CVE-2024-49138
published 2024-12-12CVE-2024-49138: Windows Common Log File System Driver Elevation of Privilege Vulnerability
PriorityP185high7.8CVSS 3.1
AVLACLPRLUINSUCHIHAH
KEVITWEXPLOIT
CISA Known Exploited Vulnerabilitydue 2024-12-31
Exploited in the wild
EPSS
25.41%
97.7th percentile
Windows Common Log File System Driver Elevation of Privilege Vulnerability
Affected
48 ranges· showing 25
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| microsoft | windows_10_1507 | < 10.0.10240.20857 | 10.0.10240.20857 |
| microsoft | windows_10_1607 | < 10.0.14393.7606 | 10.0.14393.7606 |
| microsoft | windows_10_1809 | < 10.0.17763.6659 | 10.0.17763.6659 |
| microsoft | windows_10_21h2 | < 10.0.19044.5247 | 10.0.19044.5247 |
| microsoft | windows_10_22h2 | < 10.0.19045.5247 | 10.0.19045.5247 |
| microsoft | windows_10_version_1507 | >= 10.0.10240.0 < 10.0.10240.20857 | 10.0.10240.20857 |
| microsoft | windows_10_version_1607 | >= 10.0.14393.0 < 10.0.14393.7606 | 10.0.14393.7606 |
| microsoft | windows_10_version_1809 | >= 10.0.17763.0 < 10.0.17763.6659 | 10.0.17763.6659 |
| microsoft | windows_10_version_21h2 | >= 10.0.19043.0 < 10.0.19044.5247 | 10.0.19044.5247 |
| microsoft | windows_10_version_22h2 | >= 10.0.19045.0 < 10.0.19045.5247 | 10.0.19045.5247 |
| microsoft | windows_11_22h2 | < 10.0.22621.4602 | 10.0.22621.4602 |
| microsoft | windows_11_23h2 | < 10.0.22631.4602 | 10.0.22631.4602 |
| microsoft | windows_11_24h2 | < 10.0.26100.2605 | 10.0.26100.2605 |
| microsoft | windows_11_version_22h2 | >= 10.0.22621.0 < 10.0.22621.4602 | 10.0.22621.4602 |
| microsoft | windows_11_version_22h3 | >= 10.0.22631.0 < 10.0.22631.4602 | 10.0.22631.4602 |
| microsoft | windows_11_version_23h2 | >= 10.0.22631.0 < 10.0.22631.4602 | 10.0.22631.4602 |
| microsoft | windows_11_version_24h2 | >= 10.0.26100.0 < 10.0.26100.2605 | 10.0.26100.2605 |
| microsoft | windows_server_2008 | — | — |
| microsoft | windows_server_2008 | — | — |
| microsoft | windows_server_2008_r2_service_pack_1 | >= 6.1.7601.0 < 6.1.7601.27467 | 6.1.7601.27467 |
| microsoft | windows_server_2008_service_pack_2 | >= 6.0.6003.0 < 6.0.6003.23016 | 6.0.6003.23016 |
| microsoft | windows_server_2012 | — | — |
| microsoft | windows_server_2012 | >= 6.2.9200.0 < 6.2.9200.25222 | 6.2.9200.25222 |
| microsoft | windows_server_2012_r2 | >= 6.3.9600.0 < 6.3.9600.22318 | 6.3.9600.22318 |
| microsoft | windows_server_2016 | < 10.0.14393.7606 | 10.0.14393.7606 |
Detection & IOCsextracted from sources · hover to see the quote
- →Monitor for creation of CLFS Base Log File (.blf) and container files under attacker-controlled directories (e.g., C:\temp\testlog\) by non-system processes, which is a pattern used in the CVE-2024-49138 proof-of-concept exploit. ↗
- →Detect calls to CreateLogFile and AddLogContainer Win32 APIs (Clfsw32.lib) from unexpected user-mode processes, as the exploit uses these to set up the CLFS heap-based buffer overflow trigger. ↗
- →Alert on NtQuerySystemInformation (SystemHandleInformation class 0x10) followed by NtReadVirtualMemory/NtWriteVirtualMemory against the kernel handle (-1) from the same process — a pattern used by the exploit to locate and overwrite kernel structures (KTHREAD.PreviousMode, token). ↗
- →The exploit targets KTHREAD.PreviousMode (offset 0x232) and TOKEN offset (0x4b8) in EPROCESS; monitor for unexpected privilege escalation to SYSTEM from authenticated low-privileged processes on Windows endpoints, consistent with ransomware pre-deployment activity. ↗
