T08 · Insecure Dependencies
- Location
scripts/chord_identifier.py:267- Finding
Execution of an Unverified External Cargo Project
- Content
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Vulnerability Details
File Location:
scripts/chord_identifier.py:267-288
Vulnerability Type: Untrusted external dependency execution
Risk Level: MediumComplete Code Snippet
python def get_ascii_chord(chord_name): """调用 ascii_chord 获取和弦图""" import os # 转换和弦名格式 chord_name = chord_name.replace('bb', '#') try: home = os.path.expanduser('~') cwd = os.path.join(home, 'workspace', 'ascii_chord') result = subprocess.run( ['cargo', 'run', '--', 'get', chord_name], cwd=cwd, capture_output=True, text=True, timeout=10 ) if result.returncode == 0: return result.stdout else: return None except Exception as e: return NoneTechnical Analysis
When diagram rendering is requested, the Skill executes
cargo runinside~/workspace/ascii_chord. This project is outside the audited Skill package and is not pinned, authenticated, or checked for integrity before execution.Running a Cargo project may execute its compiled binary, build scripts such as
build.rs, procedural macros, and code from resolved dependencies. Consequently, possession or modification of the expected directory provides a code-execution path.The subprocess uses an argument list rather than
shell=True, so the user-provided chord name does not directly create a shell-command injection vulnerability. The issue is instead the unconditional trust placed in a mutable, unaudited external project and its dependency graph. The ten-second timeout limits waiting time but does not prevent code execution or reverse actions already performed.Attack Path
- An attacker creates or modifies
~/workspace/ascii_chord, its Cargo configuration, source files, build script, or resolved dependencies. - The user or Agent invokes a diagram-related operation, such as a chord lookup with
--diagramor an inversion with dia ...[truncated 940 chars]
- An attacker creates or modifies
- Remediation
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Remediation Suggestions
- Remove the runtime dependency on a mutable project under the user's home directory. Implement diagram generation directly in the audited package where feasible.
- If the Rust component is required, include its reviewed source in the Skill package and invoke a fixed, packaged artifact rather than using
cargo run. - Pin all Rust dependencies with a committed
Cargo.lock, review build scripts and procedural macros, and verify the packaged component using a trusted cryptographic digest. - Resolve and validate the component's canonical path before execution. Reject symbolic links and paths outside an explicitly approved installation directory.
- Build the component during a trusted installation phase and run only the verified binary at runtime; do not permit runtime dependency resolution or compilation.
- Execute the helper with a minimal environment and least privileges, restrict filesystem and network access through sandboxing, and retain the existing argument-array invocation.
- Require explicit user consent before invoking an external executable and report failures clearly rather than silently suppressing every exception.