CVE-2009-2188 in Mac OS X
Summary
by MITRE
Buffer overflow in ImageIO in Apple Mac OS X 10.5 before 10.5.8, and Safari before 4.0.3, allows remote attackers to execute arbitrary code or cause a denial of service (application crash) via an image with crafted EXIF metadata.
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Analysis
by VulDB Data Team • 05/11/2025
The vulnerability identified as CVE-2009-2188 represents a critical buffer overflow flaw within Apple's ImageIO framework that affected Mac OS X versions 10.5 through 10.5.7 and Safari browser versions prior to 4.0.3. This vulnerability specifically targets the processing of EXIF metadata within image files, creating a pathway for remote attackers to exploit the system through maliciously crafted image content. The flaw resides in how the ImageIO framework handles metadata parsing, particularly when encountering malformed EXIF data that exceeds allocated buffer boundaries. This type of vulnerability falls under the CWE-121 buffer overflow category, which is classified as a critical weakness in software design that allows attackers to overwrite adjacent memory locations. The vulnerability demonstrates characteristics consistent with CWE-787 out-of-bounds write, where the application writes data beyond the bounds of a fixed-length buffer, potentially leading to arbitrary code execution or system instability.
The technical exploitation of this vulnerability occurs when a user views an image file containing crafted EXIF metadata through Safari or other applications that utilize the ImageIO framework. When the system attempts to parse the malformed metadata, the buffer overflow condition is triggered, causing the application to crash or potentially allowing an attacker to inject and execute malicious code. The attack vector is particularly dangerous because it requires no user interaction beyond viewing the image, making it a passive attack that can be delivered through web pages, email attachments, or file sharing systems. The vulnerability's impact extends across multiple attack surfaces including web browsers, image viewers, and any application that processes EXIF metadata, making it a significant concern for enterprise environments where users may encounter malicious images through various channels. This aligns with ATT&CK technique T1203, where adversaries leverage software vulnerabilities to gain execution privileges through malicious payloads embedded in image files.
The operational impact of CVE-2009-2188 was substantial as it allowed for remote code execution capabilities that could compromise entire user sessions and potentially lead to full system compromise. When exploited, the vulnerability could cause denial of service conditions through application crashes, but more critically, it enabled attackers to execute arbitrary code with the privileges of the affected application. This meant that if a user viewed an infected image in Safari, the attacker could potentially gain control over the browser process and subsequently the user's system. The vulnerability was particularly concerning because it affected widely used applications and operating systems, making it a prime target for malware authors and nation-state actors. Organizations using affected versions of Mac OS X and Safari were at significant risk, as the exploitation could occur without any user awareness or interaction beyond viewing the malicious content. The vulnerability's persistence across multiple versions of the operating system and browser highlighted the need for comprehensive patch management strategies and demonstrated how metadata processing flaws could create persistent security risks in multimedia frameworks.
Mitigation strategies for CVE-2009-2188 focused primarily on applying official security patches released by Apple, which addressed the buffer overflow by implementing proper bounds checking and input validation for EXIF metadata processing. System administrators should have immediately deployed updates to Mac OS X 10.5.8 and ensured Safari was updated to version 4.0.3 or later. Additional protective measures included implementing web content filtering to block suspicious image files, disabling automatic image preview in email clients, and educating users about the risks of viewing images from untrusted sources. Network-level defenses such as intrusion detection systems could have been configured to monitor for patterns associated with EXIF metadata exploitation attempts. The vulnerability highlighted the importance of secure coding practices, particularly around buffer management and input validation, and reinforced the need for regular security assessments of multimedia processing libraries. Organizations should have implemented robust patch management policies to ensure timely deployment of security updates, as this vulnerability demonstrated how seemingly benign image processing could become a critical security risk. The incident also emphasized the value of the principle of least privilege, where applications should be restricted from performing unnecessary image processing operations that could expose them to such vulnerabilities.