- →The vulnerability is a heap-based buffer overflow in the CLFS driver; monitor for kernel pool corruption events or unexpected SYSTEM-level child processes spawned from authenticated user sessions on unpatched Windows systems (patch deadline was 2024-12-31 per CISA KEV). ↗
- ·The exploit hardcodes kernel offsets (POFXPROCESSORNOTIFICATION, DBGKPTRIAGEDUMPRESTORESTATE, PSACTIVEPROCESSHEAD, ACTIVEPROCESSLINKS, UNIQUEPROCESSID, TOKEN, KTHREAD offsets) specific to Windows 11 23H2; these offsets will differ on other Windows versions, limiting direct reuse of the PoC across all affected platforms. ↗
CVSS provenance
nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vulncheck7.8HIGH
cisa7.8HIGH
vendor_msrc7.8HIGH
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CISA
Microsoft Windows Common Log File System (CLFS) Driver Heap-Based Buffer Overflow Vulnerability
cisa·2024-12-10·CVSS 7.8
CVE-2024-49138 [HIGH] CWE-122 Microsoft Windows Common Log File System (CLFS) Driver Heap-Based Buffer Overflow Vulnerability
Vulnerability: Microsoft Windows Common Log File System (CLFS) Driver Heap-Based Buffer Overflow Vulnerability
Affected: Microsoft Windows
Microsoft Windows Common Log File System (CLFS) driver contains a heap-based buffer overflow vulnerability that allows a local attacker to escalate privileges.
Required Action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Notes: https://msrc.microsoft.com/update-guide/en-US/vulnerability/CVE-2024-49138 ; https://nvd.nist.gov/vuln/detail/CVE-2024-49138
Remediation Due Date: 2024-12-31
Microsoft
Windows Common Log File System Driver Elevation of Privilege Vulnerability
vendor_msrc·2024-12-10·CVSS 7.8
CVE-2024-49138 [HIGH] CWE-122 Windows Common Log File System Driver Elevation of Privilege Vulnerability
Windows Common Log File System Driver Elevation of Privilege Vulnerability
FAQ: What privileges could be gained by an attacker who successfully exploited this vulnerability?
An attacker who successfully exploited this vulnerability could gain SYSTEM privileges.
Windows Common Log File System Driver: Windows Common Log File System Driver
Microsoft: Microsoft
Customer Action Required: Yes
Impact: Elevation of Privilege
Exploit Status: Publicly Disclosed:Yes;Exploited:Yes;Latest Software Release:Exploitation Detected;DOS:N/A
Reference: https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5048661
Reference: https://support.microsoft.com/help/5048661
Reference: https://catalog.update.microsoft.com/v7/site/Search.aspx?q=KB5048654
Reference: https://support.microsoft.com/help/50
GHSA
GHSA-h4hx-5g7m-p3hc: Windows Common Log File System Driver Elevation of Privilege Vulnerability
ghsa_unreviewed·2024-12-12
CVE-2024-49138 [HIGH] CWE-122 GHSA-h4hx-5g7m-p3hc: Windows Common Log File System Driver Elevation of Privilege Vulnerability
Windows Common Log File System Driver Elevation of Privilege Vulnerability
VulnCheck
Microsoft Windows Common Log File System (CLFS) Driver Heap-Based Buffer Overflow Vulnerability
vulncheck·2024·CVSS 7.8
CVE-2024-49138 [HIGH] CWE-122 Microsoft Windows Common Log File System (CLFS) Driver Heap-Based Buffer Overflow Vulnerability
Microsoft Windows Common Log File System (CLFS) Driver Heap-Based Buffer Overflow Vulnerability
Microsoft Windows Common Log File System (CLFS) driver contains a heap-based buffer overflow vulnerability that allows a local attacker to escalate privileges.
