1372 matches found
New MSRC Blog Site
We are excited to announce the release of the new Microsoft Security Response Center MSRC blog site. Please visit msrc.microsoft.com/blog/starting February 9th, 2023, for all past and future MSRC blog content. In addition to the new URL, we have refreshed the site with a new look and improved sit...
Investigation Regarding Misconfigured Microsoft Storage Location
October 28, 2022 update:Added a Customer FAQ section. Summary Security researchers at SOCRadar informed Microsoft on September 24, 2022, of a misconfigured Microsoft endpoint. This misconfiguration resulted in the potential for unauthenticated access to some business transaction data correspondin...
Defense-in-Depth Updates for Azure Identity libraries and Azure Key Vault libraries within Azure SDK plus Best Practice Implementation Guidance
Summary Today, Microsoft released new versions of the Azure Key Vault libraries and Azure Identity libraries as part of the Azure Software Development Kit SDK that includes defense-in-depth feature improvements. We also published best practice guidance to help protect applications and services th...
Researcher Spotlight: Hector Peralta’s Evolution from Popcorn Server to the MSRC Leaderboards
“The bug bounty literally changed my life. Before this, I had nothing.” Coolest thing he purchased: His first vehicle! Best gift to give: Buying his nephew gaming accessories. Favorite Hacking Companion: His two cats. They’re always by his side when he is working late. Origin of his Hacker name:...
Solving Uninitialized Stack Memory on Windows
This blog post outlines the work that Microsoft is doing to eliminate uninitialized stack memory vulnerabilities from Windows and why we’re on this path. This blog post will be broken down into a few parts that folks can jump to: Uninitialized Memory Background Potential Solutions to Uninitialize...
Inside the MSRC – Anatomy of a SSIRP incident
This is the second in a series of blog posts that shares how the MSRC responds to elevated threats to customers through the Software and Services Incident Response Plan SSIRP. In ourlast blog post, we looked at the history of the Microsoft Security Response Center and SSIRP, and how Microsoft tak...
Clarifying the behavior of mandatory ASLR
Last week, the CERT/CC published an advisory describing some unexpected behavior they observed when enabling system-wide mandatory Address Space Layout Randomization ASLR using Windows Defender Exploit Guard WDEG and EMET on Windows 8 and above. In this blog post, we will explain the configuratio...
Customer guidance for SharePoint vulnerability CVE-2025-53770
Revision Change Date 1.0 Information published 07/19/25 2.0 Clarified affected SharePoint product in summary 07/20/25 Added fix availability guidance Provided additional protections guidance regarding: Upgrade SharePoint products to supported versions if required Install July 2025 Security Update...
Announcing BlueHat 2024: Call for Papers now open
The 23rd edition of Microsoft’s BlueHat security conference will be hosted by the Microsoft Security Response Center MSRC at the Redmond, WA corporate campus, October 29 and 30, 2024. BlueHat brings together security researchers and responders from both inside and outside of Microsoft, who come...
Announcing the CVRF API 3.0 upgrade
At the Microsoft Security Response Center, we are committed to continuously improving the security and performance of our services to meet the evolving needs of our customers. We are excited to announce the rollout of the latest version of our Common Vulnerability Reporting CVRF API. This update...
Embracing innovation: Derrick’s transition from banking to Microsoft’s Threat Intelligence team
Meet Derrick, a Senior Program Manager on the Operational Threat Intelligence team at Microsoft. Derrick’s role involves understanding and roadmapping the complete set of tools that Threat Intel analysts use to collect, analyze, process, and disseminate threat intelligence across Microsoft...
Hey Yara, find some vulnerabilities
Intro Intro Finding vulnerabilities in software is no easy task by itself. Doing this at cloud scale is very challenging to perform manually, and we use tools to help us identify patterns or vulnerability signatures. Yara is one of those tools. Yara is a very popular tool with Blue teams, malware...
Azure ADを使用するマルチテナント アプリケーションの承認に関する構成ミスの可能性に関するガイダンス
本ブログは、Guidance on Potential Misconfiguration of Authorization of Multi-Tenant Applications that use Azure AD の抄訳版です。最新の情報は原文を参照してください...
BlueHat 2023 Call for Papers is Now Open!
For nearly 20 years, BlueHat has been where the security research community, and Microsoft security professionals come together as peers, to share, debate, challenge, learn, and exchange ideas in the interest of creating a safer and more secure world for all. We are extremely excited to announce...
Vulnerability Fixed in Azure Synapse Spark
Summary Summary Microsoft takes a proactive approach to continually probe our defenses, hunt for vulnerabilities, and seek new, innovative ways to protect our customers. Security researchers are an important part of this effort, and our collaborative partnership is critical in a world where...
Congratulations to the Top MSRC 2022 Q2 Security Researchers!
Congratulations to all the researchers recognized in this quarter’s Microsoft Researcher Recognition Program leaderboard! Thank you to everyone for your hard work and continued partnership to secure customers. The top three researchers of the 2022 Q2 Security Researcher Leaderboard are: Yuki Chen...
