Slither, the Solidity source analyzer

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.

Features

• Detects vulnerable Solidity code with low false positives
• Identifies where the error condition occurs in the source code
• Easy integration into continuous integration pipelines
• Built-in 'printers' quickly report crucial contract information
• Detector API to write custom analyses in Python
• Ability to analyze contracts written with Solidity >= 0.4
• Intermediate representation (SlithIR) enables simple, high-precision analyses

Usage

$ 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 of the directory. All vulnerability checks are run by default.

Configuration

• --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 JSON

Detectors

By default, all the detectors are run. Use --detectors comma-separated list of detectors to 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 an arbitrary destination	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	const-candidates-state	State variables that could be declared constant	Informational	High
10	low-level-calls	Low level calls	Informational	High
11	naming-convention	Conformance to Solidity naming conventions	Informational	High
12	pragma	If different pragma directives are used	Informational	High
13	solc-version	If an old version of Solidity used (<0.4.23)	Informational	High
14	unused-state	Unused state variables	Informational	High

Contact us to get access to additional detectors.

Printers

Use --printers comma-separated list of printers.

Num	Printer	Description
1	call-graph	the call graph
2	contract-summary	a summary of the contract
3	function-summary	the summary of the functions
4	inheritance	the inheritance relation between contracts
5	inheritance-graph	the inheritance graph
6	slithir	the slithIR
7	vars-and-auth	the state variables written and the authorization of the functions

How to install

Slither requires Python 3.6+ and solc, the Solidity compiler.

Using Pip

$ pip install slither-analyzer

Using Git

$ git clone https://github.com/trailofbits/slither.git && cd slither
$ python setup.py install 

Getting Help

Feel free to stop by our Slack channel (#ethereum) for help using or extending Slither.

• The Printer documentation describes the information Slither is capable of visualizing for each contract.

• The Detector documentation describes how to write a new vulnerability analyses.

• The API documentation describes the methods and objects available for custom analyses.

• The SlithIR documentation describes the SlithIR intermediate representation.

License

Slither is licensed and distributed under the AGPLv3 license. Contact us if you're looking for an exception to the terms.