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The Hacker News - Cybersecurity News and Analysis: Windows Update

Microsoft Releases Patch for Actively Exploited Windows Zero-Day Vulnerability

Microsoft Releases Patch for Actively Exploited Windows Zero-Day Vulnerability

September 14, 2021Ravie Lakshmanan
A day after  Apple  and  Google  rolled out urgent security updates, Microsoft has  pushed software fixes  as part of its monthly Patch Tuesday release cycle to plug 66 security holes affecting Windows and other components such as Azure, Office, BitLocker, and Visual Studio, including an  actively exploited zero-day  in its MSHTML Platform that came to light last week.  Of the 66 flaws, three are rated Critical, 62 are rated Important, and one is rated Moderate in severity. This is aside from the  20 vulnerabilities  in the Chromium-based Microsoft Edge browser that the company addressed since the start of the month. The most important of the updates concerns a patch for  CVE-2021-40444  (CVSS score: 8.8), an actively exploited remote code execution vulnerability in MSHTML that leverages malware-laced Microsoft Office documents, with EXPMON researchers noting "the exploit uses logical flaws so the exploitation is perfectly reliable." Also addressed is a publicly disclose
Microsoft Releases Windows Updates to Patch Actively Exploited Vulnerability

Microsoft Releases Windows Updates to Patch Actively Exploited Vulnerability

August 10, 2021Ravie Lakshmanan
Microsoft on Tuesday rolled out  security updates  to address a total of 44 security issues affecting its software products and services, one of which it says is an actively exploited zero-day in the wild. The update, which is the smallest release since December 2019, squashes seven Critical and 37 Important bugs in Windows, .NET Core & Visual Studio, Azure, Microsoft Graphics Component, Microsoft Office, Microsoft Scripting Engine, Microsoft Windows Codecs Library, Remote Desktop Client, among others. This is in addition to  seven security flaws  it patched in the Microsoft Edge browser on August 5. Chief among the patched issues is  CVE-2021-36948  (CVSS score: 7.8), an elevation of privilege flaw affecting Windows Update Medic Service — a service that enables remediation and protection of Windows Update components — which could be abused to run malicious programs with escalated permissions. Microsoft's Threat Intelligence Center has been credited with reporting the flaw
Update Your Windows PCs to Patch 117 New Flaws, Including 9 Zero-Days

Update Your Windows PCs to Patch 117 New Flaws, Including 9 Zero-Days

July 13, 2021Ravie Lakshmanan
Microsoft rolled out  Patch Tuesday updates  for the month of July with fixes for a total of 117 security vulnerabilities, including nine zero-day flaws, of which four are said to be under active attacks in the wild, potentially enabling an adversary to take control of affected systems.  Of the 117 issues, 13 are rated Critical, 103 are rated Important, and one is rated as Moderate in severity, with six of these bugs publicly known at the time of release.  The updates span across several of Microsoft's products, including Windows, Bing, Dynamics, Exchange Server, Office, Scripting Engine, Windows DNS, and Visual Studio Code. July also marks a dramatic jump in the volume of vulnerabilities, surpassing the number Microsoft collectively addressed as part of its updates in  May  (55) and  June  (50). Chief among the security flaws actively exploited are as follows — CVE-2021-34527  (CVSS score: 8.8) - Windows Print Spooler Remote Code Execution Vulnerability (publicly disclosed
Microsoft's Emergency Patch Fails to Fully Fix PrintNightmare RCE Vulnerability

Microsoft's Emergency Patch Fails to Fully Fix PrintNightmare RCE Vulnerability

July 07, 2021Ravie Lakshmanan
Even as Microsoft  expanded patches  for the so-called PrintNightmare vulnerability for Windows 10 version 1607, Windows Server 2012, and Windows Server 2016, it has come to light that the fix for the remote code execution exploit in the Windows Print Spooler service can be bypassed in certain scenarios, effectively defeating the security protections and permitting attackers to run arbitrary code on infected systems. On Tuesday, the Windows maker issued an  emergency out-of-band update  to address  CVE-2021-34527  (CVSS score: 8.8) after the flaw was accidentally disclosed by researchers from Hong Kong-based cybersecurity firm Sangfor late last month, at which point it emerged that the issue was different from another bug — tracked as  CVE-2021-1675  — that was patched by Microsoft on June 8. "Several days ago, two security vulnerabilities were found in Microsoft Windows' existing printing mechanism," Yaniv Balmas, head of cyber research at Check Point, told The Hack
Microsoft Issues Emergency Patch for Critical Windows PrintNightmare Vulnerability

