CVE-2009-0376 in RealPlayer
Summary
by MITRE
Heap-based buffer overflow in a DLL file in RealNetworks RealPlayer 10, RealPlayer 10.5 6.0.12.1040 through 6.0.12.1741, RealPlayer 11 11.0.0 through 11.0.4, RealPlayer Enterprise, Mac RealPlayer 10 and 10.1, Linux RealPlayer 10, and Helix Player 10.x allows remote attackers to execute arbitrary code via a crafted Internet Video Recording (IVR) file with a modified field that controls an unspecified structure length and triggers heap corruption, related to use of RealPlayer through a Windows Explorer plugin.
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Analysis
by VulDB Data Team • 08/27/2019
The vulnerability described in CVE-2009-0376 represents a critical heap-based buffer overflow affecting multiple versions of RealNetworks RealPlayer software across various platforms including Windows, Mac, and Linux operating systems. This security flaw exists within a dynamic link library component that processes Internet Video Recording (IVR) files, making it particularly dangerous as it can be exploited through normal media playback operations. The vulnerability specifically manifests when the RealPlayer software processes a crafted IVR file that contains a modified field controlling an unspecified structure length, leading to heap corruption during the parsing process. This type of vulnerability falls under the Common Weakness Enumeration category CWE-121, which deals with heap-based buffer overflow conditions where insufficient bounds checking allows attackers to overwrite adjacent heap memory regions.
The technical exploitation of this vulnerability occurs through the Windows Explorer plugin mechanism, which means that simply browsing to a malicious IVR file within Windows Explorer could trigger the exploit without requiring any special user interaction beyond the initial file access. The heap corruption resulting from this buffer overflow creates opportunities for attackers to execute arbitrary code with the privileges of the user running the vulnerable RealPlayer application. This attack vector is particularly concerning because it leverages the widespread use of Windows Explorer plugins and the common practice of automatically playing media files when they are opened or previewed. The vulnerability affects a broad range of RealPlayer versions including RealPlayer 10, 10.5, 11, and the enterprise and Mac versions, indicating that this was a significant flaw that required immediate attention across multiple product lines.
The operational impact of this vulnerability extends beyond simple code execution, as it provides attackers with potential access to sensitive system resources and could enable further exploitation attempts. The heap-based nature of the overflow means that memory corruption could affect critical application structures, potentially leading to application crashes or complete system compromise. Attackers exploiting this vulnerability could gain the ability to install malicious software, modify system files, or establish persistent access to compromised systems. The attack surface is further expanded by the fact that this vulnerability can be triggered through normal file browsing operations, making it particularly dangerous in environments where users frequently access untrusted media content. This vulnerability aligns with ATT&CK technique T1203, which describes exploitation of software vulnerabilities for code execution, and represents a classic example of how media player software can serve as an attack vector for privilege escalation and system compromise.
Mitigation strategies for this vulnerability should focus on immediate software updates and patches provided by RealNetworks, as well as network-level controls to prevent access to potentially malicious IVR files. Organizations should implement strict file type filtering and sandboxing mechanisms for media file handling, particularly in environments where users may encounter untrusted content. System administrators should disable the Windows Explorer plugin functionality for RealPlayer if it is not essential for business operations, as this removes one of the primary attack vectors for this specific vulnerability. Additionally, network monitoring should be enhanced to detect unusual file access patterns that might indicate exploitation attempts, and users should be educated about the risks of opening unknown or untrusted media files. The vulnerability demonstrates the importance of proper input validation and bounds checking in media processing libraries, as well as the necessity of maintaining up-to-date security patches across all software components that handle user-supplied data.