CVE-2011-4255 in RealPlayer
Summary
by MITRE
Unspecified vulnerability in RealNetworks RealPlayer before 15.0.0 and Mac RealPlayer before 12.0.0.1703 allows remote attackers to execute arbitrary code via an invalid codec name.
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Analysis
by VulDB Data Team • 11/26/2021
The vulnerability identified as CVE-2011-4255 represents a critical security flaw in RealNetworks RealPlayer software across both Windows and Mac platforms. This unspecified vulnerability exists in versions prior to 15.0.0 for Windows and 12.0.0.1703 for Mac systems, indicating a significant window of exposure for users who failed to update their installations. The flaw specifically manifests when the media player encounters an invalid codec name during playback operations, creating a potential attack vector for remote code execution. This type of vulnerability falls under the category of buffer overflow conditions and memory corruption issues that are commonly classified under CWE-121, which deals with stack-based buffer overflow conditions.
The technical exploitation of this vulnerability occurs through the improper handling of codec names within the RealPlayer media processing pipeline. When a malicious actor crafts a specially formatted media file containing an invalid or malformed codec name, the player's parsing mechanism fails to properly validate input data before attempting to process it. This failure creates an opportunity for attackers to inject malicious code that executes with the privileges of the running RealPlayer process. The attack typically requires the user to either open a malicious file or visit a compromised website that automatically attempts to play such media content. This remote code execution capability places the vulnerability squarely within the ATT&CK framework under the T1059.007 technique for Command and Scripting Interpreter, as well as T1203 for Exploitation for Client Execution, demonstrating how the flaw can be leveraged for full system compromise.
The operational impact of CVE-2011-4255 extends beyond simple code execution, as successful exploitation can lead to complete system compromise and persistent access for attackers. The vulnerability affects a widely deployed media player application that was commonly used across enterprise and consumer environments, amplifying the potential damage. Organizations running older versions of RealPlayer were particularly vulnerable since the software was often installed by default on many systems, and users rarely updated it manually. The lack of proper input validation in the codec name handling mechanism means that attackers could potentially bypass standard security measures such as firewalls and antivirus software, as the malicious code would execute within the legitimate application context. This vulnerability also demonstrates the broader issue of legacy software support where vendors may stop providing updates for older versions, leaving users exposed to known exploits.
Mitigation strategies for CVE-2011-4255 primarily focus on immediate remediation through software updates and comprehensive system hardening. Organizations should prioritize updating all RealPlayer installations to versions 15.0.0 or later for Windows and 12.0.0.1703 or later for Mac systems, as these releases contain the necessary patches to address the codec name validation issue. Additionally, network administrators should implement strict media file filtering policies that prevent automatic playback of untrusted media content, particularly in enterprise environments where users may encounter malicious files through email attachments or web browsing. Security teams should also consider implementing application whitelisting policies that restrict the execution of unauthorized media players or plugins. The vulnerability highlights the importance of maintaining current software versions and demonstrates how legacy applications can pose significant security risks when not properly maintained. Organizations should establish robust patch management processes to ensure timely updates of all media applications and plugins, as well as conduct regular vulnerability assessments to identify and remediate similar issues in other software components. The incident serves as a critical reminder of the need for continuous security monitoring and proactive vulnerability management to prevent exploitation of known security flaws in widely used software applications.