EasyCTF vulnerable to arbitrary file creation


EasyCTF is a server side CGI used to score CTF (Capture The Flag). EasyCTF contains a vulnerability that may allow a remote attacker to create arbitrary files (CWE-22).

Shoji Baba reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.
CVSS Severity (What is CVSS?)

CVSS V2 Severity:
Base Metrics 6.5 (Medium) [IPA Score]
  • Access Vector: Network
  • Access Complexity: Low
  • Authentication: Single Instance
  • Confidentiality Impact: Partial
  • Integrity Impact: Partial
  • Availability Impact: Partial
Affected Products

Hiroaki Sakai
  • EasyCTF -1.3 and earlier


An arbitrary file created by an attacker may result in arbitrary code being executed on the server.

[Update the Software]
Update to the latest version according to the information provided by the developer.
Vendor Information

Hiroaki Sakai
CWE (What is CWE?)

  1. Path Traversal(CWE-22) [IPA Evaluation]
CVE (What is CVE?)

  1. CVE-2015-0912

  1. JVN : JVN#67520407
  2. National Vulnerability Database (NVD) : CVE-2015-0912
Revision History

  • [2015/05/01]
      Web page was published
      References : Content was added