CVE-2020-0708: Windows 10 Imaging Library RCE Flaw

CVE-2020-0708 Overview

A remote code execution vulnerability exists in the Windows Imaging Library due to improper memory handling. This vulnerability allows an attacker to execute arbitrary code in the context of the current user by coercing a victim to open a specially crafted file. The attack relies on user interaction—specifically opening a malicious image file—which then triggers memory corruption within the Windows Imaging Library component.

Critical Impact

Successful exploitation allows attackers to execute arbitrary code with the privileges of the current user, potentially leading to full system compromise on affected Windows systems.

Affected Products

• Microsoft Windows 10 (all versions through 1909)
• Microsoft Windows 7 SP1
• Microsoft Windows 8.1
• Microsoft Windows RT 8.1
• Microsoft Windows Server 2008 SP2 and R2 SP1
• Microsoft Windows Server 2012 and R2
• Microsoft Windows Server 2016 (including versions 1803, 1903, 1909)
• Microsoft Windows Server 2019

Discovery Timeline

• 2020-02-11 - CVE-2020-0708 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2020-0708

Vulnerability Analysis

The Windows Imaging Library Remote Code Execution vulnerability stems from how the Windows Imaging Library processes image data in memory. When the library parses a specially crafted image file, it fails to properly validate or handle certain memory operations, leading to memory corruption conditions that can be exploited for arbitrary code execution.

The vulnerability requires user interaction to exploit—a target must be convinced to open a malicious image file. This could occur through phishing emails containing malicious attachments, compromised websites hosting malicious images, or social engineering tactics that trick users into downloading and opening attacker-controlled files.

If successfully exploited, an attacker would gain code execution with the same privilege level as the logged-in user. In environments where users operate with administrative privileges, this could result in complete system compromise, including the ability to install programs, modify data, or create new accounts with full user rights.

Root Cause

The root cause of this vulnerability is improper memory handling within the Windows Imaging Library. The library fails to correctly manage memory operations when processing image data, creating a condition where specially crafted input can corrupt memory structures. This memory corruption can then be leveraged by an attacker to redirect program execution flow and execute arbitrary code.

Attack Vector

The attack vector requires local access through user interaction. An attacker must craft a malicious image file specifically designed to trigger the memory handling flaw in the Windows Imaging Library. The attack chain typically follows this pattern:

1. The attacker creates a specially crafted image file containing exploit payload
2. The malicious file is delivered to the victim via email attachment, web download, or file share
3. The victim opens or previews the malicious image file
4. The Windows Imaging Library processes the file, triggering the memory corruption
5. Attacker-controlled code executes with the victim's privileges

The vulnerability can be triggered through various Windows components that utilize the Windows Imaging Library for image processing, including built-in image viewers, preview handlers, and applications that render image thumbnails.

Detection Methods for CVE-2020-0708

Indicators of Compromise

• Unusual crashes or errors in Windows Imaging Library components or processes that handle image rendering
• Unexpected child processes spawned from image viewer applications or Explorer preview handlers
• Anomalous memory allocation patterns in processes handling image files
• Suspicious image files with malformed headers or unusual internal structures

Detection Strategies

• Deploy endpoint detection and response (EDR) solutions like SentinelOne to monitor for exploitation attempts targeting Windows Imaging Library
• Monitor for abnormal behavior in processes that handle image file rendering, particularly unexpected code execution or memory access patterns
• Implement file integrity monitoring to detect attempts to introduce malicious image files into the environment
• Configure application control policies to restrict execution of unsigned code from image processing contexts

Monitoring Recommendations

• Enable Windows Event logging for application crashes and errors related to imaging components
• Monitor network traffic for delivery of potentially malicious image files via email or web downloads
• Utilize behavioral analytics to detect post-exploitation activity following successful code execution
• Implement SentinelOne's behavioral AI engine to detect and block exploitation attempts in real-time

How to Mitigate CVE-2020-0708

Immediate Actions Required

• Apply the security update from Microsoft immediately to all affected Windows systems
• Restrict users from opening image files from untrusted sources until patches are applied
• Implement email filtering to scan and quarantine suspicious image attachments
• Enable attack surface reduction rules in Windows Defender to limit exploitation vectors

Patch Information

Microsoft has released a security update that addresses this vulnerability by correcting how the Windows Imaging Library handles memory. The patch was released as part of Microsoft's February 2020 security updates. Organizations should obtain the appropriate patches from the Microsoft Security Advisory for CVE-2020-0708.

Apply the relevant KB updates for your Windows version through Windows Update, Windows Server Update Services (WSUS), or manual download from the Microsoft Update Catalog.

Workarounds

• Implement strict email filtering policies to block image file attachments from external sources
• Configure Windows Defender Application Guard to isolate potentially malicious content
• Disable preview pane functionality in Windows Explorer to prevent automatic image processing
• Train users to avoid opening image files from unknown or untrusted sources until systems are patched

# Disable Windows Explorer preview pane via registry (temporary workaround)
reg add "HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer" /v NoReadingPane /t REG_DWORD /d 1 /f