Description
Microsoft UFO is an open-source framework for intelligent automation across devices and platforms. Prior to 3.0.9, the execute_command tool in ufo/client/mcp/http_servers/linux_mcp_server.py treats sort and uniq as read-only commands while the free-form command parameter can select their file-output forms. An authenticated caller can use sort -o or the optional second uniq operand to create or overwrite files writable by the UFO server process without shell metacharacters, because the allowed binary opens the destination itself and the argument policy does not reject the operation. This can corrupt configuration or other writable data and disrupt the service, but the demonstrated primitive does not directly disclose files or establish arbitrary code execution. This issue is fixed in version 3.0.9.
Published: 2026-10-06
Score: 5.4 Medium
EPSS: n/a
KEV: No
AI Analysis

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Remediation

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History

Tue, 06 Oct 2026 15:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

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


Tue, 06 Oct 2026 14:15:00 +0000

Type Values Removed Values Added
Description Microsoft UFO is an open-source framework for intelligent automation across devices and platforms. Prior to 3.0.9, the execute_command tool in ufo/client/mcp/http_servers/linux_mcp_server.py treats sort and uniq as read-only commands while the free-form command parameter can select their file-output forms. An authenticated caller can use sort -o or the optional second uniq operand to create or overwrite files writable by the UFO server process without shell metacharacters, because the allowed binary opens the destination itself and the argument policy does not reject the operation. This can corrupt configuration or other writable data and disrupt the service, but the demonstrated primitive does not directly disclose files or establish arbitrary code execution. This issue is fixed in version 3.0.9.
Title Microsoft UFO: Arbitrary file write in the Linux MCP `execute_command` tool
Weaknesses CWE-184
CWE-88
References
Metrics cvssV3_1

{'score': 5.4, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:N/I:H/A:L'}


Subscriptions

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cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2026-10-06T14:47:07.288Z

Reserved: 2026-10-05T20:37:19.363Z

Link: CVE-2026-105789

cve-icon Vulnrichment

Updated: 2026-10-06T14:35:27.528Z

cve-icon NVD

Status : Deferred

Published: 2026-10-06T14:17:40.270

Modified: 2026-10-06T15:18:12.170

Link: CVE-2026-105789

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-06T18:45:05Z

Weaknesses
  • CWE-184

    Incomplete List of Disallowed Inputs

  • CWE-88

    Improper Neutralization of Argument Delimiters in a Command ('Argument Injection')