CVE-2010-4378 in RealPlayer
Summary
by MITRE
The drv2.dll (aka RV20 decompression) module in RealNetworks RealPlayer 11.0 through 11.1, RealPlayer SP 1.0 through 1.1.5, RealPlayer Enterprise 2.1.2 and 2.1.3, Linux RealPlayer 11.0.2.1744, and possibly HelixPlayer 1.0.6 and other versions, allows remote attackers to execute arbitrary code or cause a denial of service (heap memory corruption) via a crafted value of an unspecified length field in an RV20 video stream.
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Analysis
by VulDB Data Team • 10/06/2021
The vulnerability identified as CVE-2010-4378 represents a critical heap-based buffer overflow in the drv2.dll module of RealNetworks RealPlayer software ecosystem. This flaw exists within the RV20 decompression functionality that processes video streams, making it a prime target for remote code execution attacks. The vulnerability affects multiple versions of RealPlayer including desktop and enterprise editions across different platforms, as well as the HelixPlayer reference implementation, indicating a widespread exposure across the RealNetworks product portfolio. The issue stems from inadequate input validation within the video stream parsing logic where an unspecified length field in RV20 format streams is not properly constrained, allowing attackers to manipulate memory allocation parameters.
The technical exploitation of this vulnerability occurs through manipulation of the length field within RV20 video streams, which directly influences heap memory allocation decisions during video decompression. When the affected RealPlayer components process a crafted video stream with maliciously constructed length values, the software allocates insufficient heap memory for the decompression process, leading to memory corruption. This heap corruption can result in arbitrary code execution when the corrupted memory is subsequently accessed or overwritten, or alternatively cause a denial of service through application crashes. The vulnerability's classification as a heap-based buffer overflow aligns with CWE-121, which specifically addresses stack-based and heap-based buffer overflow conditions that can lead to arbitrary code execution. The attack vector is particularly dangerous as it requires no user interaction beyond viewing the malicious content, making it a classic remote code execution vulnerability that can be delivered through web browsing or media playback scenarios.
From an operational impact perspective, this vulnerability presents a significant risk to organizations utilizing RealPlayer software, particularly in enterprise environments where the software may be deployed across multiple endpoints. The potential for remote code execution means that attackers could gain complete system control, establish persistent backdoors, or escalate privileges to administrative levels. The vulnerability's exploitation can lead to complete system compromise, data exfiltration, and lateral movement within network environments. Organizations may face regulatory compliance issues and security breaches if exploited successfully, as the vulnerability allows attackers to bypass traditional security controls through legitimate media playback functionality. The widespread deployment of affected RealPlayer versions across different platforms and operating systems amplifies the potential impact, as defenders must address the vulnerability across multiple software variants and deployment scenarios.
Mitigation strategies for CVE-2010-4378 should prioritize immediate software updates from RealNetworks, as the vendor has released patches addressing the heap corruption issue. Organizations should implement network segmentation and access controls to limit exposure, particularly by blocking access to potentially malicious media content through firewalls and proxy servers. Security teams should deploy intrusion detection systems with signatures for detecting exploitation attempts and monitor for unusual network traffic patterns associated with media stream processing. The implementation of application whitelisting policies can prevent unauthorized execution of vulnerable RealPlayer components, while regular security assessments should verify that all affected systems have been properly patched. Additionally, organizations should consider disabling RealPlayer functionality in environments where it is not essential, and implement user education programs to avoid downloading or playing untrusted media content. The vulnerability's characteristics align with ATT&CK technique T1059.007 for command and scripting interpreter, as successful exploitation could enable attackers to execute arbitrary commands through the compromised RealPlayer process, making comprehensive endpoint protection and monitoring essential for defense in depth strategies.