Advisories

1.0 Introduction

Recently, Microsoft has released updates to address multiple vulnerabilities in Microsoft software.

2.0 Impact
An attacker can exploit some of these vulnerabilities to take control of an affected system.

3.0 Affected Products
This release consists of security updates for the following products, features and roles.

• .NET Core
• Azure Machine Learning
• Azure Service Connector
• Microsoft Bluetooth Driver
• Microsoft Defender for Endpoint
• Microsoft Dynamics
• Microsoft Dynamics 365 Customer Voice
• Microsoft Edge (Chromium-based)
• Microsoft Graphics Component
• Microsoft Message Queuing
• Microsoft Office
• Microsoft Office Publisher
• Microsoft Office SharePoint
• Microsoft Office Word
• Microsoft PostScript Printer Driver
• Microsoft Printer Drivers
• Microsoft WDAC OLE DB provider for SQL
• Microsoft Windows DNS
• Visual Studio
• Visual Studio Code
• Windows Active Directory
• Windows ALPC
• Windows Ancillary Function Driver for WinSock
• Windows Boot Manager
• Windows Clip Service
• Windows CNG Key Isolation Service
• Windows Common Log File System Driver
• Windows DHCP Server
• Windows Enroll Engine
• Windows Error Reporting
• Windows Group Policy
• Windows Internet Key Exchange (IKE) Protocol
• Windows Kerberos
• Windows Kernel
• Windows Layer 2 Tunneling Protocol
• Windows Lock Screen
• Windows Netlogon
• Windows Network Address Translation (NAT)
• Windows Network File System
• Windows Network Load Balancing
• Windows NTLM
• Windows PGM
• Windows Point-to-Point Protocol over Ethernet (PPPoE)
• Windows Point-to-Point Tunneling Protocol
• Windows Raw Image Extension
• Windows RDP Client
• Windows Registry
• Windows RPC API
• Windows Secure Boot
• Windows Secure Channel
• Windows Secure Socket Tunneling Protocol (SSTP)
• Windows Transport Security Layer (TLS)
• Windows Win32K

4.0 Recommendations
MyCERT encourages users and administrators to review Microsoft’s April 2023 Security Update Guide and Deployment Information and apply the necessary updates.

Kindly refer to the following URL: https://msrc.microsoft.com/update-guide/releaseNote/2023-Apr

Generally, MyCERT advises the users of this devices to be updated with the latest security announcements by the vendor and follow best practice security policies to determine which updates should be applied.

For further enquiries, please contact MyCERT through the following channels:

E-mail: cyber999[at]cybersecurity.my 
Phone: 1-300-88-2999 (monitored during business hours) 
Mobile: +60 19 2665850 (24x7 call incident reporting) 
Business Hours: Mon - Fri 09:00 -18:00 MYT 
Web: https://www.mycert.org.my 
Twitter: https://twitter.com/mycert 
Facebook: https://www.facebook.com/mycert.org.my

5.0    References
https://www.cisa.gov/news-events/alerts/2023/04/11/microsoft-releases-april-2023-security-updates

1.0 Introduction

Recently, CISA has added one new vulnerability to its Known Exploited Vulnerabilities Catalog, based on evidence of active exploitation.

• CVE-2023-28252 Microsoft Windows Common Log File System (CLFS) Driver Privilege Escalation Vulnerability

2.0 Impact
These types of vulnerabilities are frequent attack vectors for malicious cyber actors and pose significant risks to the federal enterprise

3.0 Affected Products
Microsoft Windows OS

4.0 Recommendations
MyCERT strongly urges all organizations to reduce their exposure to cyberattacks by prioritizing timely remediation of Catalog vulnerabilities as part of their vulnerability management practice.

Kindly refer to the following URL : https://www.cisa.gov/known-exploited-vulnerabilities-catalog

Generally, MyCERT advises the users of this devices to be updated with the latest security announcements by the vendor and follow best practice security policies to determine which updates should be applied.

