CVE-2018-8339 in Windows
Summary
by MITRE
An elevation of privilege vulnerability exists in the Windows Installer when the Windows Installer fails to properly sanitize input leading to an insecure library loading behavior, aka "Windows Installer Elevation of Privilege Vulnerability." This affects Windows 7, Windows Server 2012 R2, Windows RT 8.1, Windows Server 2008, Windows Server 2012, Windows 8.1, Windows Server 2016, Windows Server 2008 R2, Windows 10, Windows 10 Servers.
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Analysis
by VulDB Data Team • 05/01/2023
The vulnerability described in CVE-2018-8339 represents a critical elevation of privilege flaw within the Windows Installer component that has far-reaching implications for system security across multiple Windows operating systems. This weakness stems from inadequate input sanitization mechanisms within the installer service, creating conditions where malicious actors can exploit insecure library loading behaviors to gain unauthorized administrative privileges. The vulnerability affects a broad range of Windows platforms including legacy systems like Windows Server 2008 and Windows Server 2008 R2, as well as newer versions such as Windows 10 and Windows Server 2016, demonstrating the persistence of this architectural flaw across different system generations.
The technical root cause of this vulnerability lies in the Windows Installer's improper handling of input parameters during the installation process, specifically when loading dynamic link libraries. When a malicious user provides specially crafted input to an installer, the system fails to properly validate or sanitize these parameters before using them to load external libraries. This insecure library loading behavior creates opportunities for attackers to manipulate the installation process and load malicious code in place of legitimate system components. The flaw operates under CWE-22, which classifies improper limitation of a pathname to a restricted directory, and CWE-427, which addresses uncontrolled search path element, both of which are fundamental security weaknesses in software design that enable privilege escalation attacks.
From an operational perspective, this vulnerability enables attackers to execute arbitrary code with SYSTEM privileges, effectively bypassing standard user access controls and gaining complete control over affected systems. The exploitation typically requires local user access but can be leveraged to establish persistent backdoors, escalate privileges, and move laterally within network environments. The impact extends beyond individual system compromise as attackers can use this vulnerability to establish footholds in enterprise networks, potentially leading to widespread data breaches and system infiltration. The vulnerability's presence in both client and server operating systems makes it particularly dangerous as it can be exploited in various network scenarios from single workstation compromises to large-scale enterprise attacks.
Security professionals should implement multiple layers of defense to protect against exploitation of this vulnerability, including immediate deployment of Microsoft security patches, implementation of application whitelisting policies, and enhanced monitoring of installer activities. The ATT&CK framework categorizes this vulnerability under privilege escalation techniques, specifically targeting the "Exploitation for Privilege Escalation" tactic where adversaries leverage software vulnerabilities to gain elevated system privileges. Organizations should also consider implementing least privilege principles, disabling unnecessary installation services, and conducting regular security assessments to identify potential exploitation vectors. Given the broad scope of affected systems, comprehensive vulnerability management programs must prioritize this issue alongside other critical security flaws to maintain robust defensive postures against sophisticated attack campaigns that may target these specific Windows Installer weaknesses.