CVE-2020-0648 in Windows
Summary
by MITRE
<p>An elevation of privilege vulnerability exists when the Windows RSoP Service Application improperly handles memory.</p> <p>To exploit this vulnerability, an attacker would first have to gain execution on the victim system. An attacker could then run a specially crafted application to elevate privileges.</p> <p>The security update addresses the vulnerability by correcting how the Windows RSoP Service Application handles memory.</p>
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Analysis
by VulDB Data Team • 02/23/2026
The vulnerability identified as CVE-2020-0648 represents a critical elevation of privilege flaw within the Windows Remote Server Operating System Policy (RSoP) service application. This vulnerability stems from improper memory handling mechanisms within the RSoP service that operates as part of Windows Group Policy processing. The RSoP service is responsible for collecting and storing Group Policy information for remote systems, making it a critical component in enterprise network management and policy enforcement. The flaw manifests when the service processes memory allocations and deallocations in a manner that can be manipulated by malicious code, potentially allowing unauthorized privilege escalation.
The exploitation vector for this vulnerability requires an initial foothold on the target system, as attackers must first achieve execution privileges before leveraging the memory handling flaw. This prerequisite aligns with common attack methodologies where adversaries typically gain initial access through phishing, drive-by downloads, or other initial compromise techniques before attempting privilege escalation. Once an attacker has executed malicious code on the victim system, the vulnerability can be exploited by crafting a specially designed application that takes advantage of the improper memory handling within the RSoP service. This process typically involves manipulating memory structures to overwrite critical system components or execute arbitrary code with elevated privileges.
From a technical perspective, the vulnerability falls under the CWE-121 category of "Stack-based Buffer Overflow" and potentially relates to CWE-122 "Heap-based Buffer Overflow" depending on the specific memory manipulation techniques employed. The operational impact of this vulnerability is significant as it allows attackers to escalate from standard user privileges to SYSTEM level access, providing complete control over the affected system. This privilege escalation capability enables attackers to bypass security controls, access sensitive data, install malicious software, and potentially establish persistent access within the network. The RSoP service's role in Group Policy processing means that successful exploitation could affect multiple systems within an enterprise environment, particularly those that rely heavily on centralized policy management.
The security update for CVE-2020-0648 addresses the core memory handling issue by implementing proper memory allocation and deallocation procedures within the RSoP service application. Microsoft's fix involves correcting the memory management routines to prevent buffer overflows and improper memory access patterns that could be exploited by malicious code. This remediation follows established best practices for memory safety as outlined in the ATT&CK framework under the Privilege Escalation technique, specifically targeting the use of service applications with improper memory handling. Organizations should prioritize applying this update as it directly addresses a critical security gap in Windows Group Policy processing that could be leveraged by sophisticated attackers. The vulnerability demonstrates the importance of proper memory management in system services and highlights the need for regular security updates, particularly for services that operate with elevated privileges and handle sensitive system information.