Untrusted search path vulnerability in the installer for TrueCrypt 7.2 and 7.1a, VeraCrypt before 1.17-BETA, and possibly other products allows local users to execute arbitrary code with administrator privileges and conduct DLL hijacking attacks via a Trojan horse DLL in the application directory, as demonstrated with the USP10.dll, RichEd20.dll, NTMarta.dll and SRClient.dll DLLs.
The application searches for critical resources using an externally-supplied search path that can point to resources that are not under the application’s direct control.
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This might allow attackers to execute their own programs, access unauthorized data files, or modify configuration in unexpected ways. If the application uses a search path to locate critical resources such as programs, then an attacker could modify that search path to point to a malicious program, which the targeted application would then execute. The problem extends to any type of critical resource that the application trusts. Some of the most common variants of untrusted search path are: