Explzh vulnerable to directory traversal


Explzh is a file compression/extraction software supporting multiple file formats. Explzh contains a directory traversal vulnerability (CWE-22).

Explzh is not vulnerable to relative path traversal but to absolute path traversal. Therefore, an attacker may create new files or overwrite existing files on the directory accessible with the privileges for extracting files with Explzh.

Yuji Tounai of NTT Communications Corporation reported this vulnerability to IPA.
JPCERT/CC coordinated with the developer under Information Security Early Warning Partnership.
CVSS Severity (What is CVSS?)

CVSS V3 Severity:
Base Metrics 3.3 (Low) [IPA Score]
  • Attack Vector: Local
  • Attack Complexity: Low
  • Privileges Required: None
  • User Interaction: Required
  • Scope: Unchanged
  • Confidentiality Impact: None
  • Integrity Impact: Low
  • Availability Impact: None
CVSS V2 Severity:
Base Metrics 4.3 (Medium) [IPA Score]
  • Access Vector: Network
  • Access Complexity: Medium
  • Authentication: None
  • Confidentiality Impact: None
  • Integrity Impact: Partial
  • Availability Impact: None
Affected Products

pon software
  • Explzh v.7.58 and earlier


By extracting a malicious compressed file, an attacker may create arbitrary files or overwrite existing files in the directory that is different from the extraction/saving destination configured on the affected product.

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

pon software
CWE (What is CWE?)

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

  1. CVE-2018-0646

  1. JVN : JVN#55813866
  2. National Vulnerability Database (NVD) : CVE-2018-0646
Revision History

  • [2018/07/13]
      Web page was published
  • [2019/07/25]
      References : Content was added