CVE-2024-45873 in Yaazhini
Summary
by MITRE • 10/08/2024
A DLL hijacking vulnerability in VegaBird Yaazhini 2.0.2 allows attackers to execute arbitrary code / maintain persistence via placing a crafted DLL file in the same directory as Yaazhini.exe.
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Analysis
by VulDB Data Team • 10/11/2024
This vulnerability represents a critical DLL hijacking flaw in VegaBird Yaazhini version 2.0.2 that enables remote code execution and persistent access through malicious dynamic link library manipulation. The issue stems from the application's insecure dynamic link library loading mechanism where it fails to properly validate or specify the exact location of required DLL files during runtime execution. When Yaazhini.exe executes, it searches for dependent DLLs in a predictable order including the current working directory, which creates an exploitable attack surface where malicious actors can place crafted DLL files alongside the legitimate executable.
The technical implementation of this vulnerability aligns with CWE-426, which describes the insecure loading of dynamic link libraries through the use of unquoted paths or insecure search paths. Attackers can exploit this by creating a malicious DLL file named identically to a legitimate dependency that the application expects, placing it in the same directory as Yaazhini.exe, and then executing the application to trigger the loading of the malicious component. This technique leverages the principle of least privilege violations and represents a classic attack pattern documented in the MITRE ATT&CK framework under T1547.001 for registry run keys and T1059 for command and scripting interpreter usage. The vulnerability specifically targets the application's loading behavior where it does not enforce strict DLL path validation or use secure loading mechanisms.
The operational impact of this vulnerability extends beyond simple code execution to include persistent backdoor establishment and long-term system compromise. Once an attacker successfully places a malicious DLL in the application directory, they can maintain access even after system reboots, as the compromised application will continue to load the malicious component each time it executes. This creates a stealthy persistence mechanism that can evade traditional security monitoring tools since the malicious activity appears to originate from a legitimate application. The vulnerability affects any system running VegaBird Yaazhini 2.0.2 where the application has write permissions to its installation directory, potentially allowing attackers to escalate privileges and move laterally within network environments.
Mitigation strategies should focus on implementing proper DLL loading security practices including the use of absolute paths for all dynamic link libraries, enabling Windows DEP and ASLR protections, and restricting write permissions to application directories. System administrators should enforce application whitelisting policies and implement strict directory permissions to prevent unauthorized DLL placement. Additionally, the application should be updated to use LoadLibraryEx with the LOAD_WITH_ALTERED_SEARCH_PATH flag or similar secure loading mechanisms to prevent loading DLLs from unexpected locations. Organizations should also monitor for suspicious file creation patterns in application directories and implement endpoint detection and response solutions that can identify anomalous DLL loading behaviors. The vulnerability highlights the importance of following secure coding practices as outlined in the OWASP Secure Coding Practices and represents a fundamental security flaw that requires both immediate patching and long-term architectural improvements to prevent similar issues in future software releases.