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CVE-2023-45858 – Unauthenticated Directory Traversal (Local File Disclosure) – PRTG Network Monitor

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Summary

CVE-2023-45858 is a directory traversal vulnerability (CWE-23) in the PRTG Network Monitor webserver that allows an unauthenticated remote attacker to read arbitrary local files on the host. It affects Paessler PRTG Network Monitor before version 23.4.88.1429 and carries a CVSS v3.1 base score of 8.6 (High).

Technical details

  • Root cause: Insufficient sanitization of path input in the PRTG webserver component, allowing relative path (directory traversal) sequences to escape the intended file/directory scope.
  • Trigger conditions: An attacker sends a specially crafted HTTP request containing path traversal sequences to the exposed PRTG web interface; no authentication or user interaction is required to trigger the flaw.
  • Attack vector: Network — exploitable remotely over HTTP/HTTPS against the PRTG webserver.
  • Impact: Disclosure of local files on the underlying server (confidentiality impact rated High), with no reported impact to integrity or availability. Exposed files could include configuration data or other sensitive information that aids further compromise.

Affected software

  • Paessler PRTG Network Monitor, all versions before 23.4.88.1429

Severity

  • CVSS v3.1 Base Score: 8.6 (High)
  • Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Mitigation and recommended actions

  • Immediate: Upgrade Paessler PRTG Network Monitor to version 23.4.88.1429 or later, where the path traversal issue has been fixed.
  • If immediate patching is not possible: Restrict network access to the PRTG web interface (e.g., limit exposure to trusted internal networks or VPN, and avoid exposing the PRTG webserver directly to the internet) until the update can be applied, and monitor web server logs for suspicious requests containing path traversal sequences.

References

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