CVE-2025-13698

23.12.2025, 22:15

Deciso OPNsense diag_backup.php filename Directory Traversal Arbitrary File Creation Vulnerability. This vulnerability allows network-adjacent attackers to create arbitrary files on affected installations of Deciso OPNsense. Authentication is required to exploit this vulnerability.

The specific flaw exists within the handling of backup configuration files. The issue results from the lack of proper validation of a user-supplied path prior to using it in file operations. An attacker can leverage this vulnerability to create files in the context of root. Was ZDI-CAN-28133.

Path Traversal

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
NIST	NIST	4.5 MEDIUM	ADJACENT_NETWORK	LOW	HIGH	CVSS:3.0/AV:A/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
zdi	CNA	4.5 MEDIUM				CVSS:3.0/AV:A/AC:L/PR:H/UI:N/S:U/C:N/I:H/A:N
CISA-ADP	ADP	---				---

Base Score

CVSS 3.x

EPSS Score

Percentile: Unknown

Common Weakness Enumeration

CWE-22 - Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
The software uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the software does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Vulnerability Media Exposure

[GERMAN] OPNsense: Schwachstelle ermöglicht Manipulation von Dateien
Ein Angreifer aus einem angrenzenden Netzwerk kann eine Schwachstelle in OPNsense ausnutzen, um beliebige Dateien mit Root-Rechten zu erstellen.
Published: 2025-11-25T23:00:00+00:00

References

https://github.com/opnsense/core/commit/cb15c935137d05c86a1e6cf12af877e9c32a23af

https://www.zerodayinitiative.com/advisories/ZDI-25-1022/