Microsoft Issues Emergency Patch for Critical Windows PrintNightmare Vulnerability

July 06, 2021Ravie Lakshmanan
Microsoft has shipped an  emergency out-of-band security update  to address a critical zero-day vulnerability — known as "PrintNightmare" — that affects the Windows Print Spooler service and can permit remote threat actors to run arbitrary code and take over vulnerable systems. Tracked as  CVE-2021-34527  (CVSS score: 8.8), the remote code execution flaw impacts all supported editions of Windows. Last week, the company warned it had detected active exploitation attempts targeting the vulnerability. "The Microsoft Windows Print Spooler service fails to restrict access to functionality that allows users to add printers and related drivers, which can allow a remote authenticated attacker to execute arbitrary code with SYSTEM privileges on a vulnerable system," the CERT Coordination Center said of the issue. It's worth noting that PrintNightmare includes both remote code execution and a local privilege escalation vector that can be abused in attacks to run com
Update Your Windows Computers to Patch 6 New In-the-Wild Zero-Day Bugs

Update Your Windows Computers to Patch 6 New In-the-Wild Zero-Day Bugs

June 08, 2021Ravie Lakshmanan
Microsoft on Tuesday released another round of  security updates  for Windows operating system and other supported software, squashing 50 vulnerabilities, including six zero-days that are said to be under active attack. The flaws were identified and resolved in Microsoft Windows, .NET Core and Visual Studio, Microsoft Office, Microsoft Edge (Chromium-based and EdgeHTML), SharePoint Server, Hyper-V, Visual Studio Code - Kubernetes Tools, Windows HTML Platform, and Windows Remote Desktop. Of these 50 bugs, five are rated Critical, and 45 are rated Important in severity, with three of the issues publicly known at the time of release. The vulnerabilities that being actively exploited are listed below - CVE-2021-33742  (CVSS score: 7.5) - Windows MSHTML Platform Remote Code Execution Vulnerability CVE-2021-33739  (CVSS score: 8.4) - Microsoft DWM Core Library Elevation of Privilege Vulnerability CVE-2021-31199  (CVSS score: 5.2) - Microsoft Enhanced Cryptographic Provider Elevation
NSA Discovers New Vulnerabilities Affecting Microsoft Exchange Servers

NSA Discovers New Vulnerabilities Affecting Microsoft Exchange Servers

April 13, 2021Ravie Lakshmanan
In its April slate of patches, Microsoft rolled out fixes for a total of  114 security flaws , including an actively exploited zero-day and four remote code execution bugs in Exchange Server. Of the  114 flaws , 19 are rated as Critical, 88 are rated Important, and one is rated Moderate in severity. Chief among them is  CVE-2021-28310 , a privilege escalation vulnerability in Win32k that's said to be under active exploitation, allowing attackers to elevate privileges by running malicious code on a target system.  Cybersecurity firm Kaspersky, which discovered and reported the flaw to Microsoft in February, linked the zero-day exploit to a threat actor named Bitter APT, which was found exploiting a similar flaw ( CVE-2021-1732 ) in attacks late last year. "It is an escalation of privilege (EoP) exploit that is likely used together with other browser exploits to escape sandboxes or get system privileges for further access," Kaspersky researcher Boris Larin  said . NS
Microsoft Issues Security Patches for 89 Flaws — IE 0-Day Under Active Attacks

Microsoft Issues Security Patches for 89 Flaws — IE 0-Day Under Active Attacks

March 09, 2021Ravie Lakshmanan
Microsoft plugged as many as  89 security flaws  as part of its monthly Patch Tuesday updates released today, including fixes for an actively exploited zero-day in Internet Explorer that could permit an attacker to run arbitrary code on target machines. Of these flaws, 14 are listed as Critical, and 75 are listed as Important in severity, out of which two of the bugs are described as publicly known, while five others have been reported as under active attack at the time of release. Among those five security issues are a clutch of vulnerabilities known as  ProxyLogon  (CVE-2021-26855, CVE-2021-26857, CVE-2021-26858, and CVE-2021-27065) that allows adversaries to break into Microsoft Exchange Servers in target environments and subsequently allow the installation of unauthorized web-based backdoors to facilitate long-term access. But in the wake of Exchange servers coming under  indiscriminate assault  toward the end of February by multiple threat groups looking to exploit the vulner
Microsoft Issues Patches for In-the-Wild 0-day and 55 Others Windows Bugs

