Untrusted search path vulnerability in ALFTP before 5.31 allows local users to gain privileges via a Trojan horse executable file in a directory that is accessed for reading an extensionless file, as demonstrated by executing the README.exe file when a user attempts to access the README file.

Untrusted search path vulnerability in ALFTP before 5.31 allows local users to gain privileges via a Trojan horse executable file in a directory that is accessed for reading an extensionless file, as demonstrated by executing the README.exe file when a user attempts to access the README file.

ALFTP may use unsafe methods for determining how to load executables. ALFTP provided by ESTsoft Corp. is a FTP client software with the built in FTP server. ALFTP contains an issue when loading files. For example, if an user tries to open README (a file without extention) which exists in the same directory where README.exe (a file with .exe extention) exists, README.exe is executed instead of README. Fumihiko Sano reported this vulnerability to IPA. JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.