CVE-2018-8509 in Edge
Summary
by MITRE
A remote code execution vulnerability exists when Microsoft Edge improperly accesses objects in memory, aka "Microsoft Edge Memory Corruption Vulnerability." This affects Microsoft Edge. This CVE ID is unique from CVE-2018-8473.
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Analysis
by VulDB Data Team • 05/23/2023
The vulnerability identified as CVE-2018-8509 represents a critical memory corruption flaw in Microsoft Edge browser that enables remote code execution under specific conditions. This vulnerability stems from improper handling of object references within the browser's memory management system, creating opportunities for malicious actors to exploit the software's memory access patterns. The issue specifically affects Microsoft Edge versions prior to the security updates released in August 2018, making it a significant concern for organizations relying on this browser for daily operations.
The technical root cause of this vulnerability lies in how Microsoft Edge processes and manages memory objects during browser operations, particularly when handling certain JavaScript constructs or web page elements. According to CWE-125, this vulnerability manifests as an out-of-bounds read condition where the browser attempts to access memory locations that are not properly allocated or validated. The flaw occurs when the browser's scripting engine fails to properly validate object references before accessing associated memory segments, leading to potential memory corruption that can be leveraged by attackers.
The operational impact of CVE-2018-8509 extends beyond simple browser compromise, as it can enable attackers to execute arbitrary code on affected systems with the privileges of the Edge browser process. This represents a significant threat vector in enterprise environments where Edge is commonly used for web browsing and internal applications. Attackers can craft malicious web pages that, when loaded in Edge, trigger the memory corruption condition and subsequently execute malicious payloads. The vulnerability's remote nature means that exploitation can occur without any local interaction from the user, making it particularly dangerous in targeted attack scenarios.
Security researchers have classified this vulnerability under the MITRE ATT&CK framework as part of the 'Exploitation for Client Execution' technique, where adversaries leverage software vulnerabilities to execute malicious code on target systems. The vulnerability's characteristics align with the T1203 pattern of exploitation through web-based attacks, particularly when combined with social engineering tactics to deliver malicious content. Organizations affected by this vulnerability should prioritize immediate patching and implementation of network-based protections to prevent exploitation attempts.
Mitigation strategies for CVE-2018-8509 should include immediate deployment of Microsoft's security patches released in August 2018, along with network segmentation and web filtering solutions that can detect and block malicious content. Browser hardening measures such as enabling Enhanced Protected Mode and implementing strict content security policies can provide additional defense layers. Security monitoring should focus on detecting unusual memory access patterns and browser process behaviors that might indicate exploitation attempts. Organizations should also consider implementing zero-trust network architectures that limit the potential impact of successful exploitation attempts, particularly in environments where Edge is used for accessing sensitive corporate resources.