More Details About CVE-2014-4073 Elevation of Privilege Vulnerability

Today Microsoft shipped MS14-057 to the .NET Framework in order to resolve an Elevation of Privilege vulnerability in the ClickOnce deployment service. While this update fixes this service, developers using Managed Distributed Component Object Model a .NET wrapped around DCOM need to take immedia...

Security Analysis of CHERI ISA

Is it possible to get to a state where memory safety issues would be deterministically mitigated? Our quest to mitigate memory corruption vulnerabilities led us to examine CHERI Capability Hardware Enhanced RISC Instructions, which provides memory protection features against many exploited...

The Safety Boat: Kubernetes and Rust

Our team, DeisLabs, recently released a new piece of software called Krustlet, which is a tool for running WebAssembly modules on the popular, open-source container management tool called Kubernetes. Kubernetes is used quite extensively to run cloud software across many vendors and companies and ...

Congratulations to the MSRC 2025 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 Most Valuabl...

Toward greater transparency: Unveiling Cloud Service CVEs

Welcome to the second installment in our series on transparency at the Microsoft Security Response Center MSRC. In this ongoing discussion, we discuss our commitment to provide comprehensive vulnerability information to our customers. At MSRC, our mission is to protect our customers, communities,...

Congratulations to the Top MSRC 2023 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 2023 Q4 Security Researcher Leaderboard are Yuki Chen,...

Announcing the Security Researcher Quarterly Leaderboard

Right before Black Hat USA 2019, we announced our new researcher recognition program, and at Black Hat we announced the top researchers from the previous twelve months. Since it’s easier to track your progress with regular updates than with just an annual report, we are excited to announce the MS...

BlueHat India Call for Papers is Now Open!

You asked for it and it’s finally here! The inaugural BlueHat India conference will be held May 16-17th, 2024, in Hyderabad, India! This intimate conference will bring together a unique blend of security researchers and responders, who come together as peers to exchange ideas, experiences, and...

Service Fabric Privilege Escalation from Containerized Workloads on Linux

Under Coordinated Vulnerability Disclosure CVD, cloud-security vendor Palo Alto Networks informed Microsoft of an issue affecting Service Fabric SF Linux clusters CVE-2022-30137. The vulnerability enables a bad actor, with access to a compromised container, to escalate privileges and gain control...

Guidance for CVE-2022-23278 spoofing in Microsoft Defender for Endpoint

Microsoft released a security update to address CVE-2022-23278 in Microsoft Defender for Endpoint. This important class spoofing vulnerability impacts all platforms. We wish to thank Falcon Force for the collaboration on addressing this issue through coordinated vulnerability disclosure...

Introducing Bounty Awards for Teams Mobile Applications Security Research

We are pleased to announce the addition of Microsoft Teams mobile applications to the Microsoft Applications Bounty Program. Through the expanded program we welcome researchers from across the globe to seek out and disclose any high impact security vulnerabilities they may find in Teams mobile...

Continuing to Listen: Good News about the Security Update Guide API!

Based on user feedback we have simplified programmatic access to the security update data by removing the authentication and API-Key requirements when using the CVRF API. You will no longer have to log in to obtain a personal API key to access the data. Were happy to make this valuable public...

Machine Learning Security Evasion Competition 2020 Invites Researchers to Defend and Attack

Machine learning ML is an increasingly valuable tool in cyber security as adversaries continually evolve their tactics and techniques to evade detection. As machine learning has advanced and sophisticated ML models have been developed to assist security professionals in protecting the cloud,...

Microsoft resolves four SSRF vulnerabilities in Azure cloud services

Summary Microsoft recently fixed a set of Server-Side Request Forgery SSRF vulnerabilities in four Azure services Azure API Management, Azure Functions, Azure Machine Learning, and Azure Digital Twins reported by Orca Security. These SSRF vulnerabilities were determined to be low risk as they do...

Multiple Security Updates Affecting TCP/IP:  CVE-2021-24074, CVE-2021-24094, and CVE-2021-24086

Today Microsoft released a set of fixes affecting Windows TCP/IP implementation that include two Critical Remote Code Execution RCE vulnerabilities CVE-2021-24074, CVE-2021-24094 and an Important Denial of Service DoS vulnerability CVE-2021-24086. The two RCE vulnerabilities are complex which mak...

Building Faster AMD64 Memset Routines

Over the past several years, Microsoft has rolled out several changes that result in more memory being zeroed. These mitigations include: The InitAll mitigation which zeros most stack variables Switching most Microsoft kernel code over to the ExAllocatePool2/ExAllocatePool3 API’s which zero memor...

