CVE-2019-0771 in Edge
Summary
by MITRE
A remote code execution vulnerability exists in the way that the scripting engine handles objects in memory in Microsoft Edge, aka 'Scripting Engine Memory Corruption Vulnerability'. This CVE ID is unique from CVE-2019-0609, CVE-2019-0639, CVE-2019-0680, CVE-2019-0769, CVE-2019-0770, CVE-2019-0773, CVE-2019-0783.
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Analysis
by VulDB Data Team • 07/31/2023
This vulnerability represents a critical memory corruption issue within Microsoft Edge's scripting engine that enables remote code execution attacks. The flaw occurs during the handling of objects in memory, specifically when the engine processes certain JavaScript objects that leads to improper memory management and potential code execution by malicious actors. The vulnerability affects Microsoft Edge versions including EdgeHTML 18.18362 and earlier versions, making it particularly dangerous as it targets the browser's core execution environment where user interactions occur. The technical nature of this vulnerability allows attackers to manipulate memory structures through crafted web content, potentially leading to complete system compromise. This issue is classified under CWE-125, which represents an out-of-bounds read condition, and aligns with ATT&CK technique T1203, specifically targeting the exploitation of memory corruption vulnerabilities in browser environments.
The operational impact of this vulnerability extends beyond simple browser compromise, as successful exploitation can lead to full system control through arbitrary code execution. Attackers can leverage this flaw by hosting malicious web content that, when loaded in Microsoft Edge, triggers the memory corruption condition. The vulnerability's remote nature means that users can be compromised simply by visiting malicious websites or clicking on compromised links, without requiring any additional user interaction beyond normal browsing behavior. This makes it particularly dangerous in phishing campaigns or when users visit compromised websites. The memory corruption aspect allows attackers to manipulate the browser's execution flow and potentially inject malicious code that can persist across sessions or escalate privileges to gain deeper system access.
Mitigation strategies for this vulnerability should focus on immediate patching of affected Microsoft Edge versions, as Microsoft released security updates to address this specific memory corruption issue. Organizations should implement network-based protections such as web application firewalls that can detect and block malicious JavaScript patterns associated with exploitation attempts. Browser hardening measures including disabling unnecessary JavaScript features, implementing strict content security policies, and using sandboxing techniques can reduce the attack surface. Additionally, security monitoring should include detection of anomalous memory access patterns or unusual JavaScript execution behavior that might indicate exploitation attempts. Network segmentation and user education regarding safe browsing practices remain essential defensive measures. The vulnerability demonstrates the critical importance of maintaining up-to-date browser security patches and implementing layered defensive strategies to protect against sophisticated browser-based attacks that exploit fundamental memory management flaws in web rendering engines.