CVE-2011-4260 in RealPlayer
Summary
by MITRE
RealNetworks RealPlayer before 15.0.0 allows remote attackers to execute arbitrary code via a malformed header in an MP4 file.
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Analysis
by VulDB Data Team • 11/26/2021
The vulnerability identified as CVE-2011-4260 represents a critical buffer overflow flaw in RealNetworks RealPlayer software versions prior to 15.0.0. This security weakness resides in the media player's handling of MP4 file headers, specifically when parsing malformed header data. The vulnerability falls under the Common Weakness Enumeration category CWE-125, which describes out-of-bounds read conditions that can lead to arbitrary code execution. Attackers can exploit this flaw by crafting specially malformed MP4 files containing maliciously constructed header information that triggers the buffer overflow during playback initialization.
The technical implementation of this vulnerability occurs when RealPlayer attempts to parse MP4 file headers without adequate bounds checking or input validation. When the software encounters a malformed header structure, it fails to properly validate the size parameters or data lengths contained within the header fields. This inadequate validation allows an attacker to overflow buffers allocated for header parsing, potentially overwriting adjacent memory regions including return addresses or function pointers. The flaw specifically affects the MP4 container format parsing logic, where the player's media decoder does not properly sanitize header values before processing them, creating an opportunity for stack-based buffer overflow conditions.
Operationally, this vulnerability presents a significant risk to users who may inadvertently encounter malicious MP4 files through various attack vectors including email attachments, compromised websites, or peer-to-peer file sharing networks. The remote execution aspect means attackers can deliver payloads without requiring local access to the target system, making it particularly dangerous for widespread exploitation. Successful exploitation can result in complete system compromise, allowing attackers to execute arbitrary code with the privileges of the user running RealPlayer. This vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter, as attackers can leverage the code execution capability to establish persistent access or escalate privileges within the compromised environment.
The impact of this vulnerability extends beyond simple code execution, as it represents a classic example of how multimedia applications can become attack vectors for sophisticated cyber operations. The widespread adoption of RealPlayer across various platforms made this vulnerability particularly dangerous, as it could affect users running different operating systems including windows, macos, and linux distributions. Organizations should consider implementing network-based intrusion detection systems to monitor for suspicious MP4 file transfers and ensure that all media player software remains updated with the latest security patches. The vulnerability also highlights the importance of input validation in multimedia processing applications, as similar flaws have been identified in other media players and codecs, emphasizing the need for robust security practices in media handling components.
Mitigation strategies for CVE-2011-4260 include immediate patching of RealPlayer installations to version 15.0.0 or later, which contains the necessary fixes for the buffer overflow conditions. Network administrators should implement strict file type filtering and scanning for MP4 files, particularly when they originate from untrusted sources. Additionally, users should disable automatic playback of media files from unknown origins and consider using alternative media players that have demonstrated better security track records. The vulnerability serves as a reminder of the critical importance of keeping multimedia applications updated and implementing defense-in-depth strategies that include both network monitoring and endpoint security controls to prevent exploitation of similar buffer overflow vulnerabilities in other media processing components.