CVE-2012-0277 in XnView
Summary
by MITRE
Heap-based buffer overflow in XnView before 1.99 allows remote attackers to cause a denial of service (application crash) and possibly execute arbitrary code via a crafted PCT image.
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Analysis
by VulDB Data Team • 08/04/2025
The vulnerability identified as CVE-2012-0277 represents a critical heap-based buffer overflow flaw discovered in XnView software versions prior to 199. This vulnerability resides within the image handling functionality of the application, specifically when processing PCT image format files. The issue stems from inadequate input validation and memory management practices during the parsing of maliciously crafted image data, creating a condition where attacker-controlled data can overwrite adjacent memory locations in the application's heap memory space. Such buffer overflow conditions are particularly dangerous because they can lead to unpredictable application behavior and potentially enable remote code execution.
The technical implementation of this vulnerability involves the manipulation of PCT image files to trigger memory corruption during the image parsing process. When XnView attempts to load a specially crafted PCT file, the application fails to properly validate the size parameters within the image header structure, leading to a situation where more data is written to a heap-allocated buffer than it can accommodate. This heap overflow condition typically occurs when the application calculates buffer sizes based on malformed input data without sufficient bounds checking. The flaw falls under the CWE-121 heap-based buffer overflow category, which is classified as a serious weakness in memory safety and represents a common vector for exploitation in image processing applications. The vulnerability is particularly concerning because it can be triggered remotely through web-based attacks, making it accessible to attackers without requiring local system access.
The operational impact of CVE-2012-0277 extends beyond simple denial of service conditions to potentially enable remote code execution. When exploited successfully, the buffer overflow can cause application crashes or allow attackers to inject and execute arbitrary code within the context of the vulnerable application. This represents a significant threat to system security as it can lead to complete system compromise, especially when XnView is used in server environments or by users with elevated privileges. The vulnerability's remote exploitability means that attackers can deliver malicious PCT files through various attack vectors including email attachments, web downloads, or compromised websites. The attack surface is particularly broad given that XnView is a widely used image viewer application across multiple operating systems, making the potential impact of exploitation substantial.
Mitigation strategies for CVE-2012-0277 should prioritize immediate software updates to version 1.99 or later, which contains the necessary patches to address the heap overflow vulnerability. Organizations should implement comprehensive patch management procedures to ensure all affected systems receive the security updates promptly. Additional protective measures include deploying application whitelisting solutions to restrict execution of untrusted image files, implementing network-based intrusion detection systems to monitor for exploitation attempts, and configuring web browsers with restricted file type handling to prevent automatic execution of potentially malicious image files. Security professionals should also consider implementing sandboxing mechanisms for image processing applications to contain potential exploitation attempts. The vulnerability demonstrates the importance of proper input validation and memory management practices in software development, aligning with ATT&CK techniques related to buffer overflow exploitation and privilege escalation. Organizations should also conduct regular security assessments of image processing applications to identify similar vulnerabilities that may exist in other software components.