T05 · Unauthorized Access and Privilege Escalation
- Location
config.json:21- Finding
Excessive and Undisclosed Command-Execution Capability
- Content
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Vulnerability Details
File Location:
config.json, lines 21–26
Vulnerability Type: Excessive privilege and permission declaration mismatch
Risk Level: MediumComplete Code Snippet:
json "capabilities": [ "web_fetch", "read", "write", "exec" ],Technical Analysis
The configuration grants the Skill the
execcapability, which can permit local command execution. This capability exceeds the requirements declared inSKILL.md, where onlyweb_fetch,read, andwriteare listed, and it is not needed by the documented webpage retrieval and data-export workflows.Granting arbitrary execution capability without a documented operational requirement violates the principle of least privilege. Although the reviewed package contains no executable implementation or demonstrated malicious command, retaining
execunnecessarily expands the authority available to the Skill and increases the consequences of malicious, compromised, or manipulated instructions.Attack Path
- The runtime loads
config.jsonand grants the declared capabilities. - A user activates the Skill for a web-scraping or data-export task.
- Malicious or externally manipulated instructions cause the Skill to request an unrelated local command through
exec. - If the runtime authorizes the request based on this capability, the command executes with the privileges of the Agent process.
- The command may access or modify resources available to that process.
This is a capability-based attack path. The reviewed files do not contain an implementation that actively performs these exploitation steps.
Impact Assessment
Successful exploitation could allow execution of arbitrary local commands within the security context of the Agent runtime. Depending on runtime isolation and operating-system permissions, this may expose local files, permit modification of accessible data, launch additional processes, or ...[truncated 184 chars]
- The runtime loads
- Remediation
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Remediation Suggestions
- Remove
execfrom thecapabilitiesarray because the documented functionality only requires webpage retrieval and file operations. - Keep permission declarations consistent across
config.jsonandSKILL.md. - If command execution is genuinely required, document each legitimate use case and replace unrestricted execution with a narrowly scoped command allowlist.
- Validate command names and arguments against fixed schemas; do not pass webpage content, selectors, URLs, filenames, or other untrusted values to a shell.
- Execute any required subprocess in a sandbox with minimal filesystem access, restricted network access, resource limits, and a dedicated low-privilege identity.
- Require explicit user confirmation before executing commands that modify files, start processes, or access sensitive resources.
- Add automated checks that reject capability declarations not justified by the Skill's documented behavior.
- Remove