CVE-2016-4176 in Flash Player
Summary
by MITRE • 01/25/2023
Adobe Flash Player before 18.0.0.366 and 19.x through 22.x before 22.0.0.209 on Windows and OS X and before 11.2.202.632 on Linux allows attackers to execute arbitrary code or cause a denial of service (stack memory corruption) via unspecified vectors, a different vulnerability than CVE-2016-4177.
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Analysis
by VulDB Data Team • 12/23/2024
Adobe Flash Player versions prior to 18.0.0.366 and 19.x through 22.x before 22.0.0.209 on Windows and OS X platforms, as well as versions before 11.2.202.632 on Linux systems, contained a critical stack memory corruption vulnerability that enabled remote code execution and denial of service attacks. This vulnerability represents a classic stack-based buffer overflow condition that occurs when the Flash Player processes malformed input data, specifically within its handling of multimedia content and scripting elements. The flaw stems from improper bounds checking during memory allocation and data processing operations, creating opportunities for attackers to overwrite adjacent stack memory locations with malicious code sequences. This vulnerability operates at the kernel level of memory management within the Flash runtime environment, making it particularly dangerous as it can be exploited through web browsers or any application that embeds Flash content. The attack vector typically involves delivering malicious Flash content through compromised websites or email attachments, where the vulnerable Flash Player component executes the crafted payload in the context of the user's session. The memory corruption affects the stack pointer and return addresses, potentially allowing attackers to redirect execution flow to arbitrary code locations, effectively granting them full control over the affected system. This vulnerability aligns with CWE-121 Stack-based Buffer Overflow, which specifically addresses buffer overflows that occur in stack memory regions. The attack pattern follows common MITRE ATT&CK techniques related to privilege escalation and code execution through exploitation of software vulnerabilities. Organizations running affected Flash Player versions face significant risk as the vulnerability can be leveraged for persistent backdoor installations, data exfiltration, and system compromise without user interaction. The impact extends beyond immediate exploitation to include long-term persistence mechanisms that can evade traditional security controls. This vulnerability demonstrates the inherent risks of legacy multimedia frameworks and the importance of maintaining up-to-date software components in enterprise environments. The flaw underscores the critical need for comprehensive patch management programs and the dangers of continued reliance on deprecated software platforms that no longer receive security updates.
The technical implementation of this vulnerability involves the exploitation of memory management flaws within Flash Player's ActionScript interpreter and multimedia processing engines. Attackers can craft malicious SWF files or embed malicious content within web pages that trigger the vulnerable code paths when processed by the affected Flash Player versions. The memory corruption occurs during normal operation of the Flash runtime when it encounters malformed data structures or improperly formatted multimedia elements. The stack memory corruption manifests as overwrites to return addresses, saved registers, and local variables, which can be manipulated to redirect program execution. This type of vulnerability is particularly insidious because it can be triggered through legitimate web browsing activities, making it difficult to detect and prevent through traditional network monitoring approaches. The exploitation process typically involves precise control over memory layout and careful crafting of input data to ensure successful overwrite of critical execution pointers. Security researchers identified that the vulnerability affects multiple Flash Player versions across different operating systems, indicating a widespread impact that required coordinated patching efforts. The vulnerability's classification as a stack-based buffer overflow aligns with established security frameworks that categorize such flaws based on their memory access patterns and exploitation mechanisms. Organizations must understand that this vulnerability represents a fundamental weakness in the Flash Player's memory management architecture that could be leveraged for advanced persistent threats and zero-day exploitation campaigns.
Mitigation strategies for this vulnerability require immediate patch deployment across all affected systems, as the flaw provides attackers with direct paths to system compromise. Organizations should implement comprehensive software inventory management to identify all instances of vulnerable Flash Player versions across their networks and ensure timely patch installation. The recommended approach includes disabling Flash Player in web browsers where possible and implementing network-based controls to block Flash content delivery. Security teams should establish automated patch management processes to prevent recurrence of similar vulnerabilities in other software components. Additional defensive measures include network segmentation to limit the potential impact of successful exploitation, enhanced monitoring for suspicious network traffic patterns, and regular security assessments to identify unpatched systems. The vulnerability highlights the importance of maintaining software lifecycle management practices that include regular security assessments and timely remediation of known vulnerabilities. Organizations should consider transitioning away from Flash-based content and applications to modern web standards that provide better security guarantees and more robust memory management. The incident serves as a critical reminder of the risks associated with legacy software platforms and the necessity of maintaining current security postures through proactive vulnerability management and continuous monitoring. Implementation of these mitigation strategies requires coordination between security operations, IT infrastructure teams, and business stakeholders to ensure comprehensive protection against exploitation attempts.