CVE-2020-1122 in Windows
Summary
by MITRE
<p>An elevation of privilege vulnerability exists when the Windows Language Pack Installer improperly handles file operations. An attacker who successfully exploited this vulnerability could run processes in an elevated context.</p> <p>An attacker could exploit this vulnerability by running a specially crafted application on the victim system.</p> <p>The update addresses the vulnerability by correcting the way the Windows Language Pack Installer handles file operations.</p>
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Analysis
by VulDB Data Team • 02/24/2026
The CVE-2020-1122 vulnerability represents a critical elevation of privilege flaw within the Windows Language Pack Installer component, demonstrating a fundamental weakness in how the system handles file operations during language package installation processes. This vulnerability falls under the CWE-264 category of "Permissions, Privileges, and Access Controls" and specifically manifests as an improper handling of file operations that creates an exploitable condition for privilege escalation attacks. The flaw exists in the Windows operating system's language installation infrastructure, where the installer fails to properly validate or sanitize file operations that could be manipulated by malicious actors.
The technical exploitation of this vulnerability requires an attacker to execute a specially crafted application on a target system, leveraging the installer's failure to properly enforce access controls during file handling operations. This attack vector operates through the principle of privilege escalation where a standard user context can be elevated to system-level privileges through manipulation of the language pack installation process. The vulnerability's impact extends beyond simple privilege elevation as it potentially allows attackers to execute arbitrary code with elevated permissions, effectively providing a foothold for further compromise of the affected system. The attack surface is particularly concerning because language pack installation is a common administrative task that may be performed by users with lower privileges.
From an operational perspective, this vulnerability creates significant risk for enterprise environments where language packs are frequently installed or updated. The exploitability of this flaw means that any user with the ability to run applications on a targeted system could potentially leverage this vulnerability to gain elevated privileges, making it particularly dangerous in multi-user environments or shared computing scenarios. The vulnerability's presence in the Windows Language Pack Installer component means that attacks could occur during routine system maintenance or user-initiated language configuration changes, making detection and prevention more challenging. Organizations that have not applied the security update may find their systems vulnerable to exploitation that could lead to complete system compromise and potential lateral movement within network environments.
The remediation for CVE-2020-1122 involves applying the official Microsoft security update that corrects the file operation handling within the Windows Language Pack Installer. This patch addresses the root cause by implementing proper validation and access control mechanisms during file operations, ensuring that the installer properly enforces privilege boundaries. Organizations should prioritize deployment of this update across all affected Windows systems, particularly those running vulnerable versions of Windows 10, Windows Server 2016, and Windows Server 2019. The fix aligns with the ATT&CK technique T1068 for "Exploitation for Privilege Escalation" and demonstrates the importance of proper input validation and privilege enforcement in system components that handle user-supplied data or operations. Security teams should monitor for any exploitation attempts targeting this vulnerability through network intrusion detection systems and endpoint protection platforms, as the attack pattern may be used as part of broader exploitation campaigns targeting Windows environments.