For further enquiries, please contact MyCERT through the following channels:

E-mail: cyber999[at]cybersecurity.my 
Phone: 1-300-88-2999 (monitored during business hours) 
Mobile: +60 19 2665850 (24x7 call incident reporting) 
Business Hours: Mon - Fri 09:00 -18:00 MYT 
Web: https://www.mycert.org.my 
Twitter: https://twitter.com/mycert 
Facebook: https://www.facebook.com/mycert.org.my

5.0    References
https://www.cisa.gov/news-events/alerts/2023/04/11/cisa-adds-one-known-exploited-vulnerability-catalog

1.0 Introduction

Recently, Microsoft has released Guidance for investigating attacks using CVE-2022-21894: The BlackLotus Campaign. According to Microsoft, “[t]his guide provides steps that organizations can take to assess whether users have been targeted or compromised by threat actors exploiting CVE-2022-21894 via a Unified Extensible Firmware Interface (UEFI) bootkit called BlackLotus.”

2.0 Impact
An attacker could exploit this vulnerability to take control of an affected system.

3.0 Affected Products
PCs with Microsoft Windows OS installed

4.0 Recommendations
MyCERT urges users and organizations to review the Microsoft Blog Post for more information, and apply necessary detection, recovery, and prevention strategies. 

Kindly refer to : https://www.microsoft.com/en-us/security/blog/2023/04/11/guidance-for-investigating-attacks-using-cve-2022-21894-the-blacklotus-campaign/

Generally, MyCERT advises the users of this devices to be updated with the latest security announcements by the vendor and follow best practice security policies to determine which updates should be applied.

For further enquiries, please contact MyCERT through the following channels:

E-mail: cyber999[at]cybersecurity.my 
Phone: 1-300-88-2999 (monitored during business hours) 
Mobile: +60 19 2665850 (24x7 call incident reporting) 
Business Hours: Mon - Fri 09:00 -18:00 MYT 
Web: https://www.mycert.org.my 
Twitter: https://twitter.com/mycert 
Facebook: https://www.facebook.com/mycert.org.my

5.0    References

• https://www.cisa.gov/news-events/alerts/2023/04/11/microsoft-releases-guidance-for-the-blacklotus-campaign
• https://www.microsoft.com/en-us/security/blog/2023/04/11/guidance-for-investigating-attacks-using-cve-2022-21894-the-blacklotus-campaign/

1.0 Introduction

Recently, Microsoft has released updates to address multiple vulnerabilities in Microsoft software.

2.0 Impact
An attacker can exploit some of these vulnerabilities to take control of an affected system.

3.0 Affected Products
This release consists of security updates for the following products, features and roles.

• Azure
• Client Server Run-time Subsystem (CSRSS)
• Internet Control Message Protocol (ICMP)
• Microsoft Bluetooth Driver
• Microsoft Dynamics
• Microsoft Edge (Chromium-based)
• Microsoft Graphics Component
• Microsoft Office Excel
• Microsoft Office Outlook
• Microsoft Office SharePoint
• Microsoft OneDrive
• Microsoft PostScript Printer Driver
• Microsoft Printer Drivers
• Microsoft Windows Codecs Library
• Office for Android
• Remote Access Service Point-to-Point Tunneling Protocol
• Role: DNS Server
• Role: Windows Hyper-V
• Service Fabric
• Visual Studio
• Windows Accounts Control
• Windows Bluetooth Service
• Windows Central Resource Manager
• Windows Cryptographic Services
• Windows Defender
• Windows HTTP Protocol Stack
• Windows HTTP.sys
• Windows Internet Key Exchange (IKE) Protocol
• Windows Kernel
• Windows Partition Management Driver
• Windows Point-to-Point Protocol over Ethernet (PPPoE)
• Windows Remote Procedure Call
• Windows Remote Procedure Call Runtime
• Windows Resilient File System (ReFS)
• Windows Secure Channel
• Windows SmartScreen
• Windows TPM
• Windows Win32K

