CVE-2018-11531 in Exiv2
Summary
by MITRE
Exiv2 0.26 has a heap-based buffer overflow in getData in preview.cpp.
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Analysis
by VulDB Data Team • 03/17/2023
The vulnerability CVE-2018-11531 represents a critical heap-based buffer overflow within the Exiv2 library version 0.26, specifically occurring in the getData function located in preview.cpp. This flaw exists within a widely-used image metadata processing library that handles various image formats including jpeg tiff and raw image files. The buffer overflow vulnerability arises when the library processes preview data within image files, particularly when handling malformed or maliciously crafted image metadata structures that exceed expected buffer boundaries. The vulnerability is classified as a heap overflow under CWE-121 which specifically addresses buffer overflow conditions in heap-based memory allocations. This type of vulnerability falls under the ATT&CK technique T1203 - Exploitation for Client Execution, as it can be exploited through manipulation of image files processed by applications using Exiv2.
The technical exploitation of this vulnerability occurs when an application utilizing Exiv2 attempts to extract preview data from an image file containing malformed metadata. The getData function in preview.cpp fails to properly validate input data lengths before performing memory operations, allowing an attacker to craft image files that trigger buffer overflows during preview data extraction. This heap-based overflow can lead to memory corruption that may result in arbitrary code execution or application crashes. The vulnerability is particularly concerning because Exiv2 is integrated into numerous applications including image viewers editors and content management systems that process user-uploaded images. The flaw demonstrates poor input validation practices and inadequate bounds checking in memory allocation operations.
The operational impact of CVE-2018-11531 extends beyond simple application instability to potential security breaches in environments where Exiv2 is used for processing untrusted image data. Attackers can exploit this vulnerability by uploading specially crafted image files that contain malicious preview data structures designed to trigger the buffer overflow during normal processing operations. When exploited successfully, the vulnerability could allow remote code execution on systems running applications that use Exiv2, particularly affecting web applications that process user-uploaded images without proper sanitization. This vulnerability affects a broad range of systems including desktop applications web servers and mobile applications that rely on Exiv2 for image metadata handling. The impact is amplified by the library's widespread adoption across different software platforms and operating systems.
Mitigation strategies for CVE-2018-11531 should focus on immediate patching of Exiv2 library versions to 0.27 or later where the buffer overflow has been resolved through proper input validation and bounds checking. Organizations should implement comprehensive image sanitization processes that validate image metadata before processing and consider implementing sandboxing techniques for image handling operations. Network segmentation and access controls should be enforced to limit exposure of systems processing image files. Additionally implementing automated monitoring for unusual memory allocation patterns and crash reports can help detect exploitation attempts. Security teams should also conduct vulnerability assessments to identify all applications using affected Exiv2 versions and ensure proper patch management procedures are in place. The fix addresses the underlying CWE-121 vulnerability by implementing proper memory bounds checking and input validation before heap allocations occur.