T05 · Unauthorized Access and Privilege Escalation
- Location
SKILL.md:19- Finding
Excessive File-Read and Command-Execution Permissions
- Content
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Vulnerability Details
File Location:
SKILL.md, lines 19–21
Vulnerability Type: Excessive tool permissions and violation of least privilege
Risk Level: MediumVulnerable Code
yaml tools: - read - execTechnical Analysis
The skill requests both local file-reading and command-execution capabilities, despite its stated purpose being the aggregation of public Chinese news. The project does not define a legitimate command-execution workflow, command allowlist, filesystem boundary, approved network destinations, argument validation, or enforceable sandbox policy.
Granting unrestricted
readandexeccapabilities creates a least-privilege violation. If untrusted news content, user input, or subsequent instructions influence the agent's tool calls, those capabilities could be used to read local files or execute arbitrary commands under the agent process's operating-system account.The documentation claims that commands run in a secure sandbox, but the project contains no implementation or configuration that enforces such isolation. No direct malicious command, credential-exfiltration endpoint, persistence mechanism, or privilege-escalation exploit was identified in the reviewed file.
Attack Path
- An agent loads the skill and grants the declared
readandexectools. - A user supplies crafted content, or untrusted retrieved content contains instructions interpreted by the agent.
- Those instructions induce the agent to read a sensitive local file or construct a shell command unrelated to news retrieval.
- The agent invokes the broadly permitted tool without a defined path restriction, command allowlist, or mandatory user confirmation.
- The command executes with the permissions of the agent process, allowing access to resources available to that account.
Exploitation depends on the hosting agent's tool controls and whether it requires confirmation. A correctly enforced sandbox ...[truncated 872 chars]
- An agent loads the skill and grants the declared
- Remediation
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Remediation Suggestions
- Remove the
execpermission unless a specific, indispensable command-execution requirement is documented. - Replace unrestricted file access with a narrowly scoped read capability limited to required project assets.
- Use a dedicated HTTPS retrieval tool for news access rather than a general-purpose shell.
- Define an explicit allowlist of trusted news domains and reject redirects to unapproved destinations.
- If command execution is unavoidable, use fixed executables and argument arrays rather than shell strings, prohibit user-controlled command construction, and enforce a strict command allowlist.
- Run the skill in an isolated container or sandbox with no access to host secrets, SSH material, cloud credentials, or unrelated files.
- Execute under a dedicated unprivileged account with a read-only filesystem wherever possible.
- Require explicit user confirmation before any filesystem access or command execution that is not essential to the stated news-retrieval task.
- Remove guidance encouraging administrator execution and document that elevated privileges are neither required nor supported.
- Add tests verifying that untrusted user or news content cannot trigger arbitrary file reads, shell commands, or access outside approved boundaries.
- Remove the