4.0 Recommendations
MyCERT encourages users and administrators to review Microsoft’s March 2023 Security Update Guide and Deployment Information and apply the necessary updates. Kindly refer to the URLs below:

Microsoft’s March 2023 Security Update Guide : https://msrc.microsoft.com/update-guide/releaseNote/2023-Mar
Deployment Information : https://msrc.microsoft.com/update-guide/deployments

Generally, MyCERT advises the users of this devices to be updated with the latest security announcements by the vendor and follow best practice security policies to determine which updates should be applied.

For further enquiries, please contact MyCERT through the following channels:

E-mail: cyber999[at]cybersecurity.my 
Phone: 1-300-88-2999 (monitored during business hours) 
Mobile: +60 19 2665850 (24x7 call incident reporting) 
Business Hours: Mon - Fri 09:00 -18:00 MYT 
Web: https://www.mycert.org.my 
Twitter: https://twitter.com/mycert 
Facebook: https://www.facebook.com/mycert.org.my

5.0    References

• https://www.cisa.gov/news-events/alerts/2023/03/14/microsoft-releases-march-2023-security-updates
• https://msrc.microsoft.com/update-guide/releaseNote/2023-Mar
• https://msrc.microsoft.com/update-guide/deployments

1.0 Introduction

Recently, Microsoft has released updates to address multiple vulnerabilities in Microsoft software.

2.0 Impact
An attacker can exploit some of these vulnerabilities to take control of an affected system.

3.0 Affected Products

This release consists of security updates for the following products, features and roles.

• .NET and Visual Studio
• .NET Framework
• 3D Builder
• Azure App Service
• Azure Data Box Gateway
• Azure DevOps
• Azure Machine Learning
• HoloLens
• Internet Storage Name Service
• Microsoft Defender for Endpoint
• Microsoft Defender for IoT
• Microsoft Dynamics
• Microsoft Edge (Chromium-based)
• Microsoft Exchange Server
• Microsoft Graphics Component
• Microsoft Office
• Microsoft Office OneNote
• Microsoft Office Publisher
• Microsoft Office SharePoint
• Microsoft Office Word
• Microsoft PostScript Printer Driver
• Microsoft WDAC OLE DB provider for SQL
• Microsoft Windows Codecs Library
• Power BI
• SQL Server
• Visual Studio
• Windows Active Directory
• Windows ALPC
• Windows Common Log File System Driver
• Windows Cryptographic Services
• Windows Distributed File System (DFS)
• Windows Fax and Scan Service
• Windows HTTP.sys
• Windows Installer
• Windows iSCSI
• Windows Kerberos
• Windows MSHTML Platform
• Windows ODBC Driver
• Windows Protected EAP (PEAP)
• Windows SChannel
• Windows Win32K

4.0 Recommendations
MyCERT encourages users and administrators to review Microsoft’s February 2023 Security Update Guide and Deployment Information and apply the necessary updates.

• February 2023 Security Update Guide - https://msrc.microsoft.com/update-guide/releaseNote/2023-Feb
• Deployment Information - https://msrc.microsoft.com/update-guide/deployments

Generally, MyCERT advises the users of this devices to be updated with the latest security announcements by the vendor and follow best practice security policies to determine which updates should be applied.

For further enquiries, please contact MyCERT through the following channels:

E-mail: cyber999[at]cybersecurity.my 
Phone: 1-300-88-2999 (monitored during business hours) 
Mobile: +60 19 2665850 (24x7 call incident reporting) 
Business Hours: Mon - Fri 09:00 -18:00 MYT 
Web: https://www.mycert.org.my 
Twitter: https://twitter.com/mycert 
Facebook: https://www.facebook.com/mycert.org.my

5.0    References
https://www.cisa.gov/uscert/ncas/current-activity/2023/02/14/microsoft-releases-february-2023-security-updates

1.0 Introduction

Recently, Microsoft has released updates to address multiple vulnerabilities in Microsoft software.

