CVE-2016-8697 in potrace
Summary
by MITRE
The bm_new function in bitmap.h in potrace before 1.13 allows remote attackers to cause a denial of service (divide-by-zero error and crash) via a crafted BMP image.
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Analysis
by VulDB Data Team • 08/08/2020
The vulnerability identified as CVE-2016-8697 resides within the potrace library version 1.12 and earlier, specifically in the bitmap.h header file's bm_new function. This flaw represents a classic divide-by-zero error that can be exploited through maliciously crafted BMP image files, leading to system instability and potential denial of service conditions. The potrace library serves as a utility for tracing bitmaps into vector graphics, making it a critical component in various graphic processing workflows and document conversion systems.
The technical implementation of this vulnerability stems from improper input validation within the bm_new function which processes bitmap data structures. When a remote attacker submits a specially crafted BMP image file, the function fails to properly handle edge cases in the image dimensions or metadata, resulting in a division operation where the denominator becomes zero. This mathematical error causes the application to crash immediately upon processing the malformed input, effectively rendering the service unavailable to legitimate users. The flaw operates at the level of basic arithmetic operations and memory management within the bitmap processing pipeline, making it particularly dangerous in network-facing applications that process user-uploaded content.
From an operational perspective, this vulnerability creates significant risks for systems that rely on potrace for image conversion or vector graphics processing. The remote attack surface allows adversaries to exploit the flaw without requiring local access, making it particularly concerning for web applications, document processing services, and any system that accepts and processes BMP image uploads. The denial of service impact extends beyond simple service interruption, as the crash can potentially lead to cascading failures in dependent systems and may provide attackers with opportunities for further exploitation attempts. This vulnerability aligns with CWE-369, which categorizes divide-by-zero errors as a fundamental flaw in input validation and error handling mechanisms.
Security professionals should consider this vulnerability in the context of the ATT&CK framework, particularly under the T1499.004 technique for "Endpoint Denial of Service" and the T1059.007 technique for "Command and Scripting Interpreter: PowerShell" as attackers may leverage such flaws to establish persistent denial of service conditions. The vulnerability demonstrates the critical importance of robust input validation and error handling in cryptographic and graphic processing libraries, as these components often form the foundation of broader security infrastructures. Organizations should prioritize immediate patching of affected systems, implement network-based intrusion detection rules targeting suspicious BMP file patterns, and consider deploying application firewalls to prevent exploitation attempts. Additionally, the incident highlights the necessity of comprehensive testing procedures including fuzzing and input validation checks to identify similar vulnerabilities in other bitmap processing libraries and graphic manipulation utilities.
The broader implications of CVE-2016-8697 extend to software supply chain security considerations, as many applications depend on potrace for vector conversion capabilities. System administrators should conduct thorough inventory checks to identify all systems using vulnerable versions of potrace, while security teams should monitor for exploitation attempts and implement appropriate network segmentation to limit the potential impact of successful attacks. The vulnerability serves as a reminder of the critical need for maintaining up-to-date cryptographic libraries and implementing proper security controls around file processing operations in network-facing applications.