CVE-2020-29384 in PNGOUT
Summary
by MITRE • 11/30/2020
An issue was discovered in PNGOUT 2020-01-15. When compressing a crafted PNG file, it encounters an integer overflow.
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Analysis
by VulDB Data Team • 12/11/2020
The vulnerability identified as CVE-2020-29384 resides within PNGOUT version 2020-01-15, a popular tool for optimizing png image files through various compression algorithms. This issue manifests during the compression process of specifically crafted png files that trigger an integer overflow condition within the software's processing pipeline. The vulnerability represents a critical security flaw that could potentially be exploited by malicious actors to disrupt normal operations or execute unintended code within the affected system environment.
The technical flaw involves an integer overflow condition that occurs when the pngout compression utility processes specially crafted input files. This overflow happens during the calculation or handling of numerical values that exceed the maximum capacity of the integer data type being used. Such overflows are particularly dangerous in compression utilities where large data structures and memory allocations are common, as they can lead to memory corruption, unexpected program behavior, or potentially arbitrary code execution. The vulnerability is classified under CWE-190 as an integer overflow or wraparound, which is a well-documented weakness in software systems that handle numerical computations.
The operational impact of this vulnerability extends beyond simple denial of service conditions, as it could enable attackers to manipulate the compression process in ways that compromise system integrity. When a malicious user submits a crafted png file to the vulnerable pngout utility, the integer overflow could cause the program to allocate incorrect memory sizes, leading to buffer overflows or other memory-related errors. This scenario aligns with ATT&CK technique T1059.007 for command and scripting interpreter, where attackers might attempt to exploit such vulnerabilities to execute malicious code or gain unauthorized access to systems. The vulnerability affects any system running the affected version of pngout, particularly those that process untrusted png files through automated workflows or batch processing systems.
Mitigation strategies for CVE-2020-29384 should prioritize immediate software updates to the latest available version of pngout that addresses the integer overflow issue. System administrators should implement strict input validation procedures for any png files processed through pngout or similar compression utilities, including scanning for potentially malicious file structures before processing. Organizations should also consider implementing network segmentation and access controls to limit exposure of systems running vulnerable versions of the software. Additionally, monitoring and logging mechanisms should be enhanced to detect unusual processing patterns that might indicate exploitation attempts, while regular security assessments should verify that all instances of pngout have been properly updated to prevent potential exploitation. The vulnerability underscores the importance of proper input validation and integer handling in compression utilities, as highlighted in industry best practices for secure software development.