2.0 Impact
An attacker could exploit some of these vulnerabilities to take control of an affected system.

3.0 Affected Products
Various Microsoft products and software are affected including, but not limited to:

• NET Core
• 3D Builder
• Azure Service Fabric Container
• Microsoft Bluetooth Driver
• Microsoft Edge (Chromium-based)
• Microsoft Exchange Server
• Microsoft Graphics Component
• Microsoft Local Security Authority Server (lsasrv)
• Microsoft Message Queuing
• Microsoft Office
• Microsoft Office SharePoint
• Microsoft Office Visio
• Microsoft WDAC OLE DB provider for SQL
• Visual Studio Code
• Windows ALPC
• Windows Ancillary Function Driver for WinSock
• Windows Authentication Methods
• Windows Backup Engine
• Windows Bind Filter Driver
• Windows BitLocker
• Windows Boot Manager
• Windows Credential Manager
• Windows Cryptographic Services
• Windows DWM Core Library
• Windows Error Reporting
• Windows Event Tracing
• Windows IKE Extension
• Windows Installer
• Windows Internet Key Exchange (IKE) Protocol
• Windows iSCSI
• Windows Kernel
• Windows Layer 2 Tunneling Protocol
• Windows LDAP - Lightweight Directory Access Protocol
• Windows Local Security Authority (LSA)
• Windows Local Session Manager (LSM)
• Windows Malicious Software Removal Tool
• Windows Management Instrumentation
• Windows MSCryptDImportKey
• Windows NTLM
• Windows ODBC Driver
• Windows Overlay Filter
• Windows Point-to-Point Tunneling Protocol
• Windows Print Spooler Components
• Windows Remote Access Service L2TP Driver
• Windows RPC API
• Windows Secure Socket Tunneling Protocol (SSTP)
• Windows Smart Card
• Windows Task Scheduler
• Windows Virtual Registry Provider
• Windows Workstation Service

4.0 Recommendations
MyCERT encourages users and administrators to review Microsoft’s January 2023 Security Update Guide and Deployment Information and apply the necessary updates.

Kindly refer to the following URL for more information:

• https://msrc.microsoft.com/update-guide/releaseNote/2023-Jan
• https://msrc.microsoft.com/update-guide/deployments

Generally, MyCERT advises the users of this devices to be updated with the latest security announcements by the vendor and follow best practice security policies to determine which updates should be applied.

For further enquiries, please contact MyCERT through the following channels:

E-mail: cyber999[at]cybersecurity.my 
Phone: 1-300-88-2999 (monitored during business hours) 
Mobile: +60 19 2665850 (24x7 call incident reporting) 
Business Hours: Mon - Fri 09:00 -18:00 MYT 
Web: https://www.mycert.org.my 
Twitter: https://twitter.com/mycert 
Facebook: https://www.facebook.com/mycert.org.my

5.0    References

• https://www.cisa.gov/uscert/ncas/current-activity/2023/01/10/microsoft-releases-january-2023-security-updates
• https://msrc.microsoft.com/update-guide/releaseNote/2023-Jan
• https://msrc.microsoft.com/update-guide/deployments

1.0 Introduction

Microsoft has released updates to address multiple vulnerabilities in Microsoft software.

