CVE-2018-0989 in Internet Explorer
Summary
by MITRE
An information disclosure vulnerability exists in the way that the scripting engine handles objects in memory in Internet Explorer, aka "Scripting Engine Information Disclosure Vulnerability." This affects Internet Explorer 9, Internet Explorer 11, Internet Explorer 10. This CVE ID is unique from CVE-2018-0981, CVE-2018-0987, CVE-2018-1000.
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Analysis
by VulDB Data Team • 02/09/2021
The scripting engine information disclosure vulnerability in Internet Explorer represents a critical security flaw that exploits how the browser handles object memory management during script execution. This vulnerability specifically targets the JavaScript engine's memory handling mechanisms, creating opportunities for attackers to extract sensitive information from memory locations that should remain protected. The flaw affects multiple versions of Internet Explorer including versions 9, 10, and 11, making it particularly concerning given the widespread deployment of these browsers across enterprise environments. The vulnerability operates at a fundamental level within the browser's execution environment, leveraging weaknesses in how memory objects are allocated, managed, and accessed during script processing operations.
The technical implementation of this information disclosure vulnerability stems from improper handling of object references and memory cleanup processes within Internet Explorer's scripting engine. When scripts execute and create or manipulate objects in memory, the engine fails to properly sanitize or isolate memory segments that may contain sensitive data from previous operations. This creates a scenario where attackers can potentially access memory locations that should be protected, allowing them to extract information such as encryption keys, passwords, or other confidential data that may have resided in memory during previous operations. The vulnerability is classified under CWE-200, which specifically addresses information exposure, and represents a classic example of how improper memory management can lead to information disclosure attacks. The attack vector typically involves crafting malicious scripts that can trigger the vulnerable code path and subsequently read memory contents through techniques such as memory spraying or object manipulation.
The operational impact of this vulnerability extends beyond simple information disclosure, as it can enable more sophisticated attacks when combined with other exploitation techniques. Attackers who successfully exploit this vulnerability can potentially access cached credentials, session tokens, or other sensitive data that may have been stored in memory during browser operations. This information can then be used to conduct further attacks such as credential theft, session hijacking, or privilege escalation within the compromised system. The vulnerability's presence in multiple Internet Explorer versions means that organizations with legacy systems may face extended exposure periods, as they may not immediately upgrade to newer browser versions. This makes the vulnerability particularly dangerous in enterprise environments where browser compatibility requirements may delay necessary updates and patches.
Security mitigations for this vulnerability primarily focus on applying the official Microsoft security updates and patches that address the specific memory handling flaws in the scripting engine. Organizations should implement immediate patch management procedures to ensure all affected Internet Explorer versions receive the necessary security fixes. Browser hardening measures including enabling enhanced security features, disabling unnecessary scripting capabilities, and implementing content security policies can provide additional defense layers. Network-based protections such as web application firewalls and intrusion detection systems can help identify and block exploitation attempts targeting this vulnerability. The ATT&CK framework categorizes this vulnerability under the information disclosure tactic, specifically noting how memory corruption and manipulation techniques can be used to extract sensitive data from running processes. Organizations should also consider implementing monitoring solutions that can detect unusual memory access patterns or attempts to read protected memory segments, as these behaviors may indicate exploitation attempts. Regular security assessments and penetration testing should include evaluation of browser-based vulnerabilities to ensure comprehensive protection against similar information disclosure threats.