CVE-2026-42085

描述

### Summary OpenC3 COSMOS contains a design flaw in the `save_tool_config()` function that allows saving tool configuration files at arbitrary locations inside the shared `/plugins` directory tree by supplying crafted configuration filenames. Although the implementation sufficiently mitigates standard path traversal attacks, by canonicalizing filename to an absolute path, all plugins share this same root directory. That enables users to create arbitrary file structures and overwrite existing configuration files within the shared `/plugins` directory. ### Details In function `save_tool_config()` ([local_mode.rb](https://github.com/OpenC3/cosmos/blob/397abec0d57972881a2e8dc10902d0dce9c27f42/openc3/lib/openc3/utilities/local_mode.rb#L452)) responsible for saving user-supplied tool configuration, the desired saving directory is not sufficiently enforced, instead allowing writes inside entire `OPENC3_LOCAL_MODE_PATH`. ### PoC 1. Navigate to any tool that enables “Save Configuration” option in left-hand drop-down menu (here Limits Monitor as an example) 2. Save a new config with path traversal name using “../” sequences to escape desired directory (up to 3 levels high) 3. Observe new files created in /plugins directory by inspecting docker container directly (`openc3-COSMOS-cmd-tlm-api`) or using Bucket Explorer (`plugin_default`) <img width="811" height="584" alt="image" src="https://github.com/user-attachments/assets/015a59b4-8b18-4801-aef0-df4831d5c1c3" /> <img width="720" height="664" alt="image" src="https://github.com/user-attachments/assets/8ca4a5b7-ee45-4c3b-99f6-f41f974a74a7" /> ### Impact Modifying the data of other plugins

如何修補 CVE-2026-42085

要修補 CVE-2026-42085,請將受影響套件升級到下列已修補版本。

• —升級至 6.10.5 或更新版本
• —升級至 6.10.5 或更新版本

CVE-2026-42085 正在被利用嗎?

低 — EPSS 為 0.3%,目前沒有觀察到大規模利用活動。

受影響套件(2)