2.0 Impact
An attacker can exploit some of these vulnerabilities to take control of an affected system.

3.0 Affected Products
This release consists of security updates for the following products, features and roles.

• .NET Framework
• Azure
• Client Server Run-time Subsystem (CSRSS)
• Microsoft Bluetooth Driver
• Microsoft Dynamics
• Microsoft Edge (Chromium-based)
• Microsoft Graphics Component
• Microsoft Office
• Microsoft Office OneNote
• Microsoft Office Outlook
• Microsoft Office SharePoint
• Microsoft Office Visio
• Microsoft Windows Codecs Library
• Role: Windows Hyper-V
• SysInternals
• Windows Certificates
• Windows Contacts
• Windows DirectX
• Windows Error Reporting
• Windows Fax Compose Form
• Windows HTTP Print Provider
• Windows Kernel
• Windows PowerShell
• Windows Print Spooler Components
• Windows Projected File System
• Windows Secure Socket Tunneling Protocol (SSTP)
• Windows SmartScreen
• Windows Subsystem for Linux
• Windows Terminal

4.0 Recommendations
MyCERT encourages users and administrators to review Microsoft’s December 2022 Security Update Guide and Deployment Information and apply the necessary updates.

Kindly refer to the following URLs:

• https://msrc.microsoft.com/update-guide/releaseNote/2022-Dec
• https://msrc.microsoft.com/update-guide/deployments

Generally, MyCERT advises the users of these devices to be updated with the latest security announcements by the vendor and follow best practice security policies to determine which updates should be applied.

For further enquiries, please get in touch with MyCERT through the following channels:

E-mail: cyber999[at]cybersecurity.my 
Phone: 1-300-88-2999 (monitored during business hours) 
Mobile: +60 19 2665850 (24x7 call incident reporting) 
Business Hours: Mon - Fri 09:00 -18:00 MYT 
Web: https://www.mycert.org.my 
Twitter: https://twitter.com/mycert 
Facebook: https://www.facebook.com/mycert.org.my

5.0    References

• https://www.cisa.gov/uscert/ncas/current-activity/2022/12/13/microsoft-releases-december-2022-security-updates
• https://msrc.microsoft.com/update-guide/releaseNote/2022-Dec
• https://msrc.microsoft.com/update-guide/deployments
   

1.0 Introduction
Two zero-day vulnerabilities affecting Microsoft Exchange Server were reported recently this week. As of writing, Microsoft is already aware of the issue and is working on releasing a fix soon and providing temporary workarounds in the meantime. 

The first vulnerability, identified as CVE-2022-41040, is a Server-Side Request Forgery (SSRF) vulnerability, while the second, identified as CVE-2022-41082, allows remote code execution (RCE) when PowerShell is accessible to the attacker. 

2.0 Impact
CVE-2022-41040 can enable an authenticated attacker to trigger CVE-2022-41082 remotely in these attacks. While CVE-2022-41082 allows remote code execution (RCE) when PowerShell is accessible to the attacker. It should be noted that authenticated access to the vulnerable Exchange Server is necessary to exploit either of the two vulnerabilities successfully. 

3.0 Affected System and Devices
The affected Microsoft products are Microsoft Exchange Server 2013, 2016, and 2019.

4.0 Recommendations
Users and administrators of the affected Microsoft Exchange products are advised to follow and apply the mitigation steps based on the guide below while waiting for a patch to be released by Microsoft. Microsoft Exchange Online Customers do not need to take any action. On-premises Microsoft Exchange customers should review and apply the following URL Rewrite Instructions and block exposed Remote PowerShell ports. 

The current mitigation is to add a blocking rule in “IIS Manager -> Default Web Site -> Autodiscover -> URL Rewrite -> Actions” to block the known attack patterns. 

Microsoft has confirmed that the following URL Rewrite Instructions, which are currently being discussed publicly, are successful in breaking current attack chains. The steps are as below:

• Open the IIS Manager. 
• Expand the Default Web Site. 
• Select Autodiscover. 
• In the Feature View, click URL Rewrite. 

• In the Actions pane on the right-hand side, click Add Rules.  

• Select Request Blocking and click OK. 

• Add String “.*autodiscover\.json.*\@.*Powershell.*” (excluding quotes) and click OK. 

• Expand the rule and select the rule with the Pattern “.*autodiscover\.json.*\@.*Powershell.*” and click Edit under Conditions. 

• Change the condition input from {URL} to {REQUEST_URI}