Affected: Microsoft Windows
Required Action: Apply mitigations per vendor instructions or discontinue use of the product if mitigations are unavailable.
Exploitation References: https://api.msrc.microsoft.com/cvrf/v3.0/cvrf/2024-Dec; https://docs.google.com/spreadsheets/d/1lkNJ0uQwbeC1ZTRrxdtuPLCIl7mlUreoKfSIgajnSyY/edit; https://msrc.microsoft.com/update-guide/en-US/advisory/CVE-2024-49138; https://www.cisa.gov/sites/default/files/feeds/known_exploited_vulnerabilities.json; https://security.humanativaspa.it/cve-2024-49138-windows-clf
No detection rules found.
Tenable
Microsoft’s May 2025 Patch Tuesday Addresses 71 CVEs (CVE-2025-32701, CVE-2025-32706, CVE-2025-30400)
blogs_tenable·2025-05-13·CVSS 7.8
[HIGH] Microsoft’s May 2025 Patch Tuesday Addresses 71 CVEs (CVE-2025-32701, CVE-2025-32706, CVE-2025-30400)
## Cloud Exposure
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## Business needs
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Tenable
Microsoft’s April 2025 Patch Tuesday Addresses 121 CVEs (CVE-2025-29824)
blogs_tenable·2025-04-08·CVSS 7.8
[HIGH] Microsoft’s April 2025 Patch Tuesday Addresses 121 CVEs (CVE-2025-29824)
## Cloud Exposure
Tenable Cloud Security (CNAPP) Request a demo
Tenable Cloud Vulnerability Management Request a demo
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## Vulnerability Exposure
Tenable Vulnerability Management Try for free
Tenable Security Center Request a demo
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## AI Exposure
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## Identity Exposure
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## Business needs
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Tenable
Cybersecurity Snapshot: CISA Calls for Stamping Out Buffer Overflow Vulnerabilities, as Europol Tells Banks To Prep For Quantum Threat
blogs_tenable·2025-02-14
Cybersecurity Snapshot: CISA Calls for Stamping Out Buffer Overflow Vulnerabilities, as Europol Tells Banks To Prep For Quantum Threat
## Cloud Exposure
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Tenable Cloud Vulnerability Management Request a demo
Tenable CIEM Request a demo
Secure your cloud
## Vulnerability Exposure
Tenable Vulnerability Management Try for free
Tenable Security Center Request a demo
Tenable Web App Scanning Try for free
Tenable Patch Management Request a demo
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Tenable Attack Surface Management Request a demo
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## AI Exposure
Tenable AI Exposure Request a demo
## OT/IoT Exposure
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## Identity Exposure
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## Business needs
Active Directory
AI Security Posture Management (AI-SPM)
AWS security
Azure security
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Checkpoint
16th December – Threat Intelligence Report
blogs_checkpoint·2024-12-16
CVE-2024-49138 16th December – Threat Intelligence Report
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## 16th December – Threat Intelligence Report
For the latest discoveries in cyber research for the week of 16th December, please download our Threat Intelligence Bulletin .
TOP ATTACKS AND BREACHES
The Romanian National Cybersecurity Directorate (DNSC) has disclosed a ransomware attack conducted by Lynx ransomware gang on the country’s energy provider Electrica Group, which provides services to more than 3.8M people across Muntenia and Transylvania. DNSC confirms that critical power supply systems were not impacte
Krebs
Patch Tuesday, December 2024 Edition
blogs_krebs·2024-12-11·CVSS 9.8
CVE-2024-49138 [CRITICAL] Patch Tuesday, December 2024 Edition
Microsoft today released updates to plug at least 70 security holes in Windows and Windows software, including one vulnerability that is already being exploited in active attacks.
The zero-day seeing exploitation involves CVE-2024-49138 , a security weakness in the Windows Common Log File System (CLFS) driver — used by applications to write transaction logs — that could let an authenticated attacker gain “system” level privileges on a vulnerable Windows device.
