CVE-2017-8662 in Edge
Summary
by MITRE
Microsoft Edge in Microsoft Windows 10 1703 allows an attacker to disclose information due to how strings are validated in specific scenarios, aka "Microsoft Edge Information Disclosure Vulnerability". This CVE ID is unique from CVE-2017-8644 and CVE-2017-8652.
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Analysis
by VulDB Data Team • 08/23/2024
The vulnerability identified as CVE-2017-8662 represents a critical information disclosure flaw within Microsoft Edge browser when running on Windows 10 version 1703. This vulnerability stems from improper validation of string data structures during specific operational scenarios, creating an avenue for attackers to potentially extract sensitive information from the affected system. The flaw specifically impacts the browser's handling of string validation processes, which forms a fundamental component of web rendering and JavaScript execution within the Edge engine. Security researchers have classified this issue as part of a broader category of vulnerabilities affecting web browser implementations, with distinct characteristics from similar flaws such as CVE-2017-8644 and CVE-2017-8652 that affect different aspects of the same browser architecture.
The technical exploitation of this vulnerability occurs through carefully crafted string inputs that trigger memory corruption or information leakage mechanisms within Edge's rendering engine. When the browser processes malformed or specially constructed strings, the validation routines fail to properly sanitize input data, potentially allowing adjacent memory contents to be exposed through various attack vectors. This type of information disclosure can reveal sensitive data such as memory addresses, cryptographic keys, or other confidential information that may aid in further exploitation attempts. The vulnerability's impact is particularly concerning because it operates at the core level of browser functionality where user interactions with web content are processed, making it accessible through standard web browsing activities without requiring specialized privileges or advanced attack techniques.
From an operational perspective, this vulnerability creates significant risks for users who engage with untrusted web content, as the information disclosure can occur during normal browsing sessions. Attackers can leverage this weakness by hosting malicious web pages that trigger the vulnerable string validation logic, potentially leading to the exposure of sensitive data that could be used for privilege escalation or additional attack vectors. The vulnerability's presence in Windows 10 version 1703 means that a substantial user base remains at risk, particularly since this version was widely deployed in enterprise environments. Security professionals should note that this issue demonstrates the importance of proper input validation and memory management in browser implementations, aligning with common weakness patterns identified in the CWE database under categories related to improper input validation and information exposure.
The exploitation of CVE-2017-8662 can be mapped to various tactics within the MITRE ATT&CK framework, particularly under the information gathering and privilege escalation phases. Attackers may use this vulnerability to collect system information that could be leveraged in subsequent attacks, potentially leading to more sophisticated exploitation techniques. Organizations should consider this vulnerability as part of their broader security posture assessment, especially in environments where users have access to potentially malicious web content. The vulnerability's remediation requires Microsoft to implement proper string validation mechanisms and memory protection schemes within the Edge browser, aligning with industry best practices for preventing information disclosure vulnerabilities. Security teams should prioritize patch management for this issue, as the window of opportunity for exploitation remains open until the official security updates are deployed across affected systems.
This vulnerability underscores the critical nature of web browser security in modern computing environments where browsers serve as primary attack surfaces for numerous cyber threats. The information disclosure aspect of CVE-2017-8662 highlights the need for robust input validation mechanisms and proper memory management practices in browser implementations. Organizations should implement comprehensive monitoring and detection capabilities to identify potential exploitation attempts, while also maintaining updated security measures that address the underlying root causes of such vulnerabilities. The remediation process for this issue typically involves applying Microsoft's security patches and updates, which address the specific string validation flaws that enable the information disclosure behavior.