Congratulating Our Top 2020 Q1 Security Researchers!

Following the second Security Researcher Quarterly Leaderboard and the 2020 MSRC Most Valuable Security Researchers criteria we published in February 2020, we are excited to announce the 2020 First Quarter Q1 Security Researcher Leaderboard, listing our top contributing researchers for the last...

Mitigating SSRF Vulnerabilities Impacting Azure Machine Learning

Summary On May 9, 2024, Microsoft successfully addressed multiple vulnerabilities within the Azure Machine Learning AML service, which were initially discovered by security research firms Wiz and Tenable. These vulnerabilities, which included Server-Side Request Forgeries SSRF and a path traversa...

Awareness and guidance related to potential Service Fabric Explorer (SFX) v1 web client risk

Summary Microsoft was recently made aware of a Cross-Site Scripting XSS vulnerability CVE-2022-35829, that under limited circumstances, affects older versions of Service Fabric Explorer SFX. The current default SFX web client SFXv2 is not vulnerable to this attack. However, customers can manually...

Black Hat 2020: See you in the Cloud!

It hardly feels like summer without the annual trip to Las Vegas for Black Hat USA. With this year’s event being totally cloud based, we won’t have the chance to catch up with security researchers, industry partners, and customers in person, an opportunity we look forward to every year. We’ll sti...

Recognizing Security Researchers in 2020

Is it too early to talk about the 2020 MSRC Most Valuable Security Researchers? Five months from now, at the end of June, the program period closes for researchers to be considered for inclusion in the Most Valuable Researchers list. The top researcher list will be revealed at Black Hat North...

Customer Guidance for the Dopplepaymer Ransomware

Microsoft has been investigating recent attacks by malicious actors using the Dopplepaymer ransomware. There is misleading information circulating about Microsoft Teams, along with references to RDP BlueKeep, as ways in which this malware spreads. Our security research teams have investigated and...

Prevent the impact of a Linux worm by updating Exim (CVE-2019-10149)

This week, MSRC confirmed the presence of an active Linux worm leveraging a critical Remote Code Execution RCE vulnerability, CVE-2019-10149, in Linux Exim email servers running Exim version 4.87 to 4.91. Microsoft Azure infrastructure and Services are not affected; only customer’s Linux IaaS...

Improved Guidance for Azure Network Service Tags

Summary Microsoft Security Response Center MSRC was notified in January 2024 by our industry partner, Tenable Inc., about the potential for cross-tenant access to web resources using the service tags feature. Microsoft acknowledged that Tenable provided a valuable contribution to the Azure...

Potential Risk of Privilege Escalation in Azure AD Applications

Summary 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 t...

Guidance related to Secure Boot Manager changes associated with CVE-2023-24932

Summary Today, Microsoft is releasing CVE-2023-24932, and associated configuration guidance, to address a Secure Boot bypass vulnerability used by the BlackLotus bootkit to exploit CVE-2022-21894. Customers will need to closely follow the configuration guidance to fully protect against this...

Randomizing the KUSER_SHARED_DATA Structure on Windows

Windows 10 made a lot of improvements in Kernel Address Space Layout Randomization KASLR that increases the cost of exploitation, particularly for remote code execution exploits. Many kernel virtual address space VAS locations including kernel stacks, pools, system PTEs etc. are randomized. A...

Access Misconfiguration for Customer Support Database

Today, we concluded an investigation into a misconfiguration of an internal customer support database used for Microsoft support case analytics. While the investigation found no malicious use, and although most customers did not have personally identifiable information exposed, we want to be...

Microsoft Identity Bounty Improvements

Sharing the latest updates to the Microsoft Identity Bounty Program The post Microsoft Identity Bounty Improvements appeared first on Microsoft Security Response Center...

May 2019 Security Update Release

Today, we released security updates to provide additional protections against malicious attackers. As a best practice, we encourage customers to turn on automatic updates. More information about this month’s security updates can be found on the Security Update Guide...

Congratulations to the Top MSRC 2022 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 2022 Q4 Security Researcher Leaderboard are:...

A new experience for reporting copyright or trademark infringement on Microsoft Services

The Notice of Copyright or Trademark Infringement Portal has helped protect Microsofts users and customers from intellectual property infringement across online services like Microsoft Azure, Office, Outlook, Skype, Stream, Microsoft News, Sway, Hotmail, NuGet, and Yammer. Microsofts response to...

Assessing risk for the May 2014 security updates

Today we released eight security bulletins addressing 13 unique CVE’s. Two bulletins have a maximum severity rating of Critical while the other six have a maximum severity rating of Important. The table is designed to help you prioritize the deployment of updates appropriately for your environmen...

