CVE-2019-1483 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists when the Windows AppX Deployment Server improperly handles junctions.To exploit this vulnerability, an attacker would first have to gain execution on the victim system, aka 'Windows Elevation of Privilege Vulnerability'. This CVE ID is unique from CVE-2019-1476.
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Analysis
by VulDB Data Team • 03/09/2024
The vulnerability described in CVE-2019-1483 represents a critical elevation of privilege flaw within the Windows AppX Deployment Server component. This issue stems from improper handling of symbolic links or junctions within the Windows operating system's application deployment infrastructure. The vulnerability specifically affects how the system processes junction points during AppX package installation and deployment operations, creating a pathway for malicious actors to escalate their privileges beyond the initial access level they may have obtained.
The technical root cause of this vulnerability lies in the Windows AppX Deployment Server's inadequate validation of file system junctions when processing application packages. When the system encounters a junction point during deployment operations, it fails to properly verify the target location and permissions associated with the symbolic link. This improper handling allows an attacker who has already achieved initial execution on a target system to manipulate the deployment process and gain elevated privileges. The flaw exists in the Windows AppX deployment mechanism that is responsible for installing and managing modern Windows applications packaged in the AppX format.
The operational impact of this vulnerability is significant as it provides attackers with a means to bypass standard user permissions and escalate their access level to system administrator privileges. The exploitation requires an initial foothold on the victim system, which could be achieved through various attack vectors such as phishing emails, malicious software downloads, or other initial compromise techniques. Once the attacker has gained execution privileges, they can leverage this vulnerability to perform actions that would normally be restricted to privileged users, potentially enabling them to install malicious software, modify system files, access sensitive data, or establish persistent access to the compromised system. This elevation of privilege capability makes the vulnerability particularly dangerous in enterprise environments where privilege separation is a fundamental security control.
The vulnerability aligns with CWE-264, which addresses permissions, privileges, and access controls, specifically focusing on improper handling of symbolic links in the context of application deployment. From an ATT&CK framework perspective, this vulnerability maps to privilege escalation techniques, particularly T1068 which covers "Exploitation for Privilege Escalation" and T1547.001 which covers "Registry Run Keys / Startup Folder" as potential exploitation methods. Organizations should implement immediate mitigations including applying the relevant Microsoft security updates, monitoring for unusual AppX deployment activities, and restricting the ability of unprivileged users to create or modify junction points. Additionally, system administrators should review and tighten the permissions associated with AppX deployment components and implement network segmentation to limit lateral movement opportunities for attackers who might exploit this vulnerability. The remediation process should also include comprehensive security assessments of the Windows deployment infrastructure to identify and address any related configuration weaknesses that might compound the risk of exploitation.