CVE-2022-32291 in RealPlayer
Summary
by MITRE • 06/06/2022
In Real Player through 20.1.0.312, attackers can execute arbitrary code by placing a UNC share pathname (for a DLL file) in a RAM file.
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Analysis
by VulDB Data Team • 06/08/2022
The vulnerability identified as CVE-2022-32291 represents a critical remote code execution flaw within Real Player software versions up to 20.1.0.312. This vulnerability stems from the application's improper handling of Universal Naming Convention (UNC) share pathnames when processing RAM files, which are typically used for streaming media content. The flaw allows attackers to craft malicious RAM files containing UNC paths that point to specially crafted DLL files hosted on remote servers, creating a dangerous attack vector that can be exploited through various delivery mechanisms.
The technical implementation of this vulnerability occurs when Real Player processes a RAM file that contains a UNC path reference to a DLL file located on a remote network share. The application fails to properly validate or sanitize these paths, allowing the system to attempt to load and execute the referenced DLL from the remote location. This behavior violates fundamental security principles of input validation and privilege escalation, as the software executes code from arbitrary network locations without proper authentication or authorization checks. The vulnerability specifically relates to CWE-78 and CWE-74, which address improper neutralization of special elements used in OS command injection and input validation issues respectively.
The operational impact of this vulnerability extends beyond simple code execution, as it enables attackers to perform sophisticated attack chains that can lead to complete system compromise. Once executed, the malicious DLL can establish persistence mechanisms, escalate privileges, or create backdoors within the target system. The attack surface is particularly concerning because RAM files are commonly used in media streaming scenarios and can be delivered through various vectors including email attachments, malicious websites, or compromised media libraries. This vulnerability aligns with ATT&CK technique T1059.007 for command and scripting interpreter, and T1566 for spearphishing attacks, making it a significant threat in enterprise environments where media playback applications are commonly used.
Organizations should implement immediate mitigations including disabling the processing of RAM files from untrusted sources, implementing network segmentation to prevent access to internal UNC shares from external systems, and deploying application control measures that prevent Real Player from accessing remote network resources. Security teams should also consider implementing network monitoring to detect suspicious UNC path access patterns and ensure that all systems running Real Player are patched to the latest available versions. The vulnerability demonstrates the importance of proper input validation in media processing applications and highlights the need for comprehensive security testing of file parsing mechanisms to prevent similar issues in other multimedia software components.