Summary
AgentScope's Bash Tool has an authorization-checking flaw in its check_permissions function that can allow actions to proceed when they should be denied. Remote exploitation may be possible in deployments where an attacker can reach and invoke the tool; the exact access requirements depend on the deployment.
AgentScope's Bash Tool has an authorization-checking flaw in its check_permissions function that can allow actions to proceed when they should be denied. Remote exploitation may be possible in deployments where an attacker can reach and invoke the tool; the exact access requirements depend on the deployment.
Affected context
The issue affects the Bash Tool in AgentScope, specifically authorization checks performed by check_permissions in src/agentscope/tool/_builtin/_bash.py. Risk depends on whether the tool is available to remote users and how its permissions and access controls are configured.
The issue affects the Bash Tool in AgentScope, specifically authorization checks performed by check_permissions in src/agentscope/tool/_builtin/_bash.py. Risk depends on whether the tool is available to remote users and how its permissions and access controls are configured.
Exploit preconditions
- Attack surface: An AgentScope deployment that exposes or makes the Bash Tool reachable
- Required access: The attacker must be able to reach the relevant tool interface; the description does not specify whether authentication is required
- Trigger point: An invocation that reaches the Bash Tool's permission-checking logic
- Why exploitation is possible: Incorrect authorization can allow an action that should have been denied
- Attack surface: An AgentScope deployment that exposes or makes the Bash Tool reachable
- Required access: The attacker must be able to reach the relevant tool interface; the description does not specify whether authentication is required
- Trigger point: An invocation that reaches the Bash Tool's permission-checking logic
- Why exploitation is possible: Incorrect authorization can allow an action that should have been denied
Why this happens
The flaw is in authorization logic: the permission check does not correctly determine whether an action is allowed. This maps to CWE-863: Incorrect Authorization, a weakness in which access-control decisions may not match the intended policy. More broadly, it is an authorization enforcement failure, rather than a problem with the Bash command parser itself.
The flaw is in authorization logic: the permission check does not correctly determine whether an action is allowed. This maps to CWE-863: Incorrect Authorization, a weakness in which access-control decisions may not match the intended policy. More broadly, it is an authorization enforcement failure, rather than a problem with the Bash command parser itself.
Potential impact
- An attacker may perform Bash Tool actions they are not authorized to perform
- Systems or data accessible to the tool could be exposed or modified
- The issue could provide a path to further compromise, depending on the tool's privileges and deployment boundaries
- An attacker may perform Bash Tool actions they are not authorized to perform
- Systems or data accessible to the tool could be exposed or modified
- The issue could provide a path to further compromise, depending on the tool's privileges and deployment boundaries
General mitigation guidance
Mitigation generally focuses on making authorization decisions explicit, consistent, and fail-closed.
Common defensive patterns include:
- Defining and enforcing a clear allowlist of permitted actions
- Checking authorization at the point where each sensitive action is performed
- Denying requests when identity, permission, or policy evaluation is missing or ambiguous
- Limiting the Bash Tool's privileges and access to files, processes, and other resources
- Restricting who can reach or invoke the tool and reducing trust in caller-supplied data
Mitigation generally focuses on making authorization decisions explicit, consistent, and fail-closed.
Common defensive patterns include:
- Defining and enforcing a clear allowlist of permitted actions
- Checking authorization at the point where each sensitive action is performed
- Denying requests when identity, permission, or policy evaluation is missing or ambiguous
- Limiting the Bash Tool's privileges and access to files, processes, and other resources
- Restricting who can reach or invoke the tool and reducing trust in caller-supplied data
How teams detect issues like this
Look for authorization checks whose results can be bypassed, inconsistently applied, or fail open. Code reviews and static analysis can examine permission-checking logic, sensitive Bash Tool operations, and paths where access decisions are skipped or performed too late. Runtime policies can also restrict tool invocation to approved identities and actions, with logging and alerting for denied or unusual requests.
Look for authorization checks whose results can be bypassed, inconsistently applied, or fail open. Code reviews and static analysis can examine permission-checking logic, sensitive Bash Tool operations, and paths where access decisions are skipped or performed too late. Runtime policies can also restrict tool invocation to approved identities and actions, with logging and alerting for denied or unusual requests.
