CVE-2011-1346 in Internet Explorer
Summary
by MITRE
Unspecified vulnerability in Microsoft Internet Explorer 8 on Windows 7 allows remote attackers to execute arbitrary code via unknown vectors, as demonstrated by Stephen Fewer as the second of three chained vulnerabilities during a Pwn2Own competition at CanSecWest 2011.
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Analysis
by VulDB Data Team • 10/19/2021
The vulnerability identified as CVE-2011-1346 represents a critical security flaw in Microsoft Internet Explorer 8 running on Windows 7 operating systems. This unspecified weakness was particularly significant because it was exploited during high-profile security competitions, demonstrating its potential for serious exploitation in real-world scenarios. The vulnerability's discovery and exploitation during the Pwn2Own competition at CanSecWest 2011 highlighted the dangerous nature of zero-day exploits that could be leveraged by malicious actors to compromise systems remotely. The fact that this vulnerability was part of a three-part chained attack sequence underscores the sophisticated nature of modern exploit development and the interconnectedness of security weaknesses in complex software ecosystems.
The technical nature of this vulnerability remains unspecified in the public description, which is typical for certain classes of exploits that are particularly dangerous or have not been fully disclosed to prevent further exploitation. However, given that it was demonstrated in a competitive environment involving Internet Explorer 8, the vulnerability likely involved memory corruption issues that could be triggered through crafted web content. The attack vectors were not explicitly defined, but such vulnerabilities typically involve buffer overflows, use-after-free conditions, or other memory management errors that allow attackers to execute arbitrary code with the privileges of the targeted browser process. This type of vulnerability falls under the broader category of heap-based buffer overflows and memory corruption issues that have been extensively documented in cybersecurity literature and classified under CWE-119 and CWE-121 categories.
The operational impact of CVE-2011-1346 was severe and far-reaching, as it provided attackers with a pathway to achieve remote code execution on systems running vulnerable versions of Internet Explorer. The ability to execute arbitrary code remotely represents one of the most dangerous threat vectors available to cybercriminals, as it allows for complete system compromise without requiring physical access or user interaction beyond visiting a malicious website. Organizations running Windows 7 systems with Internet Explorer 8 were particularly vulnerable, as these configurations were widely deployed in enterprise environments where the attack surface was extensive. The vulnerability's exploitation during a security competition demonstrated that even systems with up-to-date security measures could be compromised if they were running vulnerable software versions, highlighting the importance of comprehensive patch management and the need for organizations to maintain current security postures.
The exploitation techniques employed for this vulnerability align with established attack patterns documented in the MITRE ATT&CK framework, particularly those involving initial access through web-based attacks and privilege escalation through code execution. The chained nature of the exploit, as demonstrated in the Pwn2Own competition, suggests that attackers might have needed to leverage multiple vulnerabilities to achieve full system compromise, a common pattern in advanced persistent threat campaigns. Security professionals should note that this vulnerability exemplifies the importance of defense-in-depth strategies, as relying solely on perimeter security measures would not prevent exploitation of such browser-based vulnerabilities. The incident also reinforces the necessity of regular security assessments, application whitelisting, and user education to reduce the likelihood of successful exploitation. Organizations should have implemented immediate mitigations including browser updates, enhanced security configurations, and network segmentation to protect against potential exploitation attempts. The vulnerability's classification as a remote code execution flaw places it within the high-risk category of security issues that require immediate attention and comprehensive remediation strategies.