CVE-2012-0922 in RealPlayer
Summary
by MITRE
rvrender.dll in RealNetworks RealPlayer 11.x, 14.x, and 15.x before 15.02.71, and RealPlayer SP 1.0 through 1.1.5, allows remote attackers to execute arbitrary code via crafted flags in an RMFF file.
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Analysis
by VulDB Data Team • 11/29/2021
The vulnerability identified as CVE-2012-0922 represents a critical remote code execution flaw within RealNetworks RealPlayer software ecosystem. This vulnerability specifically affects multiple versions of RealPlayer including the 11.x, 14.x, and 15.x series prior to version 15.02.71, as well as RealPlayer SP 1.0 through 1.1.5. The flaw resides in the rvrender.dll component which is responsible for rendering media content within the RealPlayer application. This represents a classic buffer overflow vulnerability that occurs during the processing of RMFF (Real Media Format File) containers, where the application fails to properly validate or sanitize input parameters before processing them.
The technical exploitation of this vulnerability occurs through the manipulation of flags within RMFF files, which are multimedia container formats used by RealNetworks for storing audio and video content. When a maliciously crafted RMFF file is opened by an affected RealPlayer version, the rvrender.dll module processes these specially crafted flags without adequate bounds checking. This allows an attacker to overwrite memory locations and potentially execute arbitrary code with the privileges of the user running RealPlayer. The vulnerability demonstrates characteristics consistent with CWE-121, heap-based buffer overflow, where insufficient validation of user-supplied data leads to memory corruption that can be exploited for code execution.
From an operational perspective, this vulnerability poses significant risk to organizations and individual users who may inadvertently encounter malicious RMFF files through email attachments, web downloads, or compromised websites. The remote nature of the attack means that exploitation can occur without any local interaction from the user beyond opening the malicious file, making it particularly dangerous in enterprise environments where users may not be security-aware. The impact extends beyond simple code execution to potentially allow attackers to install malware, modify system files, or establish persistence mechanisms within the affected systems. This vulnerability aligns with ATT&CK technique T1203, which covers exploitation for execution, and represents a common vector for initial compromise in targeted attacks.
The mitigation strategies for this vulnerability primarily involve immediate software updates and patches provided by RealNetworks, specifically version 15.02.71 and later releases that address the buffer overflow conditions in the rvrender.dll component. Organizations should implement comprehensive patch management procedures to ensure all affected systems receive updates promptly. Additionally, network-level controls such as content filtering and sandboxing of multimedia file downloads can provide additional defense-in-depth measures. Security professionals should also consider disabling RealPlayer in environments where it is not essential, implementing strict email and web content filtering policies, and monitoring for suspicious file downloads or execution patterns that might indicate exploitation attempts. The vulnerability serves as a reminder of the importance of proper input validation and memory management practices in multimedia processing components, which should adhere to secure coding guidelines to prevent similar issues in future implementations.