Microsoft Issues Patches for In-the-Wild 0-day and 55 Others Windows Bugs

February 09, 2021Ravie Lakshmanan
Microsoft on Tuesday  issued fixes for 56 flaws , including a critical vulnerability that's known to be actively exploited in the wild. In all, 11 are listed as Critical, 43 are listed as Important, and two are listed as Moderate in severity — six of which are previously disclosed vulnerabilities. The updates cover .NET Framework, Azure IoT, Microsoft Dynamics, Microsoft Edge for Android, Microsoft Exchange Server, Microsoft Office, Microsoft Windows Codecs Library, Skype for Business, Visual Studio, Windows Defender, and other core components such as Kernel, TCP/IP, Print Spooler, and Remote Procedure Call (RPC). A Windows Win32k Privilege Escalation Vulnerability The most critical of the flaws is a Windows Win32k privilege escalation vulnerability (CVE-2021-1732, CVSS score 7.8) that allows attackers with access to a target system to run malicious code with elevated permissions. Microsoft credited JinQuan, MaDongZe, TuXiaoYi, and LiHao of DBAPPSecurity for discovering and re
Microsoft Releases Windows Update (Dec 2020) to Fix 58 Security Flaws

Microsoft Releases Windows Update (Dec 2020) to Fix 58 Security Flaws

December 08, 2020Ravie Lakshmanan
Microsoft on Tuesday released fixes for 58 newly discovered security flaws spanning as many as 11 products and services as part of its final  Patch Tuesday of 2020 , effectively bringing their CVE total to 1,250 for the year. Of these 58 patches, nine are rated as Critical, 46 are rated as Important, and three are rated Moderate in severity. The December security release addresses issues in Microsoft Windows, Edge browser, ChakraCore, Microsoft Office, Exchange Server, Azure DevOps, Microsoft Dynamics, Visual Studio, Azure SDK, and Azure Sphere. Fortunately, none of these flaws this month have been reported as publicly known or being actively exploited in the wild. The fixes for December concern a number of remote code execution (RCE) flaws in Microsoft Exchange (CVE-2020-17132), SharePoint (CVE-2020-17118 and CVE-2020-17121), Excel (CVE-2020-17123), and Hyper-V virtualization software (CVE-2020-17095), as well as a patch for a security feature bypass in Kerberos (CVE-2020-16996)
Microsoft Releases Windows Security Updates For Critical Flaws

Microsoft Releases Windows Security Updates For Critical Flaws

November 11, 2020Ravie Lakshmanan
Microsoft formally released fixes for 112 newly discovered security vulnerabilities as part of its  November 2020 Patch Tuesday , including an actively exploited zero-day flaw disclosed by Google's security team last week. The rollout addresses flaws, 17 of which are rated as Critical, 93 are rated as Important, and two are rated Low in severity, once again bringing the patch count over 110 after a drop last month. The security updates encompass a range of software, including Microsoft Windows, Office and Office Services and Web Apps, Internet Explorer, Edge, ChakraCore, Exchange Server, Microsoft Dynamics, Windows Codecs Library, Azure Sphere, Windows Defender, Microsoft Teams, and Visual Studio. Chief among those fixed is  CVE-2020-17087  (CVSS score 7.8), a buffer overflow flaw in Windows Kernel Cryptography Driver ("cng.sys") that was  disclosed on October 30  by the Google Project Zero team as being used in conjunction with a Chrome zero-day to compromise Window
Microsoft Releases Patches For Critical Windows TCP/IP and Other Bugs

Microsoft Releases Patches For Critical Windows TCP/IP and Other Bugs

October 14, 2020Ravie Lakshmanan
Microsoft on Tuesday issued fixes for 87 newly discovered security vulnerabilities as part of its  October 2020 Patch Tuesday , including two critical remote code execution (RCE) flaws in Windows TCP/IP stack and Microsoft Outlook. The flaws, 11 of which are categorized as Critical, 75 are ranked Important, and one is classified Moderate in severity, affect Windows, Office and Office Services and Web Apps, Visual Studio, Azure Functions, .NET Framework, Microsoft Dynamics, Open Source Software, Exchange Server, and the Windows Codecs Library. Although none of these flaws are listed as being under active attack, six vulnerabilities are listed as publicly known at the time of release. Chief among the most critical bugs patched this month include  CVE-2020-16898  (CVSS score 9.8). According to Microsoft, an attacker would have to send specially crafted ICMPv6 Router Advertisement packets to a remote Windows computer to exploit the RCE flaw in the TCP/IP stack to execute arbitrary code
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