CVE-2015-8272 in RTMPDump
Summary
by MITRE
RTMPDump 2.4 allows remote attackers to trigger a denial of service (NULL pointer dereference and process crash).
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Analysis
by VulDB Data Team • 08/30/2020
CVE-2015-8272 represents a critical denial of service vulnerability affecting RTMPDump version 2.4, a widely used open source library for handling real-time messaging protocol streams. This vulnerability manifests as a NULL pointer dereference that occurs when the application processes malformed RTMP packets, specifically during the handling of certain stream metadata structures. The flaw exists in the rtmpdump utility's packet parsing logic where it fails to properly validate incoming data before attempting to dereference pointers, creating an exploitable condition that can be triggered remotely by sending specially crafted RTMP stream data to the vulnerable application.
The technical implementation of this vulnerability stems from inadequate input validation within the RTMP protocol parsing routines, particularly in how the application handles stream initialization and metadata processing. When RTMPDump encounters malformed stream headers or unexpected data sequences, the parsing function attempts to access memory locations through NULL pointers without proper null checks, resulting in immediate process termination. This behavior aligns with CWE-476 which specifically addresses NULL pointer dereference vulnerabilities, where a null pointer is dereferenced during program execution, leading to application crashes and denial of service conditions. The vulnerability is classified as a remote attack vector because an attacker can trigger the condition without requiring local system access, making it particularly dangerous in networked environments where RTMP services are exposed.
The operational impact of CVE-2015-8272 extends beyond simple service disruption, as it can be leveraged by malicious actors to create persistent availability issues for streaming services, media servers, and content delivery platforms that rely on RTMPDump for their operations. This vulnerability affects a wide range of applications including media streaming servers, live broadcast platforms, and content management systems that utilize RTMP protocols for real-time data transmission. The remote nature of the exploit means that attackers can target vulnerable systems from anywhere on the internet, potentially causing cascading failures in streaming infrastructures where multiple services depend on RTMP connectivity. From an adversary perspective, this vulnerability maps to ATT&CK technique T1499.004 which involves network denial of service attacks, specifically targeting application availability through process crashes and resource exhaustion.
Mitigation strategies for CVE-2015-8272 require immediate patching of RTMPDump to version 2.5 or later where the NULL pointer dereference has been addressed through proper input validation and pointer checks. Organizations should implement network segmentation to limit exposure of RTMP services to untrusted networks and deploy intrusion detection systems that can identify and alert on malformed RTMP traffic patterns. Additionally, administrators should consider implementing application-level firewalls or proxy services that can filter and sanitize RTMP streams before they reach vulnerable applications. The vulnerability demonstrates the importance of input validation in network protocol implementations and serves as a reminder that even well-established open source libraries can contain critical flaws that require regular security auditing and timely patch management processes. Organizations using RTMP protocols should also conduct thorough vulnerability assessments of their entire streaming infrastructure to identify other potential entry points that may be similarly vulnerable to remote exploitation.