A Man of Action: Meet Callum Carney
Hidden Talents: He was a competitive swimmer for many years. Instrument of Choice: His fingers were made for the keyboard, but he used to play the trumpet. 5 pieces of entertainment for the rest of his life: The Office, World War Z, The Matrix, Breaking Bad, The Thick of It. Favorite non-profit:...
Increasing Representation of Women in Security Research
Microsoft is committed to partnering with and supporting women in security research. Whether it’s growing women early in their career, or connecting people with mentors, we want to be a part of the journey. Throughout Womens History Month we intentionally sought opportunities to engage with women...
Calling for security research in Azure Sphere, now generally available
Today, Microsoft released Azure Sphere into General Availability GA. Azure Sphere’s mission is to empower every organization on the planet to connect and create secured and trustworthy IoT devices. Azure Sphere is an end-to-end solution for securely connecting existing equipment and for creating...
Analysis and mitigation of speculative store bypass (CVE-2018-3639)
In January, 2018, Microsoft published an advisory and security updates for a new class of hardware vulnerabilities involving speculative execution side channels known as Spectre and Meltdown. In this blog post, we will provide a technical analysis of an additional subclass of speculative executio...
Azure Serial Console Attack and Defense - Part 1
Ever had a virtual machine crash? Azure Serial console is a great way to directly connect to your Virtual machine and debug what went wrong. Azure Serial Console is a feature that's available for free for everyone. While the primary intent of this feature is to assist users debug their machine,...
From Bounty Leaderboards to Microsoft Security Researcher, Meet Cameron Vincent!
Fun Facts: Game you binged: Guitar Hero and Rock Band fanatic. Go to snack: Nutri-Grain Bars. Favorite Drink: Soda – Coca Cola specifically. Favorite Place: Singapore – stayed an extra week after a hacking collaboration and truly fell in love and hopes to get back as soon as possible. Favorite...
Breaking Barriers: Aditi’s Journey Through Sight Loss to Microsoft AI Innovator
Facts about Aditi Shah: Tools she uses: Aditi’s main tool is JAWS, a screen reader from Freedom Scientific, which she touts as the best in the market. This tool has made her digital life more manageable, enabling her to perform almost any task independently. Aditi also uses Seeing AI, a Microsoft...
Microsoft Response to Layer 7 Distributed Denial of Service (DDoS) Attacks
Summary Summary Beginning in early June 2023, Microsoft identified surges in traffic against some services that temporarily impacted availability. Microsoft promptly opened an investigation and subsequently began tracking ongoing DDoS activity by the threat actor that Microsoft tracks as...
マイクロソフトのオンラインサービスにおける、脆弱性の深刻度分類の公開
本ブログは、Microsoft Vulnerability Severity Classification for Online Services Publication の抄訳版です。最新の情報は原文を参照してください。 マイク...
Microsoft Investigation - Threat actor consent phishing campaign abusing the verified publisher process
Summary Summary On December 15th, 2022, Microsoft became aware of a consent phishing campaign involving threat actors fraudulently impersonating legitimate companies when enrolling in the Microsoft Cloud Partner Program MCPP formerly known as Microsoft Partner Network MPN. The actor used fraudule...
セキュリティ更新プログラムガイド CVRF API での CBL-Mariner CVE の 公開について
本ブログは、Publishing CBL-Mariner CVEs on the Security Update Guide CVRF API の抄訳版です。最新の情報は原文を参照してください。...
Building the Azure IoT Edge Security Daemon in Rust
Azure IoT Edge is an open source, cross platform software project from the Azure IoT team at Microsoft that seeks to solve the problem of managing distribution of compute to the edge of your on-premise network from the cloud. This post explains some of the rationale behind our choice of Rust as t...
Why XSS still matters: MSRC’s perspective on a 25-year-old threat
Cross-Site Scripting XSS has been a known vulnerability class for two decades, yet it continues to surface in modern applications, including those built with the latest frameworks and cloud-native architectures. At Microsoft, we still receive a steady stream of XSS reports across our services, fr...
Congratulations to the Top MSRC 2024 Q2 Security Researchers!
Congratulations to all the researchers recognized in this quarter’s Microsoft Researcher Recognition Program leaderboard! Thank you to everyone for your hard work and continued partnership to secure customers. The top three researchers of the 2024 Q2 Security Researcher Leaderboard are Yuki Chen,...
Microsoft boosts its Microsoft 365 Insider Builds on Windows Bounty Program with higher awards and an expanded scope
Starting today, we are doubling the maximum bounty award for the Microsoft 365 Insider Bug Bounty Program to $30,000 USD for high impact scenarios, such as unauthenticated non-sandboxed code execution with no user interaction. We are also expanding the scope of our bounty program to include more...
Reflecting on 20 years of Patch Tuesday
This year is a landmark moment for Microsoft as we observe the 20th anniversary of Patch Tuesday updates, an initiative that has become a cornerstone of the IT world’s approach to cybersecurity. Originating from the Trustworthy Computing memo by Bill Gates in 2002, our unwavering commitment to...
