CVE-2010-5228 in RealPlayer
Summary
by MITRE
Untrusted search path vulnerability in RealPlayer SP 1.1.5 12.0.0.879 allows local users to gain privileges via a Trojan horse rio500.dll file in the current working directory, as demonstrated by a directory that contains a .avi file. NOTE: some of these details are obtained from third party information.
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Analysis
by VulDB Data Team • 02/20/2019
The vulnerability described in CVE-2010-5228 represents a classic untrusted search path issue affecting RealPlayer SP 1.1.5 and 12.0.0.879 versions. This flaw resides in the software's dynamic library loading mechanism, where the application fails to properly validate or sanitize the search path used to locate required DLL files. The vulnerability specifically manifests when the application processes media files, particularly those with the .avi extension, creating an opportunity for privilege escalation through malicious file placement. The issue stems from the application's tendency to load libraries from the current working directory before checking system directories, a behavior that violates secure coding principles and creates a predictable attack vector for local adversaries.
From a technical perspective, this vulnerability operates through a Trojan horse attack pattern where an attacker places a malicious file named rio500.dll in the same directory as a targeted .avi file. When RealPlayer processes this media file, it attempts to load the required runtime libraries from the current working directory, inadvertently executing the attacker-controlled malicious DLL instead of the legitimate system library. This behavior directly maps to CWE-426 Untrusted Search Path, which specifically addresses the risk of executing malicious code when applications search for libraries in insecure locations. The vulnerability's exploitation requires local access and leverages the principle of least privilege violation, where the application's trust in its working directory compromises system integrity.
The operational impact of this vulnerability extends beyond simple privilege escalation to potentially enable full system compromise when combined with other attack vectors. Local attackers can exploit this weakness to execute arbitrary code with the privileges of the user running RealPlayer, which may include administrative rights in certain configurations. The attack is particularly concerning because it requires minimal user interaction beyond placing the malicious file in a directory containing media files, making it suitable for automated exploitation. This vulnerability also aligns with ATT&CK technique T1068, which covers local privilege escalation through the exploitation of software vulnerabilities, and T1547.001, covering registry run keys and startup folder modifications that may be used in conjunction with such exploits.
Mitigation strategies for CVE-2010-5228 should focus on both immediate remediation and long-term architectural improvements. The most effective immediate solution involves applying the vendor-provided security patches that address the untrusted search path implementation in RealPlayer. Organizations should also implement application whitelisting policies that restrict which DLLs can be loaded by media players and other applications. Additionally, system administrators should consider implementing least privilege principles by running media players with reduced privileges and ensuring that the current working directory is not included in the library search path. The vulnerability highlights the importance of secure coding practices, particularly the need to avoid loading libraries from untrusted or user-controllable paths, and represents a clear example of why applications should implement proper library loading security measures such as explicit path resolution and DLL verification mechanisms.