CVE-2010-5221 in STDU Explorer
Summary
by MITRE
Untrusted search path vulnerability in STDU Explorer 1.0.201 allows local users to gain privileges via a Trojan horse dwmapi.dll file in the current working directory. NOTE: some of these details are obtained from third party information.
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Analysis
by VulDB Data Team • 12/13/2021
The vulnerability identified as CVE-2010-5221 represents a critical untrusted search path issue affecting STDU Explorer version 1.0.201, classified under CWE-427 Uncontrolled Search Path Element. This flaw exploits the application's failure to properly validate the source of dynamically loaded libraries, creating a privilege escalation vector through malicious Trojan horse files. The vulnerability specifically targets the dwmapi.dll library which is crucial for Windows Desktop Window Manager functionality, making it an attractive target for attackers seeking elevated system privileges.
The technical implementation of this vulnerability stems from STDU Explorer's insecure library loading mechanism where the application searches for required dynamic link libraries in the current working directory before examining system directories. This behavior violates the principle of least privilege and creates an exploitable condition where a local attacker can place a malicious dwmapi.dll file in the application's execution path. When the application loads this library, it inadvertently executes code from the attacker-controlled file, effectively bypassing standard security controls and gaining elevated privileges.
The operational impact of this vulnerability extends beyond simple privilege escalation, as it provides attackers with the ability to execute arbitrary code with system-level privileges. The attack vector requires local system access but does not necessitate network connectivity, making it particularly dangerous in environments where local access is possible. This vulnerability aligns with ATT&CK technique T1068 Privilege Escalation through the use of insecure library loading mechanisms. The exploitation process typically involves placing a crafted dwmapi.dll file in the application's directory, which then gets loaded during normal application execution, enabling the attacker to execute malicious code with elevated privileges.
Mitigation strategies for this vulnerability should focus on implementing proper library loading practices that prioritize system directories over the current working directory. Organizations should enforce application whitelisting policies and ensure that applications are configured to load libraries only from trusted locations. The fix involves modifying the application's search path to explicitly specify system library locations and avoid searching the current working directory first. Additionally, regular security audits should verify that applications properly implement secure coding practices and do not exhibit the insecure library loading behaviors described in this vulnerability. System administrators should also consider implementing mandatory access controls and monitoring for suspicious file placement activities in application directories.