CVE-2016-4151 in Flash Player
Summary
by MITRE • 01/26/2023
Unspecified vulnerability in Adobe Flash Player 21.0.0.242 and earlier, as used in the Adobe Flash libraries in Microsoft Internet Explorer 10 and 11 and Microsoft Edge, has unknown impact and attack vectors, a different vulnerability than other CVEs listed in MS16-083.
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Analysis
by VulDB Data Team • 10/05/2024
Adobe Flash Player version 21.0.0.242 and earlier contains an unspecified vulnerability that affects Microsoft Internet Explorer 10 and 11 as well as Microsoft Edge browsers through their embedded Flash libraries. This vulnerability represents a distinct security flaw separate from other issues documented in Microsoft Security Bulletin MS16-083, indicating that it operates through different attack vectors and mechanisms. The unspecified nature of the vulnerability means that the exact technical details regarding how the flaw manifests remain undisclosed, making it particularly concerning for security professionals who must assess risk without complete information about the underlying exploit mechanisms. The vulnerability exists within the Flash Player runtime environment that Microsoft browsers utilize, creating a potential attack surface that could be leveraged by threat actors to execute malicious code or gain unauthorized access to systems. Given that this vulnerability affects widely used browser environments, the potential impact extends across numerous enterprise and consumer endpoints where these older Flash Player versions remain installed. The lack of specific details about the vulnerability's nature makes it challenging to implement targeted defensive measures, as security teams cannot definitively identify the precise exploitation techniques or code execution pathways that attackers might utilize. This type of vulnerability typically falls under the category of memory corruption issues that could potentially allow for arbitrary code execution when malicious Flash content is processed by the affected browsers. The vulnerability's presence in both Internet Explorer 10 and 11 versions indicates it affects legacy browser environments that may not receive regular security updates, creating prolonged exposure windows for organizations that have not migrated to modern browser standards. The distinction from MS16-083 suggests this represents a separate class of flaws within the Flash Player codebase, potentially involving different memory management functions or processing routines that handle multimedia content. Security researchers and organizations must approach this vulnerability with caution, as the unspecified nature often indicates either a critical flaw that has not been fully characterized or a vulnerability that may require specific conditions to be exploited successfully. The impact of such vulnerabilities can range from information disclosure to complete system compromise depending on the underlying technical flaw and the environment in which it operates. This type of vulnerability typically requires immediate remediation through patch updates to the Flash Player runtime, though the effectiveness of such patches depends on proper installation and configuration across all affected systems. The vulnerability's presence in Microsoft Edge further complicates mitigation efforts since Edge also relies on Flash Player libraries for certain multimedia content processing, potentially creating multiple attack vectors for threat actors. Organizations should consider implementing network-based controls such as content filtering and browser security policies to limit exposure while waiting for official patches, as the unspecified nature of the vulnerability makes it difficult to predict specific exploitation patterns or defensive strategies.
The technical nature of this vulnerability aligns with common Flash Player security issues that have historically involved memory corruption, buffer overflows, or improper input validation within multimedia processing functions. These types of flaws often result from the complex nature of Flash content parsing and execution, where malformed or malicious SWF files can trigger unexpected behavior in the player's runtime environment. The vulnerability's impact assessment becomes more challenging when specific details are not disclosed, as it prevents security teams from conducting thorough risk analysis or implementing precise defensive measures. The fact that this vulnerability exists in multiple browser environments including legacy Internet Explorer versions indicates that it represents a fundamental flaw in the Flash Player implementation rather than a browser-specific issue. Such vulnerabilities often require complete removal or disabling of Flash Player functionality since patching may not be feasible for older versions, particularly in enterprise environments where legacy applications depend on Flash content. The unspecified nature of the vulnerability also suggests that it may be related to privilege escalation or code execution mechanisms that could allow attackers to bypass security restrictions within the browser environment. From a cybersecurity perspective, this vulnerability exemplifies why organizations should move away from Flash-based content and adopt modern web standards that provide better security guarantees. The vulnerability's classification under the broader category of memory corruption flaws aligns with common attack patterns documented in the attack framework, where memory-related issues form the foundation for many exploitation techniques. Security professionals should consider this vulnerability in their risk assessments alongside other known Flash Player vulnerabilities and ensure comprehensive patch management strategies are in place across all affected systems. The presence of this vulnerability in Microsoft Edge highlights the interconnected nature of modern browser security, where components from different software vendors can create complex attack surfaces that require coordinated remediation efforts. Organizations should also consider implementing browser sandboxing and content security policies to limit the potential impact of such unspecified vulnerabilities, particularly in environments where Flash content remains necessary for legacy applications. The vulnerability's unspecified nature also indicates that it may be actively exploited in the wild, making immediate remediation essential for organizations that have not yet updated their Flash Player installations.
Mitigation strategies for this unspecified vulnerability must address the fundamental challenge of operating without complete technical details about the flaw's exploitation mechanisms. Organizations should prioritize immediate patching of Flash Player installations to the latest available versions, as this represents the most effective defense against known and unknown exploitation techniques. The vulnerability's presence in both Internet Explorer 10 and 11 environments suggests that organizations should consider implementing browser compatibility policies that mandate upgrade to newer browser versions that either do not rely on Flash Player or have better security controls. Security teams should implement network-based controls such as content filtering and web application firewalls to prevent execution of potentially malicious Flash content, particularly in enterprise environments where legacy applications may still require Flash functionality. The vulnerability's classification as a distinct issue from MS16-083 indicates that organizations should not assume that patches addressing one vulnerability will resolve this specific flaw, requiring separate remediation efforts. Organizations should also consider implementing browser security policies that disable Flash Player functionality entirely, particularly for users who do not require Flash content for legitimate business purposes. The unspecified nature of the vulnerability makes it particularly dangerous because it may be actively exploited, necessitating immediate action rather than delayed remediation. Security professionals should monitor threat intelligence feeds for any information about exploitation attempts targeting this specific vulnerability, as the lack of technical details does not preclude active exploitation in targeted attacks. The vulnerability's presence in Microsoft Edge further emphasizes the need for comprehensive browser security strategies that account for all components within the browser ecosystem. Organizations should also consider implementing endpoint detection and response solutions that can identify anomalous behavior indicative of exploitation attempts, as traditional signature-based detection may not be effective against unspecified vulnerabilities. The remediation approach for this vulnerability should include not only patching but also user education about the risks associated with Flash content and the importance of maintaining up-to-date security software. Given the potential for privilege escalation or code execution through this unspecified vulnerability, organizations should ensure that Flash Player functionality is restricted to the minimum necessary access levels and that appropriate monitoring is implemented to detect any unauthorized Flash content execution. The vulnerability's impact extends beyond individual system compromise to potential enterprise-wide security breaches, making comprehensive remediation and monitoring strategies essential for effective risk management.