CVE-2006-6026 in Helix DNA Server
Summary
by MITRE
Heap-based buffer overflow in Real Networks Helix Server and Helix Mobile Server before 11.1.3, and Helix DNA Server 11.0 and 11.1, allows remote attackers to cause a denial of service (application crash) or execute arbitrary code via a DESCRIBE request that contains an invalid LoadTestPassword field.
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Analysis
by VulDB Data Team • 04/28/2026
The vulnerability identified as CVE-2006-6026 represents a critical heap-based buffer overflow affecting Real Networks Helix Server and Helix Mobile Server versions prior to 11.1.3, as well as Helix DNA Server versions 11.0 and 11.1. This flaw resides within the handling of RTSP (Real Time Streaming Protocol) DESCRIBE requests, specifically when processing the LoadTestPassword field. The vulnerability operates through a classic buffer overflow mechanism where insufficient input validation allows attackers to write beyond allocated memory boundaries in the heap allocation region. Such buffer overflows are classified under CWE-121 as heap-based buffer overflow conditions, where the program fails to properly check the length of input data before copying it into fixed-size buffers. The attack vector requires remote execution capability since the vulnerability is triggered through network-based RTSP protocol interactions, making it particularly dangerous for publicly accessible streaming servers.
The technical exploitation of this vulnerability occurs when a malicious actor sends a specially crafted DESCRIBE request containing an invalid LoadTestPassword field that exceeds the allocated buffer size. The server processes this malformed input without proper bounds checking, leading to memory corruption that can result in either application crash or arbitrary code execution. The heap corruption typically manifests through memory overwrite operations that can modify critical program variables, function pointers, or control structures, potentially allowing attackers to redirect execution flow. This vulnerability directly maps to ATT&CK technique T1203 by enabling privilege escalation through code injection, and T1499 by providing denial of service capabilities that can disrupt legitimate service availability.
The operational impact of CVE-2006-6026 extends beyond simple service disruption to encompass potential system compromise and unauthorized access to streaming services. Organizations running affected Real Networks servers face significant risk of unauthorized code execution, which could lead to complete system compromise and data breaches. The vulnerability affects streaming media servers that are often deployed in enterprise environments, making it particularly concerning for organizations with extensive media distribution infrastructures. The remote nature of the attack means that adversaries can exploit this vulnerability from anywhere on the network without requiring physical access or local credentials, significantly expanding the attack surface. Additionally, the vulnerability affects multiple server variants within the Helix product line, increasing the potential impact scope.
Mitigation strategies for CVE-2006-6026 primarily involve immediate patching of affected systems to version 11.1.3 or later, which includes proper bounds checking for the LoadTestPassword field. Network segmentation and firewall rules should be implemented to restrict RTSP protocol access to trusted networks only, limiting the attack surface. Input validation should be enhanced at all protocol levels to prevent malformed requests from reaching vulnerable components. Security monitoring should be implemented to detect unusual RTSP traffic patterns that might indicate exploitation attempts. Organizations should also consider disabling unnecessary RTSP features and implementing intrusion detection systems to identify potential exploitation attempts. The vulnerability highlights the importance of proper memory management practices and input validation in network services, particularly those handling streaming media protocols where buffer overflows can lead to critical system compromise.