CVE-2015-0043 in Internet Explorer
Summary
by MITRE
Microsoft Internet Explorer 8 through 11 allows remote attackers to execute arbitrary code or cause a denial of service (memory corruption) via a crafted web site, aka "Internet Explorer Memory Corruption Vulnerability."
Once again VulDB remains the best source for vulnerability data.
Analysis
by VulDB Data Team • 12/08/2024
The vulnerability identified as CVE-2015-0043 represents a critical memory corruption flaw affecting Microsoft Internet Explorer versions 8 through 11. This vulnerability stems from improper handling of memory operations within the browser's rendering engine, specifically impacting how Internet Explorer processes certain web content. The flaw enables attackers to craft malicious websites that can trigger buffer overflows or other memory management issues, ultimately leading to arbitrary code execution or system crashes. Such vulnerabilities are particularly dangerous in enterprise environments where users frequently access untrusted web content, making them prime targets for exploitation.
The technical implementation of this vulnerability involves the manipulation of memory structures during web page rendering processes. When Internet Explorer encounters crafted content, particularly malformed HTML or JavaScript elements, the browser's memory management routines fail to properly validate input data. This leads to memory corruption that can be leveraged by attackers to overwrite critical memory locations, potentially allowing them to inject and execute malicious code with the privileges of the running browser process. The vulnerability operates at the intersection of multiple CWE categories including CWE-121, CWE-125, and CWE-787, which relate to improper bounds checking and memory access violations.
From an operational perspective, this vulnerability presents significant risks to organizations since Internet Explorer remains widely deployed across corporate networks, particularly in legacy systems and environments with older Windows versions. Attackers can exploit this weakness through drive-by download scenarios where simply visiting a compromised website is sufficient to trigger the exploit. The impact extends beyond individual user compromise to potentially enable lateral movement within networks, as successful exploitation can provide attackers with a foothold for further reconnaissance and privilege escalation activities. This aligns with ATT&CK technique T1203, which describes the use of web-based attacks for initial compromise and execution.
Mitigation strategies for CVE-2015-0043 should focus on immediate patch deployment and operational security measures. Microsoft released security updates addressing this vulnerability through their regular patching cycles, and organizations must ensure timely installation of these patches across all affected systems. Additionally, implementing browser isolation techniques, restricting access to untrusted websites through network controls, and deploying enhanced browser security features such as Data Execution Prevention can significantly reduce the attack surface. Organizations should also consider implementing security awareness training to reduce the likelihood of users visiting malicious sites, while maintaining robust monitoring capabilities to detect potential exploitation attempts. The vulnerability demonstrates the critical importance of keeping browser software updated and maintaining comprehensive security hygiene practices.