https://www.microsoft.com/en-us/download/details.aspx?id=5747, https://www.microsoft.com/en-us/download/details.aspx?id=7435, Microsoft Safety Scanner Download Windows security, How to troubleshoot an error when you run the Microsoft Safety Scanner, Awareness and guidance related to OpenSSL 3.0 3.0.6 risk (CVE-2022-3786 and CVE-2202-3602), Microsoft Mitigates Vulnerability in Jupyter Notebooks for Azure Cosmos DB, Reflecting on Cybersecurity Awareness Month: At its Core, Cybersecurity is all about People. Remediate any identified exploitation or persistence and investigate your environment for indicators of lateral movement or further compromise. 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>. Use the Exchange Server Health Checker script (use the latest release) to inventory your servers. When this issue occurs, you dont receive an error message or any indication that the security update was not correctly installed. The four vulnerabilities in question impact Exchange Server 2013, 2016 and 2019, and have been assigned CVEs 2021-28480, -28481, -28482 and -28483. First exploiting a server-side request forgery (SSRF) vulnerability documented as CVE-2021-26855 to send arbitrary HTTP requests and authenticate as the Microsoft Exchange server. Exchange services mightremain in a disabled state after you install this security update. While Exchange 2010 is not vulnerable to the same attack chain as Exchange 2013/2016/2019, Microsoft has released a patch for CVE-2021-26857 for this version of the . Installing URL Rewrite version 2.1 on IIS versions 8.5 and lower may cause IIS and Exchange to become unstable. Investigation Regarding Misconfigured Microsoft Storage Location. This vulnerability can be chained with the CVE-2021-26855 SSRF vulnerability to allow an unauthenticated attack. These mitigations are not a remediation if your Exchange servers have already been compromised, nor are they full protection against attack. Once initial exploitation is successful actors are able to retrieve e-mail inventories from all users stored on the server. Add download domain to external DNS Step 3. We recommend initiating an investigation in parallel with or after applying one of the following mitigation strategies. This should only be used as a temporary mitigation until Exchange servers can be fully patched, and we recommend applying all of the mitigations at once. Microsoft Exchange Managed Availability services are also disabled to prevent mitigation regression. Interim mitigations if unable to patch Exchange Server 2013, 2016, and 2019: These mitigations can be applied or rolled back using the ExchangeMitigations.ps1 script described below and have some known impact to Exchange Server functionality. Update March 15, 2021: If you have not yet patched, and have not applied the mitigations referenced below, a one-click tool, the Exchange On-premises Mitigation Tool is now our recommended path to mitigate until you can patch. Will Microsoft be releasing November 2021 SUs for older (unsupported) versions of Exchange CUs?No. 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. This vulnerability can be exploited to run arbitrary code in the target system. Vulnerability CVE-2021-34470 Without explicit action by a schema admin in your organization, you might be vulnerable to CVE-2021-34470 if: You ran Exchange Server in the past, but you have since uninstalled all Exchange servers. ). CVE-2022-41082: A remote code execution (RCE) vulnerability. On March 2, 2021 (US Time), Microsoft has released information regarding multiple vulnerabilities in Microsoft Exchange Server. When you try to manually install this security update by double-clicking the update file (.msp) to run it in normal mode(that is, not as an administrator), some files are not correctly updated. 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. Updates are available for the current CU and the CU before. 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 ). The ACSC is aware of malicious actors exploiting CVE-2021-26855 for initial access to the vulnerable Microsoft Exchange servers. Description of the security update for Microsoft Exchange Server 2019, 2016, and 2013: April 13, 2021 (KB5001779) We installed November 2021 SU on our Exchange 2016/2019 servers. Note: Office 365 or Exchange Online environments are not affected and no action is required. This issue occurs because browser restrictions prevent the response from being recorded. 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'. 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. Add download domain to certificate Step 4. If events are found, please work with your Security Response team to analyze the server further. 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. Volexity identified a large amount of data being sent to IP addresses it believed were not tied to legitimate users. Customers should choose one of the following mitigation strategies based on your organizations priorities: Recommended solution: Install the security patch. Exchange Online is not affected. After installation of November SUs on your on-premises Exchange servers when in hybrid, you might see OWA redirection URL for hybrid users provide an incorrectly encoded URL, causing the redirect to fail. Check CVE-2021-1730 vulnerability status Configure Download Domains Step 1. Download Security Update For Exchange Server 2019 Cumulative Update 8 (KB5000871), Download Security Update For Exchange Server 2019 Cumulative Update 7 (KB5000871), Download Security Update For Exchange Server 2016 Cumulative Update 19 (KB5000871), Download Security Update For Exchange Server 2016 Cumulative Update 18 (KB5000871), Download Security Update For Exchange Server 2013 Cumulative Update 23 (KB5000871), Download Security Update For Exchange Server 2016Cumulative Update 14(KB5000871), Download Security Update For Exchange Server 2016Cumulative Update 15(KB5000871), Download Security Update For Exchange Server 2016Cumulative Update 16(KB5000871), Download Security Update For Exchange Server 2019Cumulative Update 4(KB5000871), Download Security Update For Exchange Server 2019Cumulative Update 5(KB5000871), Download Security Update For Exchange Server 2019Cumulative Update 6(KB5000871), Download Security Update For Exchange Server 2013Cumulative Update 21(KB5000871), Download Security Update For Exchange Server 2013Cumulative Update 22(KB5000871), Download Security Update For Exchange Server 2016Cumulative Update 12(KB5000871), Download Security Update For Exchange Server 2016Cumulative Update 13(KB5000871), Download Security Update For Exchange Server 2016Cumulative Update 17(KB5000871), Download Security Update For Exchange Server 2019Cumulative Update 3(KB5000871), Download Security Update For Exchange Server 2016Cumulative Update 8(KB5000871), Download Security Update For Exchange Server 2016Cumulative Update 9(KB5000871), Download Security Update For Exchange Server 2016Cumulative Update 10(KB5000871), Download Security Update For Exchange Server 2016Cumulative Update 11(KB5000871), Download Security Update For Exchange Server 2019RTM(KB5000871), Download Security Update For Exchange Server 2019Cumulative Update 1(KB5000871), Download Security Update For Exchange Server 2019Cumulative Update 2(KB5000871), Download Security Update For Exchange Server 2013SP1(KB5000871). 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