Trustwave SpiderLabs Uncovers Ov3r_Stealer Malware Spread via Phishing and Facebook Advertising. Learn More

Trustwave SpiderLabs Uncovers Ov3r_Stealer Malware Spread via Phishing and Facebook Advertising. Learn More

Managed Detection & Response

Eliminate active threats with 24/7 threat detection, investigation, and response.

Co-Managed SOC (SIEM)

Maximize your SIEM investment, stop alert fatigue, and enhance your team with hybrid security operations support.

Advisory & Diagnostics

Advance your cybersecurity program and get expert guidance where you need it most.

Penetration Testing

Test your physical locations and IT infrastructure to shore up weaknesses before exploitation.

Database Security

Prevent unauthorized access and exceed compliance requirements.

Email Security

Stop email threats others miss and secure your organization against the #1 ransomware attack vector.

Digital Forensics & Incident Response

Prepare for the inevitable with 24/7 global breach response in-region and available on-site.

Firewall & Technology Management

Mitigate risk of a cyberattack with 24/7 incident and health monitoring and the latest threat intelligence.

Microsoft Exchange Server Attacks
Stay protected against emerging threats
Rapidly Secure New Environments
Security for rapid response situations
Securing the Cloud
Safely navigate and stay protected
Securing the IoT Landscape
Test, monitor and secure network objects
Why Trustwave
About Us
Awards and Accolades
Trustwave SpiderLabs Team
Trustwave Fusion Security Operations Platform
Trustwave Security Colony
Technology Alliance Partners
Key alliances who align and support our ecosystem of security offerings
Trustwave PartnerOne Program
Join forces with Trustwave to protect against the most advance cybersecurity threats
SpiderLabs Blog

Patch Tuesday, January 2021

The first Patch Tuesday of 2021 is here and the year is starting out lighter than most. Perhaps a blessing for a year that doesn't seem to want to let up on all the... "drama" that started in 2020. In all Microsoft is patching ten vulnerabilities rated "Critical", 71 rated "Important", and two rated as "Moderate".

The critical list covers both GDI+ and video codec Remote Code Execution (RCE) vulnerabilities and half of the list cover RCE vulnerabilities in Remote Procedure Call (RPC) calls. The most severe on the Critical list is an RCE vulnerability in Microsoft Defender (CVE-2021-1647) the built-in Microsoft antimalware solution. A purposely crafted executable file could trigger a Remote Code Execution in Defender during scanning. These are a worst-case scenario for security professionals because the protections you are trying to put in place to protect your users bite you and becomes the vulnerability that causes a breach. Adding to the severity of this specific vulnerability is that this vulnerability is being patched as a zero-day with known public exploitation.

On the list of vulnerabilities rated "Important", there are four additional RPC RCE vulnerabilities. These are rated as a lesser severity due to the attack vector required to exploit them, however, the end result is the same: Arbitrary code executed at the whim of an attacker. The wide majority of vulnerabilities rated as "Important" are Privilege Escalation bugs and contains vulnerabilities in SharePoint, Windows Hyper-V, Windows WalletService, among others.

2021 has come in like a rabid weasel, but at least we can take some comfort in the fact that our January Patch Tuesday is relatively light. So let's get patching and stay safe out there!


GDI+ Remote Code Execution Vulnerability
Remote Code Execution

HEVC Video Extensions Remote Code Execution Vulnerability
Remote Code Execution

Microsoft Defender Remote Code Execution Vulnerability
Remote Code Execution

Microsoft DTV-DVD Video Decoder Remote Code Execution Vulnerability
Remote Code Execution

Microsoft Edge (HTML-based) Memory Corruption Vulnerability
Remote Code Execution

Remote Procedure Call Runtime Remote Code Execution Vulnerability
CVE-2021-1658, CVE-2021-1660, CVE-2021-1666, CVE-2021-1667, CVE-2021-1673
Remote Code Execution


.NET Core and Visual Studio Denial of Service Vulnerability
Denial of Service

Active Template Library Elevation of Privilege Vulnerability
Elevation of Privilege

Bot Framework SDK Information Disclosure Vulnerability
Information Disclosure

Diagnostics Hub Standard Collector Elevation of Privilege Vulnerability
CVE-2021-1651, CVE-2021-1680
Elevation of Privilege

HEVC Video Extensions Remote Code Execution Vulnerability
Remote Code Execution

Hyper-V Denial of Service Vulnerability
CVE-2021-1691, CVE-2021-1692
Denial of Service

Microsoft Excel Remote Code Execution Vulnerability
CVE-2021-1713, CVE-2021-1714
Remote Code Execution

Microsoft Office Remote Code Execution Vulnerability
Remote Code Execution

Microsoft SharePoint Elevation of Privilege Vulnerability
CVE-2021-1712, CVE-2021-1719
Elevation of Privilege

