CVE-2018-6359 in libming
Summary
by MITRE
The decompileIF function (util/decompile.c) in libming through 0.4.8 is vulnerable to a use-after-free, which may allow attackers to cause a denial of service or unspecified other impact via a crafted SWF file.
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Analysis
by VulDB Data Team • 02/02/2023
The vulnerability identified as CVE-2018-6359 affects the libming library version 0.4.8 and earlier, specifically within the decompileIF function located in util/decompile.c. This function is responsible for processing and decompiling swf files, which are widely used for multimedia content on the web. The use-after-free condition represents a critical memory safety flaw that occurs when the program continues to reference memory that has already been freed, creating potential for arbitrary code execution or system instability. The vulnerability manifests when processing maliciously crafted swf files that exploit the improper memory management within the decompileIF function, leading to unpredictable behavior in applications that utilize libming for swf file processing.
The technical implementation of this vulnerability stems from improper memory deallocation practices within the decompileIF function, which operates on the intermediate representation of swf file structures. When the function processes conditional statements within swf files, it fails to properly manage the lifecycle of allocated memory blocks, particularly those associated with if statement structures. This flaw allows attackers to craft swf files containing specially constructed conditional logic that triggers the use-after-free condition upon parsing, potentially causing the application to access freed memory locations and execute unintended operations. The vulnerability aligns with CWE-416, which specifically addresses use-after-free conditions in software systems. According to the ATT&CK framework, this represents a memory corruption technique that can be leveraged for privilege escalation or denial of service attacks within applications that process untrusted swf content.
The operational impact of CVE-2018-6359 extends beyond simple denial of service scenarios, as the use-after-free condition creates opportunities for more severe consequences including arbitrary code execution. Applications that rely on libming for swf file processing, including web browsers, content management systems, and multimedia applications, become vulnerable to remote exploitation when processing malicious swf files. The vulnerability affects not only end-user applications but also server-side processing systems that handle swf file uploads or conversions. Attackers can exploit this flaw by embedding malicious swf content in web pages or other digital assets, making it particularly dangerous in environments where untrusted content is processed. The vulnerability demonstrates the critical importance of memory safety in multimedia processing libraries, as these components often handle complex binary formats that require careful memory management to prevent exploitation.
Mitigation strategies for CVE-2018-6359 primarily involve upgrading to libming version 0.4.9 or later, which contains the necessary patches to address the use-after-free condition in the decompileIF function. System administrators should prioritize updating affected applications and libraries to prevent exploitation, particularly in environments where swf file processing occurs. Additional protective measures include implementing strict input validation for swf files, deploying web application firewalls that can detect and block malicious swf content, and establishing sandboxed environments for processing untrusted swf files. Security monitoring should focus on detecting unusual memory access patterns or application crashes that may indicate exploitation attempts. Organizations should also consider implementing automated patch management systems to ensure timely deployment of security updates. The vulnerability serves as a reminder of the importance of regular security auditing and the need for robust memory safety practices in multimedia processing libraries, particularly those handling complex binary formats that are prevalent in web-based multimedia content.