CVE-2016-8686 in potrace
Summary
by MITRE
The bm_new function in bitmap.h in potrace 1.13 allows remote attackers to have unspecified impact via a crafted image, which triggers a memory allocation failure.
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Analysis
by VulDB Data Team • 08/08/2020
The vulnerability identified as CVE-2016-8686 resides within the potrace 1.13 library, specifically in the bm_new function located in bitmap.h. This flaw represents a memory management issue that can be exploited by remote attackers through the careful crafting of image files. The potrace library serves as a tool for tracing bitmaps into vector graphics, making it a critical component in various graphic processing workflows. When a maliciously constructed image is processed by this library, the bm_new function fails to properly handle memory allocation, potentially leading to system instability or exploitation opportunities.
The technical nature of this vulnerability stems from inadequate input validation and memory handling within the bitmap allocation routine. The bm_new function is responsible for creating new bitmap structures, but when confronted with malformed image data, it fails to properly manage memory resources. This type of flaw falls under the category of memory allocation failures, which can manifest as denial of service conditions or potentially more severe exploitation scenarios depending on the execution environment. The unspecified impact designation indicates that the consequences could vary significantly based on system configurations and how the library is integrated into larger applications.
From an operational standpoint, this vulnerability presents significant risks to systems that rely on potrace for image processing tasks. Applications that accept user-uploaded images for vector conversion, graphic design software, or automated processing pipelines could become vulnerable to remote attacks. The memory allocation failure could lead to application crashes, system instability, or in more severe cases, memory corruption that might be exploitable for privilege escalation or code execution. The remote attack vector means that adversaries can trigger this vulnerability without requiring local access, making it particularly dangerous in web-facing applications.
The vulnerability aligns with CWE-704, which covers improper handling of memory allocation failures, and represents a classic example of how seemingly benign input processing can lead to critical security issues. From an attack perspective, this flaw maps to ATT&CK technique T1203, which involves exploitation of memory corruption vulnerabilities, though the specific impact would depend on the broader system context. The issue demonstrates how memory management errors in widely-used libraries can create cascading security problems across multiple applications that depend on the affected component.
Mitigation strategies should focus on immediate patching of the potrace library to version 1.14 or later, where this vulnerability has been addressed. Organizations should also implement robust input validation and sanitization measures for any image processing workflows, particularly those involving user-uploaded content. Additionally, network segmentation and application whitelisting can help limit the potential impact of exploitation attempts. Regular security assessments of third-party libraries and maintaining updated dependency management practices are essential defensive measures. System monitoring should include detection of unusual memory allocation patterns or application crashes that could indicate exploitation attempts. The vulnerability highlights the critical importance of thorough memory management testing and input validation in security-critical software components.