CVE-2025-13810: Unveiling the Path Traversal Flaw in WebStack-Guns 1.0

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Overview

CVE-2025-13810 identifies a medium-severity path traversal vulnerability present in jsnjfz WebStack-Guns version 1.0. This flaw allows a remote attacker to manipulate input and potentially access sensitive files on the server by bypassing intended directory access restrictions. The vendor was notified of this vulnerability but did not respond.

Technical Details

The vulnerability resides within the renderPicture function of the KaptchaController.java file (src/main/java/com/jsnjfz/manage/modular/system/controller/KaptchaController.java). By crafting a malicious request, an attacker can manipulate the input parameters to traverse the file system, potentially reading arbitrary files. The exploit is publicly available, increasing the risk of exploitation.

CVSS Analysis

The Common Vulnerability Scoring System (CVSS) score for CVE-2025-13810 is 5.3 (MEDIUM).

  • Attack Vector: Network (AV:N)
  • Attack Complexity: Low (AC:L)
  • Privileges Required: None (PR:N)
  • User Interaction: None (UI:N)
  • Scope: Unchanged (S:U)
  • Confidentiality Impact: Low (C:L)
  • Integrity Impact: None (I:N)
  • Availability Impact: None (A:N)

This score indicates that while the vulnerability is remotely exploitable with relative ease, the primary impact is limited to potential information disclosure (confidentiality).

Possible Impact

Successful exploitation of this vulnerability could lead to:

  • Information Disclosure: An attacker could potentially read sensitive configuration files, source code, or other data stored on the server.
  • Further Exploitation: Gaining access to sensitive information could be a stepping stone to more severe attacks, such as privilege escalation or remote code execution (if combined with other vulnerabilities).

Mitigation Steps

Unfortunately, given the lack of response from the vendor, immediate patching is not available. The following mitigation steps are recommended:

  • Input Validation: Implement strict input validation and sanitization on the renderPicture function (or any similar function handling file paths) to prevent path traversal attempts. Specifically, filter out characters like “..” and ensure that the provided path stays within the intended directory.
  • Web Application Firewall (WAF): Deploy a WAF with rules to detect and block path traversal attacks. Configure the WAF to inspect requests for suspicious patterns in the URL and parameters.
  • Principle of Least Privilege: Ensure that the web server process runs with the minimum necessary privileges. This limits the potential impact of a successful attack.
  • Code Review: Conduct a thorough code review to identify and address any other potential vulnerabilities in the application.
  • Monitor for Suspicious Activity: Implement monitoring and logging to detect unusual file access attempts or other suspicious activity that may indicate an attempted exploit.

References

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