CVE-2018-8500 in ChakraCore
Summary
by MITRE
A remote code execution vulnerability exists in the way that the ChakraCore scripting engine handles objects in memory, aka "Scripting Engine Memory Corruption Vulnerability." This affects ChakraCore.
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Analysis
by VulDB Data Team • 03/31/2020
The vulnerability identified as CVE-2018-8500 represents a critical remote code execution flaw within Microsoft's ChakraCore JavaScript engine, which serves as the core scripting component for various Microsoft applications including Edge browser, Node.js, and Universal Windows Platform applications. This memory corruption vulnerability stems from improper handling of objects during script execution, creating opportunities for attackers to execute arbitrary code on affected systems. The issue specifically manifests when ChakraCore processes certain JavaScript objects in memory, leading to unpredictable behavior that can be exploited by malicious actors.
The technical nature of this vulnerability falls under CWE-125, which describes out-of-bounds read conditions where the ChakraCore engine fails to properly validate memory access when processing JavaScript objects. Attackers can craft malicious JavaScript code that triggers memory corruption during object manipulation, potentially leading to heap-based buffer overflows or memory corruption that allows for code execution. The vulnerability is particularly dangerous because it operates within the scripting engine itself, meaning that any application relying on ChakraCore for JavaScript processing becomes susceptible to exploitation. This includes Microsoft Edge browser, Node.js applications, and various UWP applications that utilize the engine.
The operational impact of CVE-2018-8500 extends beyond simple remote code execution, as it can be leveraged in sophisticated attack chains that align with ATT&CK framework techniques such as T1059 for command and control execution and T1190 for exploitation of remote services. The vulnerability affects multiple Microsoft products and platforms, making it a high-priority target for threat actors seeking to compromise systems at scale. When successfully exploited, attackers can gain full system control, potentially leading to data breaches, system compromise, or deployment of additional malware. The remote nature of the vulnerability means that attackers do not require local system access to exploit it, making it particularly dangerous for web-based applications and services.
Mitigation strategies for CVE-2018-8500 should prioritize immediate patching of affected Microsoft products, particularly Edge browser, Node.js, and any UWP applications utilizing ChakraCore. Organizations should implement network segmentation and monitoring to detect potential exploitation attempts, as well as maintain updated threat intelligence feeds to identify malicious JavaScript patterns. The vulnerability also highlights the importance of secure coding practices and memory safety validation in scripting engines, aligning with industry standards that emphasize proper bounds checking and memory management. Security teams should conduct thorough vulnerability assessments of all applications that rely on ChakraCore and implement application whitelisting where possible to prevent execution of untrusted JavaScript code. Additionally, browser isolation techniques and sandboxing mechanisms can provide additional layers of protection against exploitation attempts targeting this memory corruption vulnerability.