CVE-2026-77059 Details
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.
A TOCTOU race condition vulnerability has been identified in boneIO Black versions 1.3.0 prior to 1.6.0. The issue resides in the create_timedatectl_sudoers_file() function, which is responsible for writing, validating, and installing sudoers rules. The vulnerability allows local attackers to exploit the timing gap between validation and installation to inject malicious content or conduct symlink attacks, leading to unauthorized sudoers rule injection and local privilege escalation to root.
Users can upgrade to boneIO Black version 1.6.0, which addresses this vulnerability. Instructions for upgrading are available in the boneIO Black documentation.
Metrics
CVSS 4.0 Severity and Vector Strings:
VolerionCVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
Volerion
Assessed Oct 26, 2026CISA-ADP
Assessed Oct 26, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://boneio.eu/en/docs/black | [email protected] | Vendor |
| https://cert.pl/en/posts/2026/10/CVE-2026-77052 | [email protected] | AdvisoryBundleRemedy |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-367 | Time-of-check Time-of-use (TOCTOU) Race Condition | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| boneIO Black | >= 1.3.0, <= 1.6.0 (semver) |
CPE
Remediation
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Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Oct 26, 2026 | CVE Modified | CISA-ADP |
| Oct 26, 2026 | New CVE Received | [email protected] |