CVE-2018-9144 in Exiv2
Summary
by MITRE
In Exiv2 0.26, there is an out-of-bounds read in Exiv2::Internal::binaryToString in image.cpp. It could result in denial of service or information disclosure.
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Analysis
by VulDB Data Team • 02/24/2023
The vulnerability identified as CVE-2018-9144 represents a critical out-of-bounds read flaw within the Exiv2 image processing library version 0.26. This issue manifests in the Exiv2::Internal::binaryToString function located within the image.cpp source file, where improper input validation leads to memory access violations that can be exploited by malicious actors. The flaw stems from inadequate bounds checking during the processing of image metadata, particularly when handling binary data within various image formats. The vulnerability is classified under CWE-125 as an out-of-bounds read, which occurs when a program attempts to access memory beyond the allocated buffer boundaries. This type of vulnerability is particularly dangerous in image processing libraries since they often handle untrusted input from various file formats, making them prime targets for exploitation.
The operational impact of this vulnerability extends beyond simple denial of service to potentially enable information disclosure attacks. When an attacker crafts a malicious image file containing specially crafted metadata, the vulnerable Exiv2 library will attempt to process this data and read memory locations that fall outside the intended buffer boundaries. This behavior can result in the exposure of sensitive information from adjacent memory regions, including stack contents, heap data, or other process memory segments. The denial of service aspect occurs when the out-of-bounds read causes the application to crash or become unresponsive, effectively rendering the vulnerable software unusable. This type of vulnerability is particularly concerning in applications that process user-uploaded images, such as web applications, content management systems, or media processing services, where attackers can leverage this flaw to disrupt service availability or extract confidential information.
From an adversarial perspective, this vulnerability aligns with ATT&CK technique T1203 (Exploitation for Client Execution) and T1059 (Command and Scripting Interpreter) as attackers can leverage the out-of-bounds read to execute arbitrary code or gain unauthorized access to system resources. The vulnerability is particularly relevant in environments where Exiv2 is integrated into larger applications, as it can serve as a foothold for more sophisticated attacks. Security professionals should note that this flaw demonstrates the importance of robust input validation and memory safety practices in image processing libraries. The vulnerability highlights the need for comprehensive testing of boundary conditions and proper error handling in low-level libraries that process binary data. Organizations using Exiv2 version 0.26 or earlier should prioritize immediate remediation through patch updates, as the vulnerability can be exploited remotely through web applications or other systems that process image metadata without proper sanitization. The flaw also underscores the broader challenge of maintaining memory safety in C++ applications, particularly those dealing with complex binary formats and untrusted input data streams that are common in multimedia processing environments.
This vulnerability exemplifies the critical nature of memory safety issues in widely-used libraries, as demonstrated by the potential for both availability and confidentiality impacts. The flaw's exploitation requires careful crafting of malicious image files that trigger the specific code path in the binaryToString function, making it a targeted vulnerability rather than a broad class of issues. However, given the widespread adoption of Exiv2 in various applications, the potential attack surface remains significant. The remediation approach should focus on implementing proper bounds checking, utilizing modern memory-safe programming practices, and conducting thorough security testing of input processing functions. Organizations should also consider implementing additional security controls such as input sanitization, sandboxing, and regular vulnerability assessments to protect against similar issues in other components of their software stack. The vulnerability serves as a reminder of the critical importance of maintaining up-to-date libraries and implementing comprehensive security measures throughout the software development lifecycle to prevent exploitation of memory safety flaws in image processing and other binary data handling components.