T05 · Unauthorized Access and Privilege Escalation
Warning
- Location
- config.json:22
- Finding
- Unnecessary Command-Execution Capability Violates Least Privilege## Vulnerability Details **File Location**: `config.json`, lines 22–29 **Vulnerability Type**: Excessive system capability **Risk Level**: Medium ### Vulnerable Configuration ```json "capabilities": [ "read", "write", "edit", "exec", "pdf", "image" ] ``` ### Technical Analysis The Skill requests the `exec` capability, which can permit operating-system command execution. The documented functionality in `SKILL.md` consists of reading, formatting, summarizing, translating, converting, writing, and renaming content. No documented workflow requires shell-command execution, and the `SKILL.md` front matter does not list `exec` as a required tool. Consequently, granting `exec` exceeds the Skill's stated operational requirements and violates the principle of least privilege. Although the reviewed package contains no executable scripts or direct malicious command, this unnecessary permission expands the potential impact of attacker-controlled content, unsafe future instructions, or an Agent decision that causes command execution. ### Attack Path 1. The Skill is installed or activated with the capabilities declared in `config.json`. 2. The runtime grants the Agent access to the unnecessary `exec` capability. 3. The Agent processes attacker-controlled content or receives a later instruction that influences its tool selection. 4. The influenced Agent invokes `exec` with an unsafe command. 5. The command executes with the operating-system privileges and environmental access available to the Agent process. This is a capability-enabled attack path rather than evidence of an embedded payload; no direct invocation of `exec` was found in the audited files. ### Impact Assessment Successful exploitation could permit arbitrary local command execution within the privileges of the Agent process. Depending on runtime isolation and host permissions, this may expose readable files, allow modification or deletion of ...[truncated 430 chars]
- Remediation
- ## Remediation Suggestions 1. Remove `exec` from the `capabilities` array because no documented feature requires operating-system command execution. 2. Review every remaining capability against actual workflows and remove `image` as well unless a concrete image-processing feature requires it. 3. Restrict `read`, `write`, and `edit` operations to explicitly approved input and output directories. 4. Require user confirmation before overwriting, renaming, or deleting existing files. 5. If command execution becomes necessary in a future release, expose narrowly scoped operations instead of a general shell, use fixed executable and argument allowlists, reject shell metacharacters, apply sandboxing, and require explicit user approval. 6. Keep the capability declarations in `config.json` and the requirements documented in `SKILL.md` synchronized, and add an automated check that rejects undeclared or unjustified privileges.