Microsoft Response to Distributed Denial of Service (DDoS) Attacks against HTTP/2
Summary Beginning in September 2023, Microsoft was notified by industry partners about a newly identified Distributed Denial-of-Service DDoS attack technique being used in the wild targeting HTTP/2 protocol. This vulnerability CVE-2023-44487 impacts any internet exposed HTTP/2 endpoints. As an...
Journey Down Under: How Rocco Became Australia’s Premier Hacker
Fun facts about Rocco Calvi @TecR0c: Microsoft MVR: Rocco is a 2023 Microsoft Most Valuable Researcher. Fitness fanatic: Inspired by old-school body building and countless hours of chopping and carrying wood in the mountains during his youth, Rocco remains a fitness enthusiast, setting himself...
Updating our Vulnerability Severity Classification for AI Systems
The Microsoft Security Response Center MSRC is always looking for ways to provide clarity and transparency around how we assess the impact of vulnerabilities reported in our products and services. To this end, we are announcing the Microsoft Vulnerability Severity Classification for AI Systems, a...
What to expect when reporting vulnerabilities to Microsoft
At the Microsoft Security Response Center MSRC, our mission is to protect our customers, communities, and Microsoft from current and emerging threats to security and privacy. One way we achieve this is by working with security researchers to identify and fix security vulnerabilities in our servic...
Congratulations to the Top MSRC 2023 Q2 Security Researchers!
Congratulations to all the researchers recognized in this quarter’s Microsoft Researcher Recognition Program leaderboard! Thank you to everyone for your hard work and continued partnership to secure customers. The top three researchers of the 2023 Q2 Security Researcher Leaderboard are: Yuki Chen...
Potential Risk of Privilege Escalation in Azure AD Applications
Summary Microsoft has developed mitigations for an insecure anti-pattern used in Azure AD AAD applications highlighted by Descope, and reported to Microsoft, where use of the email claim from access tokens for authorization can lead to an escalation of privilege. An attacker can falsify the email...
Configuring host-level audit logging for AKS VMSS
This blog post runs you through how to enable and configure Linux audit logging on your Azure Kubernetes Service AKS Virtual Machine Scale Set VMSS using the Linux auditing subsystem, also known as auditd. Warning The information provided below is accurate as of the release date of this blog post...
An Armful of CHERIs
Today, Arm announced that the first silicon supporting the Morello prototype architecture, a research project led by Arm, Microsoft, University of Cambridge and others, is now available on a limited run of demonstration boards, which are being shipped from today to industry partners for testing...
We’re Excited to Announce the Launch of Comms Hub!
We are excited to announce the launch of Comms Hub to the Researcher Portal submission experience! With this launch, security researchers will be able to streamline communication with MSRC case SPMs case managers, attach additional files, track case and bug bounty status all in the Researcher...
Concluding the Azure Sphere Security Research Challenge, Microsoft Awards $374,300 to Global Security Research Community
The Azure Sphere Security Research Challenge brought together 70 researchers from 21 countries to help secure Azure Sphere customers and expand Microsoft’s partnerships with the global IoT security research community. During the three-month Azure Sphere Security Research Challenge, researchers...
Congratulations to the MSRC’s 2020 Most Valuable Security Researchers
Today we announce our Most Valuable Security Researchers for 2020! The MSRC Researcher Recognition program is an integral aspect of recognizing the ongoing partnerships with our community of talented security researchers who report through Coordinated Vulnerability Disclosure CVD. These...
Vulnerability hunting with Semmle QL, part 1
Previously on this blog, we’ve talked about how MSRC automates the root cause analysis of vulnerabilities reported and found. After doing this, our next step is variant analysis: finding and investigating any variants of the vulnerability. It’s important that we find all such variants and patch...
February 2017 security update release
UPDATE: 2/15/17: We will deliver updates as part of the planned March Update Tuesday, March 14, 2017. Our top priority is to provide the best possible experience for customers in maintaining and protecting their systems. This month, we discovered a last minute issue that could impact some custome...
Mitigating NTLM Relay Attacks by Default
Introduction In February 2024, we released an update to Exchange Server which contained a security improvement referenced by CVE-2024-21410 that enabled Extended Protection for Authentication EPA by default for new and existing installs of Exchange 2019. While we’re currently unaware of any activ...
Microsoft guidance regarding credentials leaked to GitHub Actions Logs through Azure CLI
Summary The Microsoft Security Response Center MSRC was made aware of a vulnerability where Azure Command-Line Interface CLI could expose sensitive information, including credentials, through GitHub Actions logs. The researcher, from Palo Alto Networks Prisma Cloud, found that Azure CLI commands...
Congratulations to the MSRC 2023 Most Valuable Security Researchers!
The Microsoft Researcher Recognition Program offers public thanks and recognition to security researchers who help protect our customers through discovering and sharing security vulnerabilities under Coordinated Vulnerability Disclosure. Today, we are excited to recognize this year’s top 100 Most...