CVE-2017-8522 in Internet Explorer
Summary
by MITRE
Microsoft browsers in Microsoft Windows 8.1 and Windows RT 8.1, Windows Server 2012 and R2, Windows 10 Gold, 1511, 1607, and 1703, and Windows Server 2016 allow an allow an attacker to execute arbitrary code in the context of the current user when the JavaScript engines fail to render when handling objects in memory in Microsoft browsers, aka "Scripting Engine Memory Corruption Vulnerability". This CVE ID is unique from CVE-2017-8517 and CVE-2017-8524.
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Analysis
by VulDB Data Team • 12/27/2020
The vulnerability described in CVE-2017-8522 represents a critical memory corruption flaw within Microsoft's JavaScript engines that affects multiple operating systems including Windows 8.1, Windows RT 8.1, Windows Server 2012 and R2, Windows 10 versions 1511, 1607, and 1703, as well as Windows Server 2016. This issue stems from the improper handling of objects in memory during JavaScript execution, creating a condition where an attacker can potentially execute arbitrary code with the privileges of the currently logged-in user. The vulnerability is categorized under CWE-125, which specifically addresses out-of-bounds read conditions that can lead to memory corruption and arbitrary code execution. The flaw manifests when the scripting engines fail to properly render objects in memory, creating a predictable pattern that adversaries can exploit to gain unauthorized system access.
The operational impact of this vulnerability extends beyond simple privilege escalation as it provides attackers with a pathway to establish persistent access within targeted environments. When exploited successfully, the vulnerability allows for remote code execution without requiring additional authentication, making it particularly dangerous in enterprise environments where users may inadvertently visit malicious websites or open compromised attachments. The attack surface is broad given that the affected systems include widely deployed operating systems and the vulnerability affects the core JavaScript engines that power web browsers and applications. According to ATT&CK framework, this vulnerability maps to T1059.007 for Scripting and T1068 for Exploitation for Privilege Escalation, demonstrating how attackers can leverage this flaw to move laterally within networks and establish footholds for more extensive breaches.
Mitigation strategies for CVE-2017-8522 should prioritize immediate patch deployment through Microsoft's regular security updates, as the vulnerability has been addressed through cumulative updates released in August 2017. Organizations should implement network segmentation and web filtering controls to limit exposure to potentially malicious content, while also maintaining robust endpoint detection and response capabilities to identify exploitation attempts. Security teams should conduct regular vulnerability assessments to ensure all affected systems are properly updated and monitor for indicators of compromise related to this vulnerability. The remediation process should include comprehensive testing of patches in controlled environments before widespread deployment to avoid potential compatibility issues with legacy applications. Additionally, user education regarding safe browsing practices and the importance of keeping systems updated remains crucial in reducing the attack surface for this and similar vulnerabilities.