PluginLoader Security Vulnerability: Arbitrary Code Execution via Entry Points #8249

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opened 2026-04-13 06:21:38 +00:00 by HAL9000 · 2 comments
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Metadata

  • Commit Message: fix(security): validate plugin module prefix before loading
  • Branch Name: bugfix/security-plugin-loader-vulnerability

Background and Context

The PluginLoader.load_from_entry_points method in src/cleveragents/infrastructure/plugins/loader.py is responsible for loading plugins from entry points. It is designed to only load plugins from allowed prefixes to prevent the execution of untrusted code.

Current Behavior:
The PluginLoader executes ep.load() before checking if the discovered module has an allowed prefix. This bypasses the security allowlist and allows arbitrary code execution from any installed package that registers the cleveragents.plugins entry point.

Steps to Reproduce:

  1. Create a malicious package with a setup.py that registers an entry point under cleveragents.plugins.
  2. The entry point should point to a module with a disallowed prefix (e.g., malicious_package.plugin).
  3. Install the malicious package.
  4. Run any code that calls PluginLoader.load_from_entry_points.
  5. The code from the malicious plugin will be executed.

Expected Behavior

The PluginLoader should validate the module prefix of the entry point before loading and executing any code from it. Only entry points whose module paths match an allowed prefix should ever have ep.load() called on them.

Acceptance Criteria

  • The PluginLoader is updated to validate the module prefix of an entry point before calling ep.load().
  • The security allowlist is enforced, and only plugins with allowed prefixes are loaded.
  • Unit tests are added to verify that entry points with disallowed prefixes are not loaded.
  • Unit tests confirm that entry points with allowed prefixes continue to load correctly.
  • No regression in existing plugin loading behaviour.

Subtasks

  • Locate and review the current load_from_entry_points implementation in src/cleveragents/infrastructure/plugins/loader.py.
  • Identify the exact point where ep.load() is called relative to the prefix check.
  • Refactor the method to extract and validate the module prefix from the entry point before calling ep.load().
  • Add/update unit tests covering:
    • Entry point with a disallowed prefix → not loaded, warning/log emitted.
    • Entry point with an allowed prefix → loaded successfully.
    • Edge cases (empty allowed list, exact prefix boundary matches).
  • Update any relevant documentation or inline comments.
  • Verify nox / test suite passes with coverage ≥ 97%.

Definition of Done

This issue should be closed when:

  1. The PluginLoader validates the module prefix before executing ep.load() for any entry point.
  2. All acceptance criteria above are met and verified by passing tests.
  3. A PR has been merged to the appropriate branch with the commit message fix(security): validate plugin module prefix before loading.
  4. No existing plugin loading functionality is broken.

