CVE-2011-1260 in Internet Explorer
Summary
by MITRE
Microsoft Internet Explorer 8 and 9 does not properly handle objects in memory, which allows remote attackers to execute arbitrary code by accessing an object that (1) was not properly initialized or (2) is deleted, aka "Layout Memory Corruption Vulnerability."
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Analysis
by VulDB Data Team • 06/04/2025
The vulnerability identified as CVE-2011-1260 represents a critical memory corruption flaw within Microsoft Internet Explorer versions 8 and 9, classified under CWE-125 as an "Out-of-bounds Read" condition that manifests through improper memory handling. This vulnerability stems from the browser's inadequate management of object lifecycle within memory structures, creating exploitable conditions where attackers can manipulate memory access patterns to achieve arbitrary code execution. The flaw specifically occurs when the browser encounters objects that either fail to initialize properly during allocation or have been prematurely deallocated, leading to unpredictable memory states that can be leveraged by malicious actors.
The technical exploitation of this vulnerability involves crafting malicious web content that triggers the browser's memory management routines in such a way that it accesses improperly initialized or deleted memory objects. When Internet Explorer attempts to process these malformed objects, the memory corruption creates opportunities for attackers to inject and execute arbitrary code within the context of the user's session. This memory corruption typically occurs during layout rendering processes where the browser's rendering engine handles object references and memory allocation, making it particularly dangerous as it can be triggered through standard web browsing activities.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with a persistent foothold within target systems. The attack vector requires only a user visiting a malicious website, making it particularly effective for phishing campaigns and drive-by download attacks. The vulnerability's exploitation can lead to complete system compromise, allowing attackers to install malware, steal sensitive information, or establish persistent backdoors. Security researchers have noted that the vulnerability's exploitation often requires minimal user interaction, making it particularly dangerous in enterprise environments where users may inadvertently encounter malicious content.
Mitigation strategies for CVE-2011-1260 should focus on immediate patch deployment and browser security hardening measures. Microsoft released security updates addressing this vulnerability through Windows Update, and organizations should ensure all systems receive these patches promptly. Additional protective measures include implementing enhanced browser security configurations, enabling protected mode features, and deploying intrusion detection systems to monitor for exploitation attempts. The vulnerability aligns with ATT&CK technique T1203, "Exploitation for Client Execution," as it represents a classic client-side exploit that leverages browser vulnerabilities to execute malicious code. Organizations should also consider implementing web application firewalls and content filtering solutions to prevent access to known malicious domains that may host exploit code for this vulnerability.