Published:2012/02/13  Last Updated:2012/02/13

ALFTP may insecurely load executable files


ALFTP may use unsafe methods for determining how to load executables.

Products Affected

  • ALFTP and earlier


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.


An attacker may execute arbitrary code with the privilege of the running application.


Update the software
Update to ALFTP 5.31 or later according to the information provided by the developer.

Vendor Status

Vendor Status Last Update Vendor Notes
ESTsoft Corp. vulnerable 2012/02/13


JPCERT/CC Addendum

Vulnerability Analysis by JPCERT/CC

Analyzed on 2012.02.13

Measures Conditions Severity
Access Required can be attacked over the Internet using packets
  • High
Authentication anonymous or no authentication (IP addresses do not count)
  • High
User Interaction Required the user must be convinced to take a standard action that does not feel harmful to most users, such as click on a link or view a file
  • Mid
Exploit Complexity some expertise and/or luck required (most buffer overflows, guessing correctly in small space, expertise in Windows function calls)
  • Mid-High

Description of each analysis measures


Fumihiko Sano reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.

Other Information

JPCERT Reports
CERT Advisory
CPNI Advisory
CVE CVE-2012-0315
JVN iPedia JVNDB-2012-000011