(Pwn2Own) Microsoft Windows CLFS Integer Underflow Local Privilege Escalation Vulnerability

This vulnerability allows local attackers to escalate privileges on affected installations of Microsoft Windows. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the Common Log Fil...

Microsoft Patches 61 Flaws, Including Two Actively Exploited Zero-Days

Microsoft has addressed a total of 61 new security flaws in its software as part of its Patch Tuesday updates for May 2024, including two zero-days which have been actively exploited in the wild. Of the 61 flaws, one is rated Critical, 59 are rated Important, and one is rated Moderate in severity...

Microsoft Common Log File System Elevation of Privilege Vulnerability

The Microsoft Common Log File System is Microsoft's Common Log File System CLFS API provides a log file subsystem that can be used by dedicated client applications and shared by multiple clients to optimize log access. Microsoft Common Log File System elevation of privilege vulnerability. An...

Microsoft's January 2024 Windows Update Patches 48 New Vulnerabilities

Microsoft has addressed a total of 48 security flaws spanning its software as part of its Patch Tuesday updates for January 2024. Of the 48 bugs, two are rated Critical and 46 are rated Important in severity. There is no evidence that any of the issues are publicly known or under active attack at...

Windows CLFS and five exploits used by ransomware operators (Exploit #3 – October 2022)

This is part four of our study about the Common Log File System CLFS and five vulnerabilities in this Windows OS component that have been used in ransomware attacks throughout the year. Please read the previous parts first if you havent already. You can skip to the other parts using this table of...

Windows CLFS and five exploits used by ransomware operators (Exploit #2 – September 2022)

This is the third part of our study about the Common Log File System CLFS and five vulnerabilities in this Windows OS component that have been used in ransomware attacks throughout the year. Please read the previous parts first if you havent already. You can skip to the other parts using this tab...

Windows CLFS and five exploits used by ransomware operators

In April 2023, we published a blog post about a zero-day exploit we discovered in ransomware attacks that was patched as CVE-2023-28252 after we promptly reported it to Microsoft. In that blog post, we mentioned that the zero-day exploit we discovered was very similar to other Microsoft Windows...

Windows CLFS and five exploits used by ransomware operators (Exploit #1 – CVE-2022-24521)

This is the second part of our study about the Common Log File System CLFS and five vulnerabilities in this Windows OS component that have been used in ransomware attacks throughout the year. Please read the previous part first if you havent already. You can skip to the other parts using this tab...

PT-2023-9403 · Microsoft · Windows 11 +5

Name of the Vulnerable Software and Affected Versions: Microsoft Windows 10, Windows 11, Windows Server 2016, Windows Server 2019, and Windows Server 2022 affected versions not specified Description: A Denial of Service in the CLFS.sys driver allows a malicious authenticated low-privilege user to...

Exploit for Integer Overflow or Wraparound in Microsoft

CVE-2023-36900 - About this vulnerability: https://msrc.micros...

Buffer Overflow

libzephyr.so is vulnerable to Buffer Overflows. The vulnerability is caused by the CLFS driver. An attacker is able to exploit this vulnerability by sending a specially crafted log file to a vulnerable system. If the log file is processed by the CLFS driver, the buffer overflow can be triggered,...

Microsoft Windows CLFS Out-Of-Bounds Read Information Disclosure Vulnerability

This vulnerability allows local attackers to disclose sensitive information on affected installations of Microsoft Windows. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the CLF...

Microsoft Windows CLFS Out-Of-Bounds Read Information Disclosure Vulnerability

This vulnerability allows local attackers to disclose sensitive information on affected installations of Microsoft Windows. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the...

Microsoft Windows CLFS Incorrect Integer Conversion Local Privilege Escalation Vulnerability

This vulnerability allows local attackers to escalate privileges on affected installations of Microsoft Windows. An attacker must first obtain the ability to execute low-privileged code on the target system in order to exploit this vulnerability. The specific flaw exists within the clfs.sys drive...

Exploit for Out-of-bounds Write in Microsoft

Since February 2022 was reported a new ransomware that appears t...

Microsoft Patch Tuesday April 2023: CLFS EoP, Word RCE, MSMQ QueueJumper RCE, PCL6, DNS, DHCP

Microsoft Patch Tuesday April 2023: CLFS EoP, Word RCE, MSMQ QueueJumper RCE, PCL6, DNS, DHCP. Hello everyone! This episode will be about Microsoft Patch Tuesday for April 2023, including vulnerabilities that were added between March and April Patch Tuesdays. Alternative video link for Russia:...

Update now! April’s Patch Tuesday includes a fix for one zero-day

Its Patch Tuesday again. Microsoft and other vendors have released their monthly updates. Among a total of 97 patched vulnerabilities there is one actively exploited zero-day. Microsoft classifies a vulnerability as a zero-day if it is publicly disclosed or actively exploited with no official fix...

Microsoft (& Apple) Patch Tuesday, April 2023 Edition

Microsoft today released software updates to plug 100 security holes in its Windows operating systems and other software, including a zero-day vulnerability that is already being used in active attacks. Not to be outdone, Apple has released a set of important updates addressing two zero-day...

Patch Tuesday - April 2023

Microsoft is offering fixes for 114 vulnerabilities for April 2023 Patch Tuesday. This month’s haul includes a single zero-day vulnerability, as well as seven critical Remote Code Execution RCE vulnerabilities. There is a strong focus on fixes for Windows OS this month. Zero-day vulnerability: CL...

Microsoft Windows Common Log File System (CLFS) Driver Privilege Escalation Vulnerability

Microsoft Windows Common Log File System CLFS driver contains an unspecified vulnerability that allows for privilege escalation...