CVE-2018-8588 in Edge
Summary
by MITRE
A remote code execution vulnerability exists in the way that the Chakra scripting engine handles objects in memory in Microsoft Edge, aka "Chakra Scripting Engine Memory Corruption Vulnerability." This affects Microsoft Edge, ChakraCore. This CVE ID is unique from CVE-2018-8541, CVE-2018-8542, CVE-2018-8543, CVE-2018-8551, CVE-2018-8555, CVE-2018-8556, CVE-2018-8557.
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Analysis
by VulDB Data Team • 06/05/2023
The vulnerability identified as CVE-2018-8588 represents a critical memory corruption flaw within Microsoft Edge's Chakra scripting engine, which serves as the JavaScript engine powering the browser's execution environment. This vulnerability specifically manifests when the Chakra engine processes objects in memory, creating conditions that could allow malicious actors to execute arbitrary code remotely without user interaction. The issue affects not only Microsoft Edge but also ChakraCore, which is Microsoft's open-source JavaScript engine used in various applications beyond the browser. The vulnerability's classification as a remote code execution flaw places it within the high-risk category of security vulnerabilities, as it enables attackers to gain complete control over affected systems without requiring physical access or user consent.
The technical root cause of this vulnerability lies in how the Chakra scripting engine manages memory allocation and object handling during JavaScript execution. When processing certain JavaScript objects, the engine fails to properly validate memory boundaries, leading to potential buffer overflows or memory corruption scenarios. This memory management flaw allows attackers to manipulate the engine's internal state through crafted JavaScript code that triggers the vulnerable code path. The vulnerability is particularly dangerous because it operates at the engine level, meaning that successful exploitation can bypass typical browser security boundaries and potentially provide attackers with elevated privileges on the target system. According to CWE standards, this vulnerability maps to CWE-125, which describes "Out-of-bounds Read," and CWE-787, which covers "Out-of-bounds Write," both of which are common indicators of memory corruption vulnerabilities in software systems.
The operational impact of CVE-2018-8588 extends beyond simple browser exploitation, as it represents a significant threat vector for advanced persistent threats and zero-day attacks. Attackers can leverage this vulnerability through malicious websites, email attachments, or even compromised web applications that load malicious JavaScript code into Microsoft Edge. The remote nature of the exploit means that users do not need to perform any suspicious actions to be compromised, as simply visiting a malicious webpage can trigger the vulnerability. This characteristic aligns with ATT&CK framework techniques such as T1203 (Exploitation for Client Execution) and T1059 (Command and Scripting Interpreter), where adversaries use browser-based exploits to establish initial access. The vulnerability's presence in both Microsoft Edge and ChakraCore creates a broader attack surface, as any application utilizing ChakraCore could potentially be affected, including various Microsoft products and third-party applications that integrate the engine.
Mitigation strategies for CVE-2018-8588 primarily focus on immediate patching and operational security measures. Microsoft released security updates that addressed the memory corruption issue by correcting the object handling routines within the Chakra engine, including enhanced memory validation and boundary checking mechanisms. Organizations should prioritize applying these security patches across all affected systems, particularly those running Microsoft Edge or applications using ChakraCore. Additional defensive measures include implementing browser security controls such as sandboxing, content security policies, and restricting JavaScript execution in sensitive environments. Network-level protections such as web application firewalls and intrusion detection systems can help detect and block exploitation attempts. From an ATT&CK perspective, defensive strategies should emphasize T1566 (Phishing for Information) awareness training to prevent users from visiting malicious sites, along with T1090 (Proxy逃避) monitoring to detect potential command and control communications that may result from successful exploitation. The vulnerability also underscores the importance of keeping all software components updated, as the Chakra engine's exposure in multiple products creates cascading risks that extend far beyond the initial browser application.