CVE-2019-6007 in apng-drawable
Summary
by MITRE
Integer overflow vulnerability in apng-drawable 1.0.0 to 1.6.0 allows an attacker to cause a denial of service (DoS) condition or execute arbitrary code via unspecified vectors.
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Analysis
by VulDB Data Team • 08/22/2020
The integer overflow vulnerability identified in CVE-2019-6007 affects the apng-drawable library version 1.0.0 through 1.6.0, representing a critical security flaw that can be exploited to compromise system integrity and availability. This vulnerability resides within the library's handling of animated portable network graphics files, which are commonly used in mobile applications and web environments to display animated images. The flaw manifests when the library processes certain malformed APNG files that contain oversized or improperly structured image dimensions, leading to potential system instability and security risks.
The technical implementation of this vulnerability stems from inadequate input validation and arithmetic overflow handling within the library's image processing routines. When the apng-drawable library attempts to parse APNG files with maliciously crafted dimensions or frame counts, it performs integer arithmetic operations that exceed the maximum representable value for the data type being used. This overflow condition can result in unexpected behavior where calculated values wrap around to negative or extremely large positive numbers, creating buffer overflows or memory corruption scenarios. The vulnerability is particularly dangerous because it can be triggered through various input vectors including network downloads, file uploads, or embedded content within applications that utilize this library for image rendering.
The operational impact of this vulnerability extends beyond simple denial of service conditions to potentially enable arbitrary code execution within the context of the vulnerable application. Attackers can craft specially formatted APNG files that, when processed by the affected library, cause memory corruption that may be exploited to execute malicious code. This represents a severe security risk for mobile applications and web services that rely on the apng-drawable library for image handling, as it could allow remote attackers to gain unauthorized access to systems or compromise user data. The vulnerability affects a wide range of applications across different platforms, particularly those implementing Android or other mobile operating systems that utilize this library for animated image display functionality.
Mitigation strategies for CVE-2019-6007 should prioritize immediate library updates to versions that address the integer overflow conditions through proper input validation and overflow checking mechanisms. Organizations should implement comprehensive patch management procedures to ensure all affected applications are updated promptly, while also establishing input sanitization measures that validate image dimensions and file structures before processing. The vulnerability aligns with CWE-190, which specifically addresses integer overflow conditions, and can be mapped to ATT&CK technique T1203, involving the exploitation of software vulnerabilities for privilege escalation or code execution. Security teams should also consider implementing network-based detection measures to identify potentially malicious APNG files and establish monitoring protocols to track system behavior during image processing operations. Additionally, developers should conduct thorough code reviews and security testing to identify similar integer overflow patterns in their own codebases and implement proper bounds checking throughout all arithmetic operations involving user-supplied data.