CVE-2017-8747 in Internet Explorer
Summary
by MITRE
Internet Explorer in Microsoft Windows 7 SP1, Windows Server 2008 R2 SP1, Windows 8.1 and Windows RT 8.1, Windows Server 2012 and R2, Windows 10 Gold, 1511, 1607, 1703, and Windows Server 2016 allows an attacker to execute arbitrary code in the context of the current user, due to the way that Internet Explorer accesses objects in memory, aka "Internet Explorer Memory Corruption Vulnerability". This CVE ID is unique from CVE-2017-8749.
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Analysis
by VulDB Data Team • 01/12/2021
The vulnerability described in CVE-2017-8747 represents a critical memory corruption flaw within Microsoft Internet Explorer that affects multiple operating system versions including Windows 7 SP1 through Windows 10 version 1703. This vulnerability falls under the CWE-125 vulnerability type, which specifically addresses out-of-bounds read conditions that can lead to memory corruption and arbitrary code execution. The flaw manifests when Internet Explorer processes objects in memory without proper validation, creating opportunities for attackers to manipulate memory contents and execute malicious code with the privileges of the current user. The vulnerability is particularly concerning as it affects widely deployed operating systems and can be exploited through web-based attacks without requiring user interaction beyond visiting a malicious website.
The technical exploitation of this vulnerability occurs through Internet Explorer's handling of memory objects during web page rendering and script execution processes. When the browser encounters certain malformed or crafted web content, it fails to properly validate memory boundaries, leading to memory corruption that attackers can leverage to inject and execute arbitrary code. This memory corruption typically involves heap-based buffer overflows or use-after-free conditions that allow attackers to overwrite critical memory locations and redirect execution flow. The vulnerability is classified as a remote code execution flaw because it can be triggered through web-based attacks without requiring local system access, making it particularly dangerous in enterprise environments where users frequently browse the internet. The ATT&CK framework categorizes this vulnerability under T1059.007 for scripting and T1203 for exploitation for execution, highlighting its potential for automated exploitation and lateral movement within networks.
The operational impact of CVE-2017-8747 extends beyond simple privilege escalation as it provides attackers with a persistent foothold in compromised systems that can be used for further malicious activities. Once successfully exploited, the vulnerability allows attackers to execute code with the same privileges as the logged-in user, potentially leading to complete system compromise if the user has administrative rights. The vulnerability affects both desktop and server operating systems, making it relevant to organizations running various Windows deployments including legacy systems. Security professionals must consider this vulnerability as part of comprehensive threat modeling exercises, particularly when assessing risks associated with web browsing activities and unpatched systems. The vulnerability's presence in multiple Windows versions means that organizations must implement layered security controls, including web filtering, browser hardening, and regular patch management to mitigate potential exploitation.
Mitigation strategies for CVE-2017-8747 should include immediate deployment of Microsoft security updates and patches that address the specific memory corruption issue in Internet Explorer. Organizations should also implement browser hardening measures such as disabling unnecessary browser features, implementing content security policies, and deploying enhanced web filtering solutions to prevent access to malicious websites. The vulnerability's classification as a critical remote code execution flaw necessitates proactive security measures including network segmentation, endpoint detection and response solutions, and regular vulnerability assessments to identify unpatched systems. Security teams should also consider implementing automated patch management processes and maintaining up-to-date threat intelligence feeds to monitor for exploitation attempts targeting this vulnerability. Additionally, user education regarding safe browsing practices and the importance of keeping systems updated remains crucial in defending against exploitation attempts that rely on user interaction with malicious web content.