CVE-2018-8289 in Edge
Summary
by MITRE
An information disclosure vulnerability exists when Microsoft Edge improperly handles objects in memory, aka "Microsoft Edge Information Disclosure Vulnerability." This affects Microsoft Edge. This CVE ID is unique from CVE-2018-8297, CVE-2018-8324, CVE-2018-8325.
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Analysis
by VulDB Data Team • 04/05/2023
The vulnerability identified as CVE-2018-8289 represents a critical information disclosure flaw within Microsoft Edge browser that stems from improper memory object handling during web page rendering processes. This vulnerability specifically targets the browser's memory management mechanisms, where Microsoft Edge fails to properly validate or sanitize object references in memory, potentially exposing sensitive data to malicious actors. The flaw exists in the browser's JavaScript engine and rendering pipeline, where memory objects that should be properly isolated or destroyed are instead accessible through specific exploitation techniques. Security researchers have classified this as a memory corruption vulnerability that could allow attackers to extract information from memory locations that should remain protected, making it particularly dangerous in targeted attack scenarios.
The technical exploitation of CVE-2018-8289 occurs when a malicious website crafts specific JavaScript code that triggers the browser's memory handling routines in an unintended manner. This allows attackers to perform memory reads from locations that should be protected, potentially accessing sensitive information such as cryptographic keys, user credentials, or other confidential data stored in memory. The vulnerability is particularly concerning because it operates at the memory management level, where traditional security controls may not effectively prevent unauthorized access to memory contents. The flaw is categorized under CWE-200, which specifically addresses "Information Exposure" vulnerabilities, where systems inadvertently provide access to information that should remain confidential. This classification indicates that the vulnerability fundamentally violates information security principles by creating unintended data exposure pathways.
From an operational perspective, the impact of CVE-2018-8289 extends beyond simple information disclosure, as it can serve as a stepping stone for more sophisticated attacks within the attack chain. The vulnerability aligns with ATT&CK technique T1059.001 for "Command and Scripting Interpreter: JavaScript" where attackers leverage browser-based scripting to execute malicious code, and T1068 for "Exploitation for Privilege Escalation" when the information disclosure leads to further exploitation opportunities. Organizations running Microsoft Edge browsers are at risk of data breaches, credential theft, and potential system compromise when this vulnerability is exploited. The attack surface is particularly broad since Edge is widely deployed across enterprise environments and consumer devices, making the potential impact significant for both organizations and individual users who may encounter malicious websites or phishing campaigns.
Mitigation strategies for CVE-2018-8289 should prioritize immediate patch deployment through Microsoft's regular security updates, as the vendor released specific fixes for this vulnerability in their monthly security bulletin. Organizations should implement browser hardening measures such as disabling unnecessary JavaScript features, implementing strict content security policies, and deploying web application firewalls that can detect and block malicious JavaScript patterns. Network-based protections can include implementing sandboxing mechanisms for web browsing activities and using advanced threat detection systems that monitor for anomalous memory access patterns. Security teams should also consider implementing user education programs to reduce the risk of users visiting malicious websites that could exploit this vulnerability. Additionally, regular security assessments should include testing for this specific vulnerability through automated scanning tools that can detect the presence of vulnerable browser versions and ensure that all systems are properly patched and updated to prevent exploitation attempts.