CVE-2011-4253 in RealPlayer
Summary
by MITRE
Unspecified vulnerability in the RV20 codec in RealNetworks RealPlayer before 15.0.0 and Mac RealPlayer before 12.0.0.1703 allows remote attackers to execute arbitrary code via unknown vectors.
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Analysis
by VulDB Data Team • 11/26/2021
The vulnerability identified as CVE-2011-4253 represents a critical security flaw within the RV20 codec implementation found in RealNetworks RealPlayer software across both Windows and Mac platforms. This vulnerability exists in versions prior to 15.0.0 for Windows and 12.0.0.1703 for Mac operating systems, indicating a significant window of exposure where users were susceptible to remote code execution attacks. The unspecified nature of the vulnerability vectors suggests that the underlying flaw could be exploited through multiple attack pathways, making it particularly dangerous for security professionals to assess and mitigate.
The technical flaw resides within the RV20 codec's handling of multimedia data streams, where insufficient input validation and memory management controls allow maliciously crafted media files to trigger buffer overflows or other memory corruption conditions. This type of vulnerability typically falls under the CWE-119 category of "Improper Restriction of Operations within the Bounds of a Memory Buffer" and may also align with CWE-787 "Out-of-bounds Write" depending on the specific exploitation mechanism. The codec's failure to properly validate input parameters during media parsing creates opportunities for attackers to inject malicious code that executes with the privileges of the affected application, potentially leading to complete system compromise.
From an operational perspective, this vulnerability presents severe risks to organizations and individual users who may unknowingly encounter malicious media content through email attachments, web downloads, or streaming services. The remote execution capability means that attackers can exploit this vulnerability without requiring physical access to the target system, making it particularly dangerous in enterprise environments where users frequently interact with untrusted content. The attack surface expands significantly when considering that RealPlayer was widely used for multimedia playback across various platforms, increasing the potential impact of successful exploitation. Security analysts should note that this vulnerability aligns with ATT&CK technique T1203 "Exploitation for Client Execution" and may also involve T1059 "Command and Scripting Interpreter" as attackers could leverage the executed code for further system compromise.
Mitigation strategies for CVE-2011-4253 primarily focus on immediate software updates and patches provided by RealNetworks, which address the underlying codec implementation flaws. Organizations should implement comprehensive patch management procedures to ensure all affected RealPlayer installations are updated promptly. Additional protective measures include network segmentation to limit media content access, deployment of network-based intrusion detection systems to monitor for suspicious media file transfers, and user education regarding the dangers of opening untrusted multimedia content. Security teams should also consider implementing application whitelisting policies that restrict execution of RealPlayer unless explicitly authorized, and conduct regular vulnerability assessments to identify other potentially affected components within their multimedia handling infrastructure. The remediation process should include thorough testing of patches in controlled environments before widespread deployment to ensure compatibility with existing systems and applications.