The security firm Rapid7 notes there have been a series of zero-day elevation of privilege flaws in CLFS over the past few years.
“Ransomware authors who have abused previous CLFS vulnerabilities will be only too pleased to get their hands on a fresh one,” wrote Adam Barnett , lead software engineer at Rapid7. “Expect more CLFS z
Krebs
Patch Tuesday, December 2024 Edition
blogs_krebs·2024-12-11·CVSS 9.8
CVE-2024-49138 [CRITICAL] Patch Tuesday, December 2024 Edition
Microsoft today released updates to plug at least 70 security holes in Windows and Windows software, including one vulnerability that is already being exploited in active attacks.
The zero-day seeing exploitation involves CVE-2024-49138, a security weakness in the Windows Common Log File System (CLFS) driver — used by applications to write transaction logs — that could let an authenticated attacker gain “system” level privileges on a vulnerable Windows device.
The security firm Rapid7 notes there have been a series of zero-day elevation of privilege flaws in CLFS over the past few years.
“Ransomware authors who have abused previous CLFS vulnerabilities will be only too pleased to get their hands on a fresh one,” wrote Adam Barnett, lead software engineer at Rapid7. “Expect more CLFS zer
Tenable
Microsoft’s December 2024 Patch Tuesday Addresses 70 CVEs (CVE-2024-49138)
blogs_tenable·2024-12-10·CVSS 7.8
[HIGH] Microsoft’s December 2024 Patch Tuesday Addresses 70 CVEs (CVE-2024-49138)
## Cloud Exposure
Tenable Cloud Security (CNAPP) Request a demo
Tenable Cloud Vulnerability Management Request a demo
Tenable CIEM Request a demo
Secure your cloud
## Vulnerability Exposure
Tenable Vulnerability Management Try for free
Tenable Security Center Request a demo
Tenable Web App Scanning Try for free
Tenable Patch Management Request a demo
Tenable Enclave Security Request a demo
Tenable Attack Surface Management Request a demo
Tenable Nessus Try for free
## AI Exposure
Tenable AI Exposure Request a demo
## OT/IoT Exposure
Tenable OT Security Request a demo
## Identity Exposure
Tenable Identity Exposure Request a demo
## Business needs
Active Directory
AI Security Posture Management (AI-SPM)
AWS security
Azure security
Cloud Security Posture Man
Talos
Microsoft Patch Tuesday for December 2024 contains four critical vulnerabilities
blogs_talos·2024-12-10·CVSS 8.4
CVE-2024-49112 [HIGH] Microsoft Patch Tuesday for December 2024 contains four critical vulnerabilities
The Patch Tuesday for December of 2024 includes 72 vulnerabilities, including four that Microsoft marked as “critical.” The remaining vulnerabilities listed are classified as “important.”
Microsoft assessed that exploitation of the four “critical” vulnerabilities is “less likely.”
CVE-2024-49112 is the most serious of this bunch, with a CVSS severity score of 9.8 out of 10. An attacker could exploit this vulnerability in Windows Lightweight Directory Access Protocol (LDAP) calls to execute arbitrary code within the context of the LDAP service. Additionally, CVE-2024-49124 and CVE-2024-49127 permit an unauthenticated attacker to send a specially crafted request to a vulnerable LDAP server, potentially executing the attacker's code if they succeed in a "race condition." Although the above
Qualys
Microsoft and Adobe Patch Tuesday, December 2024 Security Update Review
blogs_qualys·2024-12-10
Microsoft and Adobe Patch Tuesday, December 2024 Security Update Review
## Table of Contents
Microsoft Patch Tuesday for December 2024
Adobe Patches for December 2024
Zero-day Vulnerabilities Patched in December Patch Tuesday Edition
Critical Severity Vulnerabilities Patched in December Patch Tuesday Edition
Other Microsoft Vulnerability Highlights
Microsoft Release Summary
Discover and Prioritize Vulnerabilities in Vulnerability Management, Detection & Response (VMDR)
Rapid Response with Patch Management (PM)
EVALUATE Vendor-Suggested Mitigation with Policy Compliance (PC)
Qualys Monthly Webinar Series
Closing out 2024, Microsoft’s December Patch Tuesday highlights the importance of year-end maintenance with updates tackling critical vulnerabilities. As cyber threats remain persistent, these patches serve as a vital reminder of the ongoing need for
Talos
Microsoft Patch Tuesday for December 2024 contains four critical vulnerabilities
blogs_talos·2024-12-10·CVSS 8.4
CVE-2024-49112 [HIGH] Microsoft Patch Tuesday for December 2024 contains four critical vulnerabilities
## Microsoft Patch Tuesday for December 2024 contains four critical vulnerabilities
The Patch Tuesday for December of 2024 includes 72 vulnerabilities, including four that Microsoft marked as “critical.” The remaining vulnerabilities listed are classified as “important.”
