CVE-2017-15601 in Libextractor
Summary
by MITRE
In GNU Libextractor 1.4, there is a heap-based buffer overflow in the EXTRACTOR_png_extract_method function in plugins/png_extractor.c, related to processiTXt and stndup.
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Analysis
by VulDB Data Team • 01/04/2023
The heap-based buffer overflow vulnerability in GNU Libextractor 1.4 represents a critical security flaw that can be exploited to compromise systems processing image metadata. This vulnerability specifically affects the EXTRACTOR_png_extract_method function within the plugins/png_extractor.c module, making it a targeted attack surface for adversaries seeking to exploit image processing applications. The flaw manifests during the handling of processiTXt and stndup data structures within png image files, creating opportunities for memory corruption that could lead to arbitrary code execution. The vulnerability stems from inadequate bounds checking when processing specific png metadata fields, particularly those containing international text information that requires special handling during extraction processes.
The technical implementation of this vulnerability involves the improper management of heap memory allocations when parsing png image files that contain processiTXt chunks. These chunks store international text information in a format that requires special processing, and the stndup function handles string duplication operations that fail to validate input lengths against allocated buffer boundaries. When a maliciously crafted png file contains oversized or malformed processiTXt data, the extraction function fails to properly bounds-check the incoming data, leading to heap memory corruption that can be leveraged for privilege escalation or system compromise. This type of vulnerability falls under CWE-121 heap-based buffer overflow, which is classified as a memory safety issue that allows attackers to overwrite adjacent memory locations.
The operational impact of this vulnerability extends beyond simple denial of service scenarios, as it creates potential pathways for remote code execution within applications that utilize GNU Libextractor for metadata processing. Systems processing png images, including web applications, content management systems, and digital asset management platforms, become vulnerable to exploitation when they rely on this library for image metadata extraction. Attackers can craft malicious png files that trigger the buffer overflow during normal image processing operations, potentially allowing them to execute arbitrary code with the privileges of the affected application. This vulnerability particularly affects environments where automated image processing occurs, such as social media platforms, online marketplaces, and content aggregation services that automatically extract metadata from uploaded images.
Mitigation strategies for this vulnerability require immediate patching of affected GNU Libextractor installations to the latest stable versions that contain proper bounds checking implementations. System administrators should also implement input validation measures that filter or sanitize png image files before processing, particularly focusing on metadata fields that trigger the vulnerable code paths. Network-based defenses can include content filtering mechanisms that block suspicious image files or implement sandboxing techniques for image processing operations. The vulnerability demonstrates the importance of proper memory management in image processing libraries and highlights the need for robust input validation in metadata extraction functions. Organizations should also consider implementing automated vulnerability scanning tools that can identify systems running vulnerable versions of GNU Libextractor and ensure that all image processing pipelines are updated to prevent exploitation. This vulnerability aligns with ATT&CK techniques related to exploitation of memory corruption vulnerabilities and emphasizes the critical nature of maintaining up-to-date security patches for third-party libraries used in image processing workflows.