CVE-2025-66004
Description
A local path traversal vulnerability in usbmuxd allows unprivileged users to send crafted messages to its world-writable UNIX socket, causing the daemon to create or delete files as the usbmux user. Due to insufficient validation of the PairRecordID field, attackers can escape the intended configuration directory, with a narrow race condition potentially enabling broader file overwrite. The issue is limited to local access and does not directly grant root privileges.
Statement
This issue is best classified as a Moderate vulnerability rather than an Important flaw because its impact is constrained to a local privilege boundary and a non-root service account. Exploitation requires local access to the system and interaction with a UNIX socket, with no remote attack vector or user interaction involved. While the lack of input validation allows path traversal leading to file deletion or creation, these operations are performed as the usbmux user, not as root, and therefore do not directly compromise full system integrity. The potential extension to arbitrary file overwrite relies on a tight race condition (TOCTOU), which reduces reliability and exploit consistency. There is no direct confidentiality impact and no automatic escalation beyond the service’s privilege scope, making the flaw security-relevant but limited in blast radius, aligning it with a medium (moderate) severity classification rather than a high-impact vulnerability.
Mitigation
No mitigation is currently available that meets Red Hat Product Security’s standards for usability, deployment, applicability, or stability.
Common Vulnerability Scoring System (CVSS) Score Details
Info alert:Important note
CVSS scores for open source components depend on vendor-specific factors (e.g. version or build chain). Therefore, Red Hat's score and impact rating can be different from NVD and other vendors. Red Hat remains the authoritative CVE Naming Authority (CNA) source for its products and services (see Red Hat classifications).
The following CVSS metrics and score provided are preliminary and subject to review.
CVSS v3 Score Breakdown
| Red Hat | NVD | cve.org | |
|---|---|---|---|
| Base Score | 5.7 | N/A | N/A |
| Attack Vector | Local | N/A | N/A |
| Attack Complexity | Low | N/A | N/A |
| Privileges Required | None | N/A | N/A |
| User Interaction | None | N/A | N/A |
| Scope | Changed | N/A | N/A |
| Confidentiality | None | N/A | N/A |
| Integrity Impact | Low | N/A | N/A |
| Availability Impact | Low | N/A | N/A |
Vector
Red Hat: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L
Understanding the Weakness (CWE)
Confidentiality,Integrity
Technical Impact: Read Files or Directories; Modify Files or Directories; Bypass Protection Mechanism
Not properly neutralizing '.../...//' (doubled triple dot slash) allows attackers to traverse the file system to access files or directories that are outside of the restricted directory.
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