Microsoft assessed that exploitation of the four “critical” vulnerabilities is “less likely.”
CVE-2024-49112 is the most serious of this bunch, with a CVSS severity score of 9.8 out of 10. An attacker could exploit this vulnerability in Windows Lightweight Directory Access Protocol (LDAP) calls to execute arbitrary code within the context of the LDAP service. Additionally, CVE-2024-49124 and CVE-2024-49127 permit an unauthenticated attacker to send a specially crafted request to a vulnerable LDAP server, potentially exe
Bleepingcomputer
Microsoft December 2024 Patch Tuesday fixes 1 exploited zero-day, 71 flaws
blogs_bleepingcomputer·2024-12-10·CVSS 7.8
[HIGH] Microsoft December 2024 Patch Tuesday fixes 1 exploited zero-day, 71 flaws
## Microsoft December 2024 Patch Tuesday fixes 1 exploited zero-day, 71 flaws
## Lawrence Abrams
27 Elevation of Privilege Vulnerabilities
30 Remote Code Execution Vulnerabilities
7 Information Disclosure Vulnerabilities
5 Denial of Service Vulnerabilities
1 Spoofing Vulnerabilities
This count does not include two Edge flaws that were previously fixed on December 5 and 6th.
To learn more about the non-security updates released today, you can review our dedicated articles on the Windows 11 KB5048667 & KB5048685 cumulative updates and the Windows 10 KB5048652 cumulative update .
## One actively exploited zero-day disclosed
This month's Patch Tuesday fixes one actively exploited, publicly disclosed zero-day vulnerability.
Microsoft classifies a zero-day flaw as one that is publicly
Qualys
Critical Microsoft Vulnerabilities Patched December 2024 | Qualys
blogs_qualys·2024-12-10
Critical Microsoft Vulnerabilities Patched December 2024 | Qualys
#### Table of Contents
- Microsoft Patch Tuesday for December 2024
- Adobe Patches for December 2024
- Zero-day Vulnerabilities Patched in December Patch Tuesday Edition
- Critical Severity Vulnerabilities Patched in December Patch Tuesday Edition
- Other Microsoft Vulnerability Highlights
- Microsoft Release Summary
- Discover and Prioritize Vulnerabilities in Vulnerability Management, Detection & Response (VMDR)
- Rapid Response with Patch Management (PM)
- EVALUATE Vendor-Suggested Mitigation with Policy Compliance (PC)
- Qualys Monthly Webinar Series
Closing out 2024, Microsoft’s December Patch Tuesday highlights the importance of year-end maintenance with updates tackling critical vulnerabilities. As cyber threats remain persistent, these patches serve as a vital reminder of the ong
Crowdstrike
December 2024 Patch Tuesday: Updates and Analysis
blogs_crowdstrike·CVSS 7.5
CVE-2026-20929 [HIGH] December 2024 Patch Tuesday: Updates and Analysis
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Zscaler
Zscaler protects against 3 new vulnerabilities | 12-10-2024
blogs_zscaler·CVSS 7.8
[HIGH] Zscaler protects against 3 new vulnerabilities | 12-10-2024
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2024-12-12
Published
2024-12-10
Added to CISA KEV
Exploited in the wild