Microsoft SharePoint Server Remote Code Execution Vulnerability
Remote Code Execution

Microsoft SharePoint Server Tampering Vulnerability

Microsoft SharePoint Spoofing Vulnerability
CVE-2021-1641, CVE-2021-1717

Microsoft splwow64 Elevation of Privilege Vulnerability
Information Disclosure

Microsoft SQL Elevation of Privilege Vulnerability
Elevation of Privilege

Microsoft Windows Media Foundation Remote Code Execution Vulnerability
Remote Code Execution

Microsoft Word Remote Code Execution Vulnerability
CVE-2021-1715, CVE-2021-1716
Remote Code Execution

NTLM Security Feature Bypass Vulnerability
Security Feature Bypass

Remote Procedure Call Runtime Remote Code Execution Vulnerability
CVE-2021-1664, CVE-2021-1671, CVE-2021-1700, CVE-2021-1701
Remote Code Execution

TPM Device Driver Information Disclosure Vulnerability
Information Disclosure

Visual Studio Remote Code Execution Vulnerability
Remote Code Execution

Windows (modem.sys) Information Disclosure Vulnerability
Information Disclosure

Windows AppX Deployment Extensions Elevation of Privilege Vulnerability
CVE-2021-1642, CVE-2021-1685
Elevation of Privilege

Windows Bluetooth Security Feature Bypass Vulnerability
CVE-2021-1638, CVE-2021-1683, CVE-2021-1684
Security Feature Bypass

Windows CryptoAPI Denial of Service Vulnerability
Denial of Service

Windows CSC Service Elevation of Privilege Vulnerability
CVE-2021-1652, CVE-2021-1653, CVE-2021-1654, CVE-2021-1655, CVE-2021-1659, CVE-2021-1688, CVE-2021-1693
Elevation of Privilege

Windows DNS Query Information Disclosure Vulnerability
Information Disclosure

Windows Docker Information Disclosure Vulnerability
Information Disclosure

Windows Event Logging Service Elevation of Privilege Vulnerability
Elevation of Privilege

Windows Event Tracing Elevation of Privilege Vulnerability
Elevation of Privilege

Windows Fax Compose Form Remote Code Execution Vulnerability
Remote Code Execution

Windows GDI+ Information Disclosure Vulnerability
Information Disclosure

Windows Graphics Component Information Disclosure Vulnerability
Information Disclosure

Windows Hyper-V Elevation of Privilege Vulnerability
Elevation of Privilege

Windows Installer Elevation of Privilege Vulnerability
Elevation of Privilege

Windows InstallService Elevation of Privilege Vulnerability
Elevation of Privilege

Windows Kernel Elevation of Privilege Vulnerability
Elevation of Privilege

Windows LUAFV Elevation of Privilege Vulnerability
Elevation of Privilege

Windows Multipoint Management Elevation of Privilege Vulnerability
Elevation of Privilege

Windows NT Lan Manager Datagram Receiver Driver Information Disclosure Vulnerability
Information Disclosure

Windows Print Spooler Elevation of Privilege Vulnerability
Elevation of Privilege

Windows Projected File System FS Filter Driver Information Disclosure Vulnerability
CVE-2021-1663, CVE-2021-1670, CVE-2021-1672
Information Disclosure

Windows Remote Desktop Protocol Core Security Feature Bypass Vulnerability
Security Feature Bypass

Windows Remote Desktop Services ActiveX Client Security Feature Bypass Vulnerability
Security Feature Bypass

Windows Remote Procedure Call Runtime Elevation of Privilege Vulnerability
Elevation of Privilege

Windows Runtime C++ Template Library Elevation of Privilege Vulnerability
Elevation of Privilege

Windows WalletService Elevation of Privilege Vulnerability
CVE-2021-1681, CVE-2021-1686, CVE-2021-1687, CVE-2021-1690
Elevation of Privilege

Windows Win32k Elevation of Privilege Vulnerability
Elevation of Privilege

Windows WLAN Service Elevation of Privilege Vulnerability
Elevation of Privilege


Azure Active Directory Pod Identity Spoofing Vulnerability

Windows Update Stack Elevation of Privilege Vulnerability
Security Feature Bypass

Latest SpiderLabs Blogs

Hunting For Integer Overflows In Web Servers

Allow me to set the scene and start proceedings off with a definition of an integer overflow, according to Wikipedia:

Read More

Welcome to Adventures in Cybersecurity: The Defender Series

I’m happy to say I’m done chasing Microsoft certifications (AZ104/AZ500/SC100), and as a result, I’ve had the time to put some effort into a blog series that hopefully will entertain and inform you...

Read More

Trustwave SpiderLabs: Insights and Solutions to Defend Educational Institutions Against Cyber Threats

Security teams responsible for defending educational institutions at higher education and primary school levels often find themselves facing harsh lessons from threat actors who exploit the numerous...

Read More