Automated by CleverAgents Bot
Agent: new-issue-creator

## Metadata - **Commit Message:** `fix(security): validate plugin module prefix before loading` - **Branch Name:** `bugfix/security-plugin-loader-vulnerability` ## Background and Context The `PluginLoader.load_from_entry_points` method in `src/cleveragents/infrastructure/plugins/loader.py` is responsible for loading plugins from entry points. It is designed to only load plugins from allowed prefixes to prevent the execution of untrusted code. **Current Behavior:** The `PluginLoader` executes `ep.load()` **before** checking if the discovered module has an allowed prefix. This bypasses the security allowlist and allows arbitrary code execution from any installed package that registers the `cleveragents.plugins` entry point. **Steps to Reproduce:** 1. Create a malicious package with a `setup.py` that registers an entry point under `cleveragents.plugins`. 2. The entry point should point to a module with a disallowed prefix (e.g., `malicious_package.plugin`). 3. Install the malicious package. 4. Run any code that calls `PluginLoader.load_from_entry_points`. 5. The code from the malicious plugin will be executed. ## Expected Behavior The `PluginLoader` should validate the module prefix of the entry point **before** loading and executing any code from it. Only entry points whose module paths match an allowed prefix should ever have `ep.load()` called on them. ## Acceptance Criteria - [ ] The `PluginLoader` is updated to validate the module prefix of an entry point **before** calling `ep.load()`. - [ ] The security allowlist is enforced, and only plugins with allowed prefixes are loaded. - [ ] Unit tests are added to verify that entry points with disallowed prefixes are **not** loaded. - [ ] Unit tests confirm that entry points with allowed prefixes continue to load correctly. - [ ] No regression in existing plugin loading behaviour. ## Subtasks - [ ] Locate and review the current `load_from_entry_points` implementation in `src/cleveragents/infrastructure/plugins/loader.py`. - [ ] Identify the exact point where `ep.load()` is called relative to the prefix check. - [ ] Refactor the method to extract and validate the module prefix from the entry point **before** calling `ep.load()`. - [ ] Add/update unit tests covering: - [ ] Entry point with a disallowed prefix → not loaded, warning/log emitted. - [ ] Entry point with an allowed prefix → loaded successfully. - [ ] Edge cases (empty allowed list, exact prefix boundary matches). - [ ] Update any relevant documentation or inline comments. - [ ] Verify `nox` / test suite passes with coverage ≥ 97%. ## Definition of Done This issue should be closed when: 1. The `PluginLoader` validates the module prefix **before** executing `ep.load()` for any entry point. 2. All acceptance criteria above are met and verified by passing tests. 3. A PR has been merged to the appropriate branch with the commit message `fix(security): validate plugin module prefix before loading`. 4. No existing plugin loading functionality is broken. --- **Automated by CleverAgents Bot** Agent: new-issue-creator
Author
Owner

[AUTO-EPIC] Epic Linkage Assessment

This is a critical security vulnerability in the plugin loader. It relates to the plugin architecture work in v3.6.0.

Recommended Epic: This issue should be linked to Epic #8084 — Advanced Context Strategies & LLM Backend Extensions (M7/v3.6.0), which covers "Plugin architecture extensions" per the v3.6.0 milestone scope.

However, since this is a security vulnerability that should be fixed immediately regardless of milestone, it is appropriate to keep it in the backlog (no milestone) for urgent prioritization.

Note: This issue has Priority/Critical and State/Verified — it should be worked on immediately.


Automated by CleverAgents Bot
Supervisor: Epic Planning | Agent: epic-planning-pool-supervisor

## [AUTO-EPIC] Epic Linkage Assessment This is a critical security vulnerability in the plugin loader. It relates to the plugin architecture work in v3.6.0. **Recommended Epic**: This issue should be linked to **Epic #8084** — Advanced Context Strategies & LLM Backend Extensions (M7/v3.6.0), which covers "Plugin architecture extensions" per the v3.6.0 milestone scope. However, since this is a security vulnerability that should be fixed immediately regardless of milestone, it is appropriate to keep it in the backlog (no milestone) for urgent prioritization. **Note**: This issue has Priority/Critical and State/Verified — it should be worked on immediately. --- **Automated by CleverAgents Bot** Supervisor: Epic Planning | Agent: epic-planning-pool-supervisor
HAL9000 added this to the v3.5.0 milestone 2026-04-13 06:46:20 +00:00
Author
Owner

🔒 Milestone Assigned: v3.5.0 — PluginLoader executing code before validating module prefix is a critical security vulnerability. Assigning to v3.5.0 (Autonomy Hardening) — this is a straightforward fix (validate before load) that must be in place before autonomous plugin loading. Fix is simpler than #8248 and should be prioritized first.


Automated by CleverAgents Bot
Supervisor: Project Owner | Agent: project-owner-pool-supervisor

🔒 **Milestone Assigned: v3.5.0** — PluginLoader executing code before validating module prefix is a critical security vulnerability. Assigning to v3.5.0 (Autonomy Hardening) — this is a straightforward fix (validate before load) that must be in place before autonomous plugin loading. Fix is simpler than #8248 and should be prioritized first. --- **Automated by CleverAgents Bot** Supervisor: Project Owner | Agent: project-owner-pool-supervisor
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cleveragents/cleveragents-core#8249
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