Category Archives: Windows

Let's Encrypt certificate trouble with Windows, Sophos UTM, macOS/iOS (2021/09/30)

Posted on 2021-09-30 by guenni

[German]As of September 30, 2021, some root certificates that Let's-Encrypt used to sign user certificates expired. This meant that certain devices or applications could no longer access websites or mail servers. I have seen cases with iOS 14/15 and macOS, … Continue reading →

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Tip: Windows PrintNightmare test tools for administrators

Posted on 2021-09-28 by guenni

[German]Administrators may be faced with the problem of testing their machine inventory to determine if individual installations are vulnerable to the PrintNightmare vulnerabilities in Windows. Furthermore, it may be necessary to remove or add printers. Someone did the work and … Continue reading →

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Windows 10: 0patch fix for MSHTML vulnerability (CVE-2021-40444)

Posted on 2021-09-27 by guenni

[German]The vulnerability CVE-2021-40444 in the Windows MSHTML library has been known since September 7, 2021. Attackers try to attack Windows machines via this vulnerability using manipulated Office files. There are security updates from Microsoft, but not for older Windows versions. … Continue reading →

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Windows 10: Microsoft fixes issues with Sept. update using KIR

Posted on 2021-09-27 by guenni

[German]In September 2021 updates for Windows 10 could cause issues: Some applications no longer started or could no longer access their data. The cause is a problem in the Microsoft Exploit Protection Export Address Filtering (EAF) function. Microsoft has confirmed … Continue reading →

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Exchange Server September 2021 CU comes Sept. 28 with Microsoft Exchange Emergency Mitigation Service

Posted on 2021-09-27 by guenni

[German]A brief article about Microsoft Exchange Server (On-Premises). The release of the Cumulative Update (CU) for Microsoft Exchange Server for September 2021 has been postponed to September 28, 2021. There are supposed to be some new features with the cumulative … Continue reading →

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Why ISL Online: Critical factors when choosing a remote desktop solution

[Sponsored Post]In the rapidly evolving IT world, choosing the right remote desktop software is critical for organizations that value security, ease of use and reliability. One provider of secure remote access that has been on the market since 2001 is ISL Online, which presents some considerations for choosing such software below. More ...

Windows 10 1909 Preview Updates September 21, 2021

Posted on 2021-09-24 by guenni

[German]Small addendum from this week, as Microsoft has released two preview updates (KB500562, KB5005625) for Windows 10 (Enterprise/Education and Server variants of 1809 and 1909) as of Sept. 21, 2021. The preview updates are optional and are intended to fix … Continue reading →

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Microsoft Exchange autodiscover design flaw leaks credentials to third party instances

Posted on 2021-09-23 by guenni

[German]Security researchers at Guardicore have discovered a design flaw in Microsoft Exchange autodiscover protocol that allows attackers to use external autodiscover domains to harvest domain credentials. This is possible because autodiscover domains outside the user's domain (but still in the … Continue reading →

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Windows PrintNightmare: Status, issues and workarounds (Sept. 22, 2021)

Posted on 2021-09-22 by guenni

[German]Since the patchday of September 14, 2021, when further security updates to close the PrintNightmare vulnerabilities are delivered, there are massive problems with network printers in some environments. The background is that Microsoft implemented certain security measures in August and … Continue reading →

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Windows September 2021 Update: Workaround for some printing issues

Posted on 2021-09-20 by guenni

[German]For patchday on September 14, 2021, Microsoft has released security updates for the supported Windows systems, which should also eliminate further PrintNightmare vulnerabilities. However, these updates cause problems so that network printers can no longer be controlled. In some cases, … Continue reading →

Posted in issue, Update, Windows | Tagged , , , , | 6 Comments

Windows PrintNightmare: Microsoft confirms printing problems after Sept. 2021 update

Posted on 2021-09-18 by guenni

[German]For months, a number of vulnerabilities in the Windows Print Spooler service have existed in all versions of Windows, collectively known as PrintNightmare. Microsoft has been trying in vain to close the vulnerabilities completely since July 2021, but is having … Continue reading →

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