CVE-2020-1463 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists in the way that the SharedStream Library handles objects in memory, aka 'Windows SharedStream Library Elevation of Privilege Vulnerability'.
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Analysis
by VulDB Data Team • 10/29/2020
The Windows SharedStream Library elevation of privilege vulnerability represents a critical security flaw that allows attackers to escalate their privileges within Windows operating systems. This vulnerability specifically affects the shared memory handling mechanisms used by the Windows operating system, particularly in how it manages objects in memory through the SharedStream Library component. The flaw enables malicious actors to gain unauthorized access to elevated system privileges, potentially allowing them to execute arbitrary code with system-level permissions. The vulnerability stems from improper validation and handling of shared memory objects, creating opportunities for privilege escalation attacks that could compromise entire systems.
The technical implementation of this vulnerability involves the SharedStream Library's inadequate memory management practices when processing shared objects between different processes or security contexts. Attackers can exploit this weakness by crafting malicious shared memory objects that manipulate the library's internal state during object handling operations. The flaw typically manifests when the library fails to properly validate memory access permissions or when it incorrectly processes shared memory segments that should be restricted to specific security contexts. This improper handling allows attackers to bypass normal security boundaries and elevate their privileges from standard user level to system administrator level, effectively granting them complete control over the affected system. The vulnerability aligns with CWE-264, which addresses permissions, privileges, and access controls, specifically focusing on improper access control mechanisms within system libraries.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with a powerful foothold for further system compromise. Once successfully exploited, the vulnerability enables attackers to perform actions such as installing malicious software, modifying system files, accessing sensitive data, and potentially establishing persistent backdoors within the compromised system. The attack vector typically involves leveraging the shared memory handling capabilities to manipulate system objects that should remain protected from unauthorized access. Organizations running affected versions of Windows are particularly vulnerable to attacks that could result in complete system compromise, making this vulnerability a significant concern for enterprise security. The threat landscape for this vulnerability includes advanced persistent threat groups and sophisticated malware authors who seek to exploit such fundamental system weaknesses to gain long-term access to target environments.
Mitigation strategies for this vulnerability involve implementing timely security updates from Microsoft, which address the underlying memory handling issues within the SharedStream Library. System administrators should prioritize patch deployment across all affected Windows systems, particularly those running older versions of the operating system where this vulnerability is more prevalent. Additional protective measures include implementing strict process isolation, monitoring for unusual shared memory access patterns, and configuring appropriate access controls to limit the potential impact of exploitation attempts. Network segmentation and privilege minimization practices can help reduce the attack surface and limit the damage that could result from successful exploitation. Organizations should also consider implementing behavioral monitoring solutions that can detect anomalous shared memory usage patterns that might indicate exploitation attempts. The vulnerability demonstrates the importance of secure memory management practices in system libraries and highlights the critical need for robust access control mechanisms in operating system components. According to ATT&CK framework, this vulnerability maps to privilege escalation techniques and specifically targets the T1068 privilege escalation tactic, making it a significant concern for defenders implementing comprehensive security controls.