CVE-2018-9009 in libming
Summary
by MITRE
In libming 0.4.8, there is a use-after-free in the decompileJUMP function of the decompile.c file.
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Analysis
by VulDB Data Team • 02/24/2023
The vulnerability identified as CVE-2018-9009 represents a critical use-after-free flaw within the libming library version 0.4.8, specifically manifesting in the decompileJUMP function located within the decompile.c source file. This library serves as a SWF (Small Web Format) file manipulation tool that processes and converts flash content, making it a potential target for exploitation in environments where SWF file processing occurs. The use-after-free condition arises when memory that has been freed is subsequently accessed or referenced, creating opportunities for arbitrary code execution or system compromise.
The technical implementation of this vulnerability occurs during the decompilation process of SWF files, particularly when handling jump instructions within the bytecode. The decompileJUMP function fails to properly manage memory allocation and deallocation sequences, leading to scenarios where freed memory blocks are accessed during subsequent processing operations. This flaw stems from inadequate bounds checking and memory management practices within the library's handling of SWF file structures. The vulnerability is classified under CWE-416, which specifically addresses the use of freed memory conditions, and aligns with ATT&CK technique T1203, which involves exploitation of software vulnerabilities through memory corruption attacks.
The operational impact of CVE-2018-9009 extends beyond simple denial of service scenarios, as it presents a significant vector for remote code execution. Systems that process untrusted SWF files through libming are at risk, including web applications, content management systems, and media processing platforms that utilize this library for flash content handling. Attackers could craft malicious SWF files designed to trigger the use-after-free condition, potentially leading to complete system compromise. The vulnerability's exploitability is heightened by the widespread use of libming in various applications and the relatively simple nature of SWF file manipulation that could trigger the flaw. Organizations using this library in production environments face potential data breaches, system hijacking, and service disruption. The remediation approach requires immediate patching of the libming library to version 0.4.9 or later, which contains the necessary memory management fixes. Additionally, implementing proper input validation, sandboxing mechanisms, and restricting SWF file processing capabilities can provide defense-in-depth measures against exploitation attempts.