Azure Serial Console Attack and Defense - Part 2

This is the second installment of the Azure Serial Console blog, which provides insights to improve defenders’ preparedness when investigating Azure Serial Console activity on Azure Linux virtual machines. While the first blog post discussed various tracing activities, such as using Azure activit...

Service Fabric Privilege Escalation from Containerized Workloads on Linux

Under Coordinated Vulnerability Disclosure CVD, cloud-security vendor Palo Alto Networks informed Microsoft of an issue affecting Service Fabric SF Linux clusters CVE-2022-30137. The vulnerability enables a bad actor, with access to a compromised container, to escalate privileges and gain control...

Announcing the Top MSRC 2020 Q3 Security Researchers

Following the MSRC’s 2020 Most Valuable Security Researchers announced during this year’s Black Hat, we’re excited to announce the top contributing researchers for the 2020 Third Quarter Q3! The top three researchers of the 2020 Q3 Security Researcher Leaderboard are: David Dworken 1800 points,...

July 2020 Security Update: CVE-2020-1350 Vulnerability in Windows Domain Name System (DNS) Server

Today we released an update for CVE-2020-1350, a Critical Remote Code Execution RCE vulnerability in Windows DNS Server that is classified as a ‘wormable’ vulnerability and has a CVSS base score of 10.0. This issue results from a flaw in Microsoft’s DNS server role implementation and affects all...

January 2020 security updates are available!

We have released the January security updates to provide additional protections against malicious attackers. As a best practice, we encourage customers to turn on automatic updates. More information about this month’s security updates can be found in the Security Update Guide. As a reminder,...

September 2019 Security Updates

We have released the September security updates to provide additional protections against malicious attackers. As a best practice, we encourage customers to turn on automatic updates. More information about this month’s security updates can be found in the Security Update Guide. As a reminder,...

Recognizing Q4 Top 5 Bounty Hunters

We have tabulated the results from April-June 2018. The Top 5 Bounty Hunters for Q4 are now in. As with our list from Q3, we want to recognize both the leaders in payouts and in number of successful submissions. We appreciate the hard work and dedication of the following individuals and companies...

Congratulations to the top MSRC 2026 Q2 security researchers!

Congratulations to the researchers recognized in the MSRC 2026 Q2 Security Researcher Leaderboard. This quarter marks the final quarterly points-based leaderboard as we transition to our updated researcher recognition program. We are grateful for the contributions of the security research communi...

Additional Guidance Regarding OMI Vulnerabilities within Azure VM Management Extensions

Last updated on October 5, 2021: See revision history located at the end of the post for changes. On September 14, 2021, Microsoft released fixes for three Elevation of Privilege EoP vulnerabilities and one unauthenticated Remote Code Execution RCE vulnerability in the Open Management...

January 2020 Security Updates: CVE-2020-0601

The January security updates include several Important and Critical security updates. As always, we recommend that customers update their systems as quickly as practical. Details for the full set of updates released today can be found in the Security Update Guide. We believe in Coordinated...

June 2018 Security Update Release

Today, we released security updates to provide additional protections against malicious attackers. As a best practice, we encourage customers to turn on automatic updates. More information about this month’s security updates can be found on the Security Update Guide. MSRC team...

2017 年 10 月のセキュリティ更新プログラム (月例)

2017/10/17 更新 本日、ADV170016 が廃止され、CVE-2017-13080が 2017 年 10 月のセキュリティ リリ...

From sixteen to methodical: Firas Fatnassi’s evolution as a security researcher

Firas has been interested in technology for as long as he can remember. Growing up in Tunisia, he was drawn to mobile phones, gaming consoles, and anything that hinted at how systems worked beneath the surface. But for a long time, security research did not feel accessible...

Investigation Regarding Misconfigured Microsoft Storage Location

October 28, 2022 update: Added a Customer FAQ section. Summary 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...

Awareness and guidance related to potential Service Fabric Explorer (SFX) v1 web client risk

Summary Summary Microsoft was recently made aware of a Cross-Site Scripting XSS vulnerability CVE-2022-35829, that under limited circumstances, affects older versions of Service Fabric Explorer SFX. The current default SFX web client SFXv2 is not vulnerable to this attack. However, customers can...

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...

Exploring a New Class of Kernel Exploit Primitive

The security landscape is dynamic, changing often and as a result, attack surfaces evolve. MSRC receives a wide variety of cases spanning different products, bug types and exploit primitives. One particularly interesting primitive we see is an arbitrary kernel pointer read. These often happen whe...