CVE-2010-3633 in Flash Media Server
Summary
by MITRE
Memory leak in Adobe Flash Media Server (FMS) 3.0.x before 3.0.7, 3.5.x before 3.5.5, and 4.0.x before 4.0.1 allows attackers to cause a denial of service (memory consumption) via unspecified vectors.
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Analysis
by VulDB Data Team • 09/29/2021
Adobe Flash Media Server versions 3.0.x prior to 3.0.7, 3.5.x prior to 3.5.5, and 4.0.x prior to 4.0.1 contain a memory leak vulnerability that enables remote attackers to consume excessive system resources and potentially cause denial of service conditions. This vulnerability resides in the server's handling of certain media streaming protocols and connection management mechanisms. The memory leak occurs when the server processes specific malformed or crafted media requests that trigger improper memory allocation and deallocation sequences. Attackers can exploit this weakness by sending carefully constructed media streaming requests that cause the server to continuously allocate memory without properly releasing it, leading to progressive memory consumption over time. The flaw affects the core media processing components of Flash Media Server, particularly those responsible for handling real-time media streaming and connection lifecycle management. This vulnerability is classified as a memory leak under the CWE-401 category, which specifically addresses improper release of memory resources. The operational impact of this vulnerability extends beyond simple resource exhaustion, as it can lead to complete service unavailability and system instability. When the server's memory consumption reaches critical levels, it may cause the application to crash or become unresponsive, effectively denying legitimate users access to streaming services. The attack vector is particularly concerning because it requires minimal privileges and can be executed remotely, making it suitable for automated exploitation. According to ATT&CK framework, this vulnerability maps to T1499.004 which covers "Network Denial of Service" techniques, and T1583.001 which involves "Preparation: Account Access" through resource exhaustion attacks. The vulnerability affects organizations relying on Flash Media Server for content delivery, live streaming, and media processing services, where uninterrupted operation is critical. Organizations using affected versions should immediately implement the vendor-provided patches to address the memory leak issue and prevent potential service disruption.
The memory leak manifests in the server's handling of media streaming connections where the application fails to properly reclaim allocated memory blocks after processing certain request types. This issue is particularly problematic in high-traffic environments where multiple concurrent connections are established, as the memory consumption grows exponentially with each malicious request. The vulnerability does not require authentication or specialized knowledge to exploit, making it accessible to a broad range of threat actors. Security researchers have identified that the flaw is present in the server's media processing pipeline, specifically in how it manages memory for connection state information and media buffer allocations. The improper memory management occurs during the handling of specific RTMP (Real-Time Messaging Protocol) requests that are commonly used for streaming media content. When exploited, this vulnerability can cause the server to consume all available memory within a short time period, leading to complete system failure. The impact is particularly severe in enterprise environments where Flash Media Server is used for critical content delivery services, as the denial of service can affect thousands of users simultaneously. Organizations should implement monitoring solutions to detect unusual memory consumption patterns and establish automated alerting mechanisms to identify potential exploitation attempts. The vulnerability represents a significant risk to organizations that depend on Flash Media Server for their media streaming infrastructure, as it can be leveraged to disrupt business operations and compromise service availability. The remediation process requires careful coordination to ensure that patch deployment does not disrupt ongoing streaming services, and organizations should conduct thorough testing in staging environments before applying updates to production systems.
The technical nature of this vulnerability aligns with the broader category of memory management flaws that have historically affected media streaming and content delivery systems. The flaw demonstrates how improper resource handling in server applications can create significant security risks, particularly when these applications are exposed to untrusted network traffic. From a security posture perspective, this vulnerability highlights the importance of proper memory management practices and regular security assessments of media server implementations. The attack surface for this vulnerability is broad, as it affects any system running the vulnerable versions of Flash Media Server and exposed to internet traffic. Organizations should consider implementing network segmentation and access controls to limit exposure to this vulnerability, while also ensuring that all systems are regularly updated with the latest security patches. The vulnerability's classification under CWE-401 emphasizes the critical nature of proper memory deallocation practices in server applications, where failure to release resources can lead to system instability and denial of service conditions. Security teams should incorporate this vulnerability into their threat modeling exercises and ensure that appropriate controls are in place to detect and prevent exploitation attempts. The remediation process involves not only applying the vendor patches but also conducting comprehensive security reviews of the media server configuration and access controls to prevent similar issues from occurring in the future. This vulnerability serves as a reminder of the importance of maintaining up-to-date security measures and proper resource management practices in enterprise media infrastructure deployments.