CVE-2012-4168 in Flash Player
Summary
by MITRE
Adobe Flash Player before 10.3.183.23 and 11.x before 11.4.402.265 on Windows and Mac OS X, before 10.3.183.23 and 11.x before 11.2.202.238 on Linux, before 11.1.111.16 on Android 2.x and 3.x, and before 11.1.115.17 on Android 4.x; Adobe AIR before 3.4.0.2540; and Adobe AIR SDK before 3.4.0.2540 allow remote attackers to read content from a different domain via a crafted web site.
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Analysis
by VulDB Data Team • 03/27/2021
Adobe Flash Player versions prior to specific patched releases across multiple operating systems and platforms contained a critical cross-site scripting vulnerability that enabled remote attackers to bypass security restrictions and access content from different domains. This vulnerability stemmed from inadequate implementation of the Flash Player's security model, specifically the cross-domain policy enforcement mechanisms that should have prevented unauthorized data access between different web domains. The flaw allowed malicious actors to construct specially crafted web pages that could exploit the broken security boundaries within Flash Player's architecture, enabling them to retrieve sensitive data from other domains that they should not have access to under normal security constraints. The vulnerability was particularly dangerous because it affected multiple platforms including Windows, Mac OS X, Linux, and various Android versions, demonstrating the widespread nature of the security flaw within Adobe's Flash Player implementation. This weakness directly violated fundamental web security principles and could be exploited to perform data theft, session hijacking, or other malicious activities that compromised user privacy and system integrity.
The technical root cause of this vulnerability was a failure in Flash Player's cross-domain policy validation logic, which is typically governed by the cross-domain policy file mechanism defined in web security standards. This flaw aligns with CWE-200, which describes improper information exposure, and specifically relates to the improper enforcement of security boundaries within application frameworks. The vulnerability exploited the fact that Flash Player was not properly validating cross-domain requests, allowing attackers to craft malicious content that could bypass the security restrictions typically enforced by the Flash Player's sandbox model. Attackers could leverage this weakness by hosting malicious content on one domain and using Flash Player's capabilities to access resources from another domain, effectively circumventing the same-origin policy that normally protects web applications from unauthorized cross-domain access. The exploitation required a victim to visit a malicious website that contained Flash content designed to target the vulnerable Flash Player version, making this a client-side attack vector that could be delivered through various means including phishing campaigns, compromised websites, or malicious advertisements.
The operational impact of this vulnerability was significant and far-reaching, as it affected millions of users across different platforms and operating systems, creating a substantial attack surface for cybercriminals. Organizations that relied on Flash Player for web content delivery or interactive applications faced potential data breaches and unauthorized access to sensitive information that could include user credentials, personal data, or corporate information. The vulnerability was particularly concerning because Flash Player was widely deployed across enterprise environments, making it a prime target for advanced persistent threats and targeted attacks. Security researchers noted that the flaw could be exploited in conjunction with other vulnerabilities to create more sophisticated attack scenarios, potentially leading to complete system compromise or data exfiltration. The widespread deployment of vulnerable Flash Player versions meant that organizations needed to urgently implement patches and remediation measures, as the vulnerability could be exploited by attackers with minimal technical expertise. This vulnerability also highlighted the risks associated with legacy software components that continued to be used despite known security issues, emphasizing the importance of maintaining up-to-date security controls and implementing proper software lifecycle management practices.
Mitigation strategies for this vulnerability focused primarily on immediate patching and updating of affected Flash Player installations across all supported platforms. Organizations should have implemented mandatory security updates for all Flash Player versions, particularly those running on Windows, Mac OS X, Linux, and Android systems. The recommended approach included deploying automated patch management solutions to ensure all vulnerable systems received updates promptly, along with implementing network monitoring to detect potential exploitation attempts. Security teams were advised to review and update their security policies to include requirements for regular Flash Player updates, as well as to implement network segmentation and access controls to limit the potential impact of successful exploitation. Additionally, organizations should have considered disabling Flash Player in web browsers where possible, particularly for users who did not require Flash content, and implemented web application firewalls to detect and block malicious Flash content. The incident underscored the importance of maintaining comprehensive software inventory management and vulnerability assessment processes to identify and remediate similar security flaws across the entire technology infrastructure, aligning with industry best practices for vulnerability management and incident response. This vulnerability also served as a catalyst for organizations to accelerate their transition away from Flash-based technologies and toward more secure modern web standards, as it demonstrated the inherent security risks associated with legacy multimedia frameworks.