CVE-2008-1309 in RealPlayer
Summary
by MITRE
The RealAudioObjects.RealAudio ActiveX control in rmoc3260.dll in RealNetworks RealPlayer Enterprise, RealPlayer 10, RealPlayer 10.5 before build 6.0.12.1675, and RealPlayer 11 before 11.0.3 build 6.0.14.806 does not properly manage memory for the (1) Console or (2) Controls property, which allows remote attackers to execute arbitrary code or cause a denial of service (browser crash) via a series of assignments of long string values, which triggers an overwrite of freed heap memory.
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Analysis
by VulDB Data Team • 06/01/2025
The vulnerability described in CVE-2008-1309 represents a critical memory corruption flaw within the RealAudioObjects.RealAudio ActiveX control component of RealNetworks RealPlayer software. This vulnerability specifically affects multiple versions of RealPlayer Enterprise, RealPlayer 10, RealPlayer 10.5, and RealPlayer 11, creating a persistent security risk across a wide range of software deployments. The flaw manifests in the improper memory management of two distinct properties within the ActiveX control: the Console and Controls properties, which are fundamental components of the media player's object model interface.
The technical implementation of this vulnerability stems from a classic heap-based buffer overflow condition that occurs when the ActiveX control processes long string assignments to the affected properties. When attackers submit carefully crafted sequences of long string values to these properties, the control fails to properly validate or handle the memory allocation required for string processing. This deficiency leads to memory corruption through the overwrite of freed heap memory segments, creating exploitable conditions that can be leveraged by remote attackers to achieve arbitrary code execution or system instability.
From an operational perspective, this vulnerability presents a significant threat to enterprise environments where RealPlayer is deployed, as it enables remote code execution without requiring local system access. The attack vector operates entirely through web-based delivery mechanisms, making it particularly dangerous for organizations with less sophisticated security controls. The vulnerability's impact extends beyond simple exploitation to include potential denial of service conditions, where browser crashes can disrupt normal business operations and user productivity. This weakness directly aligns with CWE-122, which describes heap-based buffer overflow conditions, and represents a prime example of how ActiveX controls can become attack vectors when proper memory management practices are not implemented.
The exploitation of this vulnerability demonstrates the persistent challenges associated with legacy software components and their continued deployment in enterprise environments despite known security weaknesses. Organizations that have not updated their RealPlayer installations to patched versions remain exposed to this risk, as the vulnerability affects multiple generations of the software platform. The attack scenario typically involves crafting malicious web content that triggers the vulnerable ActiveX control when executed in Internet Explorer, leveraging the browser's ActiveX support to deliver the exploit payload directly to the target system. This attack pattern aligns with ATT&CK technique T1203, which covers exploitation of remote services, and highlights the ongoing risk posed by unpatched ActiveX components in corporate networks.
Mitigation strategies for this vulnerability require immediate patching of affected RealPlayer installations to versions that address the memory management flaws in the RealAudioObjects.RealAudio ActiveX control. Organizations should implement comprehensive software inventory management to identify all systems running vulnerable versions of RealPlayer and prioritize remediation efforts accordingly. Additional protective measures include browser security hardening through ActiveX control restrictions, network-based filtering to block malicious content delivery, and user education regarding the risks of executing untrusted web content that might trigger such vulnerabilities. The remediation process must also consider the broader implications of ActiveX control usage in enterprise security postures, as this vulnerability exemplifies the inherent risks associated with legacy component support in modern security environments.