CVE-2011-1525 in RealPlayer
Summary
by MITRE
Heap-based buffer overflow in rvrender.dll in RealNetworks RealPlayer 11.0 through 11.1 and 14.0.0 through 14.0.2, and RealPlayer SP 1.0 through 1.1.5, allows remote attackers to execute arbitrary code via a crafted frame in an Internet Video Recording (IVR) file.
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Analysis
by VulDB Data Team • 12/28/2024
The vulnerability identified as CVE-2011-1525 represents a critical heap-based buffer overflow in the rvrender.dll component of RealNetworks RealPlayer software across multiple versions including 11.0 through 11.1, 14.0.0 through 14.0.2, and RealPlayer SP 1.0 through 1.1.5. This flaw resides within the rendering engine responsible for processing Internet Video Recording format files, making it particularly dangerous as it can be exploited through remote code execution via maliciously crafted media content. The vulnerability is classified under CWE-121 as a heap-based buffer overflow, which occurs when more data is written to a heap-allocated buffer than it can accommodate, leading to memory corruption that attackers can leverage for malicious purposes.
The technical exploitation of this vulnerability involves the manipulation of IVR file structures to trigger memory corruption during the rendering process. When RealPlayer processes a specially crafted IVR file, the rvrender.dll module fails to properly validate buffer boundaries, allowing an attacker to overwrite adjacent memory locations on the heap. This memory corruption can result in arbitrary code execution with the privileges of the victim user, potentially enabling full system compromise. The vulnerability is particularly concerning because it requires no user interaction beyond opening the malicious file, making it a prime target for drive-by download attacks and social engineering campaigns.
From an operational impact perspective, this vulnerability presents significant risks to enterprise environments where RealPlayer remains installed on user systems. The remote exploitation capability means that attackers can compromise systems without physical access or user awareness, creating a persistent threat vector that can be leveraged for data exfiltration, lateral movement, or establishment of persistent backdoors. The vulnerability affects a wide range of RealPlayer versions, indicating that organizations with legacy systems or those that have not updated their media players remain at risk. Security teams must consider this vulnerability as part of their broader threat landscape, particularly in environments where outdated media software persists due to compatibility requirements or administrative oversight.
The mitigation strategies for CVE-2011-1525 primarily focus on immediate software updates and administrative controls. Organizations should prioritize patching all affected RealPlayer installations to the latest versions that contain fixes for this heap overflow vulnerability. Additionally, network administrators should implement content filtering measures to block or quarantine IVR files from untrusted sources, particularly in environments where media playback is not required for business operations. The implementation of application whitelisting policies can further reduce risk by preventing unauthorized media players from executing on systems. From an ATT&CK framework perspective, this vulnerability aligns with techniques such as T1059 for command and scripting interpreter and T1203 for exploitation for privilege escalation, making it a critical component in threat hunting and incident response activities. Regular security assessments should include verification of media player installations and their compliance with security baselines to prevent exploitation of similar vulnerabilities in the future.