Publishing CBL-Mariner CVEs on the Security Update Guide CVRF API

Microsoft is pleased to announce that beginning January 11, 2023, we will publish CBL-Mariner CVEs in the Security Update Guide SUG Common Vulnerability Reporting Framework CVRF API. CBL-Mariner is a Linux distribution built by Microsoft to power Azure’s cloud and edge products and services and i...

CVE-2022-23278 Microsoft Defender for Endpointのなりますましの脆弱性に関するガイダンス

本ブログは、Guidance for CVE-2022-23278 spoofing in Microsoft Defender for Endpoint 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...

Time for day 2 of briefings at BlueHat Seattle!

We hope you enjoyed the first day of our BlueHat briefings and the Bytes of BlueHat reception in our glamping tent complete with toasted marshmallows. Yesterday, we learned a lot about how XboxOne hardware security has advanced the state of hardware security elsewhere, we heard some surprising...

BlueHat Asia 2025: Closing soon: Submit your papers by September 14, 2025

The next chapter of the Microsoft Security Response Center’s MSRC BlueHat security conference is fast approaching. BlueHat Asia 2025 will take place in Bengaluru, India, on November 5 – 6, 2025 and the Call for Papers is now open. Submissions will be accepted through September 14, 2025. Now in it...

Azure AD アプリケーションにおける特権昇格の潜在的なリスクについて

本ブログは、Potential Risk of Privilege Escalation in Azure AD Applications の抄訳版です。最新の情報は原文を参照してください。 概要...

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...

Microsoft Mitigates Vulnerability in Jupyter Notebooks for Azure Cosmos DB

Summary Microsoft recently fixed an authentication bypass vulnerability in Jupyter Notebooks for Azure Cosmos DB currently in preview reported by Orca Security. Customers not using Jupyter Notebooks 99.8% of Azure Cosmos DB customers do NOT use Jupyter notebooks were not susceptible to this...

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...

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:...

Announcing MSRC 2019 Q4 Security Researcher Leaderboard

Following the first Security Researcher Quarterly Leaderboard we published in October 2019, we are excited to announce the MSRC Q4 2019 Security Researcher Leaderboard, which shows the top contributing researchers for the last quarter. In each quarterly leaderboard, we recognize the security...

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...

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...

The MSRC 2017 list of “Top 100” security researchers

Security researchers play an essential role in Microsoft’s security strategy and are key to community-based defense. To show our appreciation for their hard work and partnership, each year at BlackHat North America, the Microsoft Security Response Center highlights contributions of these...

CVE-2013-3893: Fix it workaround available

Today, we released a Fix it workaround tool to address a new IE vulnerability that had been actively exploited in extremely limited, targeted attacks. This Fix it makes a minor modification to mshtml.dll when it is loaded in memory to address the vulnerability. This Fix it workaround tool is link...

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...

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...

Results of Major Technical Investigations for Storm-0558 Key Acquisition

March 12, 2024 update As part of our continued commitment to transparency and trust outlined in Microsoft’s Secure Future Initiative, we are providing further information as it relates to our ongoing investigation. This new information does not change the customer guidance we previously shared, n...

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...

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...

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...

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。...

Security Update Guide Improvement – Representing Hotpatch Updates

Today we are updating the way Microsoft Security Update Guide SUG represents the Windows Hotpatch feature to make it easier for users to identify the hotpatch and security updates. Hotpatching was introduced a year ago as a new way to install updates on supported Windows Server Azure Edition...

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...

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:...

Announcing the Microsoft Identity Research Project Grant

We are excited to announce the Microsoft Identity Research Project Grant a new opportunity in partnership with the security community to help protect Microsoft customers. This project grant awards up to $75,000 USD for approved research proposals that improve the security of the Microsoft Identit...

Call for Papers | Microsoft BlueHat Shanghai 2019

The Microsoft Security Response Center MSRC recently announced our first BlueHat security conference in Shanghai which will take place on May 29-30, 2019. After 15 years of BlueHat events in Redmond, Washington and Israel, we are thrilled to expand to a new location. We work with many talented...

Congratulations to the Top MSRC 2024 Q4 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 Q4 Security Researcher Leaderboard are Suresh,...

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,...

Update on Microsoft Actions Following Attack by Nation State Actor Midnight Blizzard

This blog provides an update on the nation-state attack that was detected by the Microsoft Security Team on January 12, 2024. As we shared, on January 19, the security team detected this attack on our corporate email systems and immediately activated our response process. The Microsoft Threat...

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...

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...

Congratulations to the top MSRC 2025 Q4 security researchers!

Congratulations to all the researchers recognized in this quarter’sMicrosoft Researcher Recognition Programleaderboard! Thank you to everyone for your hard work and continued partnership to secure customers...

Congratulations to the Top MSRC 2024 Q3 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 Q3 Security Researcher Leaderboard are wkai,...

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...

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...

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...

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...

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...

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...

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...

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 correspondi...

Azure App Service Linux source repository exposure

MSRC was informed by Wiz.io, a cloud security vendor, under Coordinated Vulnerability Disclosure CVD of an issue where customers can unintentionally configure the .git folder to be created in the content root, which would put them at risk for information disclosure. This, when combined with an...

Update on the vulnerability in the Azure Cosmos DB Jupyter Notebook Feature

On August 12, 2021, a security researcher reported a vulnerability in the Azure Cosmos DB Jupyter Notebook feature that could potentially allow a user to gain access to another customers resources by using the accounts primary read-write key. We mitigated the vulnerability immediately. Our...

Control Flow Guard for Clang/LLVM and Rust

As part of our ongoing efforts towards safer systems programming, we’re pleased to announce that Windows Control Flow Guard CFG support is now available in the Clang C/C++ compiler and Rust. What is Control Flow Guard? CFG is a platform security technology designed to enforce control flow...

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...

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...

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...

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,...

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...