CVE-2022-23187: Adobe Illustrator Buffer Overflow Flaw

CVE-2022-23187 Overview

Adobe Illustrator version 26.0.3 (and earlier) is affected by a buffer overflow vulnerability due to insecure handling of a crafted file, potentially resulting in arbitrary code execution in the context of the current user. This vulnerability falls under CWE-120 (Buffer Copy without Checking Size of Input), which represents a classic buffer overflow where data is copied to a buffer without properly verifying that the destination buffer is large enough to hold the data.

Exploitation requires user interaction in that a victim must open a crafted file in Illustrator. An attacker could leverage this vulnerability to execute malicious code with the privileges of the logged-in user, potentially leading to full system compromise depending on the user's access level.

Critical Impact

Successful exploitation allows arbitrary code execution in the context of the current user, potentially enabling attackers to install malware, steal sensitive design files, or pivot to other systems on the network.

Affected Products

• Adobe Illustrator version 26.0.3 and earlier on Windows
• Adobe Illustrator version 26.0.3 and earlier on macOS
• Apple macOS (as a platform hosting vulnerable Illustrator installations)
• Microsoft Windows (as a platform hosting vulnerable Illustrator installations)

Discovery Timeline

• 2022-03-11 - CVE-2022-23187 published to NVD
• 2024-11-21 - Last updated in NVD database

Technical Details for CVE-2022-23187

Vulnerability Analysis

This buffer overflow vulnerability stems from insecure handling of crafted files within Adobe Illustrator. The flaw occurs when the application processes specially crafted input files, failing to properly validate the size of data before copying it into a fixed-size buffer. When a user opens a maliciously crafted file, the application may copy more data than the allocated buffer can hold, leading to memory corruption.

The local attack vector requires an attacker to deliver a malicious file to the victim through social engineering methods such as email attachments, file sharing services, or malicious downloads. Once the victim opens the crafted file in Illustrator, the buffer overflow is triggered, potentially allowing the attacker to overwrite adjacent memory regions including return addresses or function pointers.

Root Cause

The vulnerability originates from a classic buffer overflow condition (CWE-120) where Illustrator's file parsing routines fail to check the size of input data before copying it into a fixed-size memory buffer. This absence of proper boundary checking allows an attacker to craft a malicious file that, when parsed, causes data to overflow beyond the allocated buffer space. The root cause is inadequate input validation in the file handling code path, which does not properly sanitize or limit the size of data being processed from untrusted file sources.

Attack Vector

The attack requires local access and user interaction. An attacker must craft a malicious Illustrator file (such as .ai, .eps, or related formats) containing specially formatted data designed to trigger the buffer overflow. The attack scenario typically involves:

1. The attacker creates a malicious file exploiting the buffer overflow vulnerability
2. The file is delivered to the victim via email attachment, compromised website, or file sharing
3. The victim opens the file in Adobe Illustrator
4. Upon parsing the malicious file, the buffer overflow occurs
5. Arbitrary code execution is achieved in the context of the current user

The vulnerability does not require elevated privileges, but code execution occurs with whatever permissions the current user possesses. If the user has administrative rights, the impact is significantly more severe.

Detection Methods for CVE-2022-23187

Indicators of Compromise

• Unexpected crashes or abnormal behavior in Adobe Illustrator when opening files from untrusted sources
• Suspicious child processes spawned by the Illustrator application (Illustrator.exe on Windows or Adobe Illustrator on macOS)
• Unusual network connections initiated by Illustrator following file operations
• Unexpected file modifications or new executable files created in user-writable directories after opening Illustrator files

Detection Strategies

• Monitor process creation events for suspicious child processes spawned by Adobe Illustrator
• Implement file integrity monitoring on systems where Illustrator is installed to detect post-exploitation activity
• Use endpoint detection and response (EDR) solutions to identify anomalous behavior patterns following Illustrator file operations
• Deploy email gateway scanning to detect and quarantine suspicious Illustrator file attachments

Monitoring Recommendations

• Enable verbose logging for Adobe Creative Cloud applications to capture file access patterns
• Configure SIEM rules to alert on unusual process trees originating from Adobe Illustrator
• Monitor for memory-related exceptions and crash reports from Illustrator that may indicate exploitation attempts
• Track outbound network connections from creative applications that deviate from normal Adobe service communications

How to Mitigate CVE-2022-23187

Immediate Actions Required

• Update Adobe Illustrator to the latest version immediately through Adobe Creative Cloud
• Educate users about the risks of opening Illustrator files from untrusted or unknown sources
• Implement application allowlisting to restrict execution of unauthorized programs
• Consider temporarily disabling or restricting Illustrator access for non-essential users until patching is complete

Patch Information

Adobe has released a security update to address this vulnerability as documented in Adobe Security Advisory APSB22-15. Organizations should apply the latest Illustrator updates through Adobe Creative Cloud or enterprise deployment tools. The patch addresses the buffer overflow by implementing proper bounds checking when processing file data.

To verify your installation is patched:

1. Open Adobe Illustrator
2. Navigate to Help > About Illustrator
3. Verify the version is newer than 26.0.3

Workarounds

• Implement network segmentation to isolate systems running vulnerable Illustrator versions
• Configure email security gateways to block or sandbox Illustrator file attachments from external sources
• Use virtual environments or sandboxed applications when opening Illustrator files from untrusted sources
• Apply the principle of least privilege to limit user account permissions, reducing the impact of potential exploitation

# Configuration example - Verify Adobe Illustrator version on macOS
mdls -name kMDItemVersion "/Applications/Adobe Illustrator 2022/Adobe Illustrator.app"

# Configuration example - Check for Adobe Illustrator updates via command line on Windows
# Navigate to Creative Cloud directory and check for updates
cd "%ProgramFiles%\Adobe\Adobe Creative Cloud\Utils"
.\Creative Cloud Uninstaller.exe --list-installed-apps