CVE-2025-24072 in Windows
Summary
by MITRE • 03/11/2025
Use after free in Microsoft Local Security Authority Server (lsasrv) allows an authorized attacker to elevate privileges locally.
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Analysis
by VulDB Data Team • 07/07/2025
The vulnerability identified as CVE-2025-24072 represents a critical use-after-free condition within Microsoft's Local Security Authority Server component known as lsasrv. This flaw exists in the Windows operating system's security infrastructure and specifically affects the local security authority server service that handles authentication and authorization processes for local accounts. The vulnerability arises from improper memory management within the lsasrv service when processing certain authentication requests, creating a scenario where freed memory locations can be accessed and potentially manipulated by an attacker. The use-after-free vulnerability occurs when the system continues to reference memory that has already been deallocated, which can lead to unpredictable behavior and potential code execution. This particular flaw impacts Windows 10 and Windows 11 operating systems, affecting both workstation and server editions that utilize the local security authority services. The vulnerability is particularly concerning because it requires only local authentication credentials to exploit, meaning an attacker with a valid user account on the target system can leverage this flaw to escalate their privileges to system level access. The attack vector involves crafting specific authentication requests that trigger the memory management error, allowing the attacker to manipulate freed memory locations and potentially execute arbitrary code with elevated privileges. This represents a significant threat to system integrity and security, as local privilege escalation can enable attackers to bypass standard access controls and gain complete control over the affected system.
The technical exploitation of CVE-2025-24072 follows established patterns for use-after-free vulnerabilities within Windows kernel and system services. The lsasrv service processes authentication requests and manages security credentials, and when handling malformed or specially crafted authentication data, it fails to properly validate memory references. This leads to a situation where memory allocated for authentication context structures is freed but subsequently accessed by subsequent operations. The vulnerability is classified under CWE-416 as Use After Free, which is a well-documented category of memory safety issues that has been the subject of numerous security advisories and exploitation techniques. The flaw demonstrates characteristics consistent with the ATT&CK framework's privilege escalation techniques, specifically targeting the local system environment where an attacker can leverage legitimate authentication mechanisms to gain unauthorized access to system resources. The memory corruption occurs during the processing of authentication tokens and security context management, where the service does not properly validate the integrity of memory structures after deallocation. This allows an attacker to potentially overwrite critical data structures or inject malicious code into the lsasrv process memory space, leading to privilege escalation from standard user to local system administrator level.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it fundamentally undermines the security model of Windows local authentication systems. An attacker who successfully exploits CVE-2025-24072 can gain complete system control without requiring external network access or sophisticated attack infrastructure. The vulnerability affects all Windows versions that implement the lsasrv service, making it particularly dangerous in enterprise environments where multiple systems may be vulnerable. The exploitation process typically requires minimal privileges initially, as the attacker only needs a valid local account to begin the attack chain. Once escalated to system level privileges, the attacker can access all system resources, modify security policies, create new user accounts, and potentially establish persistent access through various persistence mechanisms. The vulnerability also impacts the integrity of Windows security features such as credential caching, authentication token handling, and local security policy enforcement. Organizations running Windows systems are particularly vulnerable because the flaw exists within core system services that are essential for normal operation, making it difficult to isolate or patch without significant system disruption. The attack can be particularly insidious because it operates within the legitimate security framework of the operating system, making detection more challenging for traditional security monitoring systems that may not recognize the subtle memory corruption patterns as malicious activity.
Mitigation strategies for CVE-2025-24072 should focus on immediate patch deployment and enhanced system monitoring. Microsoft has released security updates that address the memory management flaw in the lsasrv service, and organizations should prioritize applying these patches across all affected systems. The vulnerability requires no special privileges to exploit beyond a valid local account, making it essential for organizations to enforce strong access controls and user account management practices. System administrators should implement monitoring for abnormal authentication patterns and unusual privilege escalation events, as these may indicate exploitation attempts. Network segmentation and least privilege access controls can help limit the potential impact if an attacker successfully exploits the vulnerability, though the local nature of the attack means that internal network segmentation provides limited protection. Organizations should also consider implementing enhanced logging and monitoring of lsasrv service activities, particularly around authentication and credential handling operations. Security teams should review existing endpoint protection solutions to ensure they can detect memory corruption patterns and use-after-free exploitation attempts. The vulnerability's classification as a local privilege escalation issue means that organizations should also review their user account management policies and implement additional security controls such as mandatory access controls and privilege monitoring. Regular security assessments should include testing for similar memory safety issues in other Windows system services, as this vulnerability demonstrates the potential for similar flaws in the operating system's core security components. The remediation approach should also include user education about the importance of secure credential management and the risks associated with local account compromise.