Slither is a Solidity static analysis framework written in Python 3. It runs a suite of vulnerability detectors, prints visual information about contract details, and provides an API to easily write custom analyses. Slither enables developers to find vulnerabilities, enhance their code comphrehension, and quickly prototype custom analyses.
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Run Slither on a Truffle application:
truffle compile
slither .
Run Slither on a single file:
$ slither tests/uninitialized.sol # argument can be file, folder or glob, be sure to quote the argument when using a glob
[..]
INFO:Detectors:Uninitialized state variables in tests/uninitialized.sol, Contract: Uninitialized, Vars: destination, Used in ['transfer']
[..]
If Slither is run on a directory, it will run on every .sol file in the directory.
--solc SOLC: Path to solc (default ‘solc’)--solc-args SOLC_ARGS: Add custom solc arguments. SOLC_ARGS can contain multiple arguments--disable-solc-warnings: Do not print solc warnings--solc-ast: Use the solc AST file as input (solc file.sol --ast-json > file.ast.json)--json FILE: Export results as JSONBy default, all the detectors are run.
| Num | Detector | What it Detects | Impact | Confidence |
|---|---|---|---|---|
| 1 | suicidal | Suicidal functions | High | High |
| 2 | uninitialized-state | Uninitialized state variables | High | High |
| 3 | uninitialized-storage | Uninitialized storage variables | High | High |
| 4 | arbitrary-send | Functions that send ether to arbitrary destinations | High | Medium |
| 5 | reentrancy | Reentrancy vulnerabilities | High | Medium |
| 6 | locked-ether | Contracts that lock ether | Medium | High |
| 7 | tx-origin | Dangerous usage of tx.origin | Medium | Medium |
| 8 | assembly | Assembly usage | Informational | High |
| 9 | constable-states | State variables that could be declared constant | Informational | High |
| 10 | external-function | Public function that could be declared as external | Informational | High |
| 11 | low-level-calls | Low level calls | Informational | High |
| 12 | naming-convention | Conformance to Solidity naming conventions | Informational | High |
| 13 | pragma | If different pragma directives are used | Informational | High |
| 14 | solc-version | Old versions of Solidity (< 0.4.23) | Informational | High |
| 15 | unused-state | Unused state variables | Informational | High |
To run a printer, use --printers and a comma-separated list of printers.
| Num | Printer | Description |
|---|---|---|
| 1 | call-graph | Export the call-graph of the contracts to a dot file |
| 2 | contract-summary | Print a summary of the contracts |
| 3 | function-summary | Print a summary of the functions |
| 4 | inheritance | Print the inheritance relations between contracts |
| 5 | inheritance-graph | Export the inheritance graph of each contract to a dot file |
| 6 | slithir | Print the slithIR representation of the functions |
| 7 | vars-and-auth | Print the state variables written and the authorization of the functions |
Slither requires Python 3.6+ and solc, the Solidity compiler.
$ pip install slither-analyzer
$ git clone https://github.com/trailofbits/slither.git && cd slither
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