Description
boneIO Black contains a TOCTOU race condition in the create_timedatectl_sudoers_file() function in boneio/webui/routes/timezone_sudoers.py. The function writes sudoers rules to a predictable temporary file, validates them, then installs them with root privileges. A local attacker can exploit the race window between validation and installation to substitute malicious content, or use the predictable filename for symlink attacks, resulting in arbitrary sudoers rule injection and local privilege escalation to root.

This issue was fixed in version 1.6.0.
Published: 2026-10-26
Score: 8.8 High
EPSS: n/a
KEV: No
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Remediation

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History

Mon, 26 Oct 2026 17:30:00 +0100

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}

Mon, 26 Oct 2026 16:00:00 +0100

Type Values Removed Values Added
Description boneIO Black contains a TOCTOU race condition in the create_timedatectl_sudoers_file() function in boneio/webui/routes/timezone_sudoers.py. The function writes sudoers rules to a predictable temporary file, validates them, then installs them with root privileges. A local attacker can exploit the race window between validation and installation to substitute malicious content, or use the predictable filename for symlink attacks, resulting in arbitrary sudoers rule injection and local privilege escalation to root. This issue was fixed in version 1.6.0.
Title TOCTOU Race Condition in boneIO
First Time appeared Boneio
Boneio boneio
Weaknesses CWE-367
CPEs cpe:2.3:a:boneio:boneio:*:*:*:*:*:*:*:*
Vendors & Products Boneio
Boneio boneio
References
Metrics cvssV4_0

{'score': 8.8, 'vector': 'CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H'}

Subscriptions

Boneio Boneio
cve-icon MITRE

Status: PUBLISHED

Assigner: CERT-PL

Published:

Updated: 2026-10-26T15:35:50.139Z

Reserved: 2026-08-20T09:37:37.787Z

Link: CVE-2026-77059

cve-icon Vulnrichment

Updated: 2026-10-26T15:32:02.203Z

cve-icon NVD

Status : Received

Published: 2026-10-26T15:16:43.787

Modified: 2026-10-26T16:17:22.343

Link: CVE-2026-77059

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses
  • CWE-367

    Time-of-check Time-of-use (TOCTOU) Race Condition