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
  • Detection of most major smart contract vulnerabilities
  • Detection of poor coding practices
• Identifies where the error condition occurs in the source code
• Easy integration into continuous integration pipelines
• Four 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

Slither possesses it's own intermediate representation, called SlithIR.

Usage

$ slither tests/uninitialized.sol
[..]
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
• --exclude-name: Excludes the detector name from analysis

Printers

• --printer-summary: Print a summary of the contracts
• --printer-quick-summary: Print a quick summary of the contracts
• --printer-inheritance: Print the inheritance relations
• --printer-inheritance-graph: Print the inheritance graph in a file
• --printer-vars-and-auth: Print the variables written and the check on msg.sender of each function

Checks available

By default, all the checks are run.

Check	Purpose	Impact	Confidence
--detect-arbitrary-send	Detect functions sending ethers to an arbitrary destination	High	Medium
--detect-reentrancy	Detect reentrancy vulnerabilities	High	Medium
--detect-suicidal	Detect suicidal functions	High	High
--detect-uninitialized-state	Detect uninitialized state variables	High	High
--detect-uninitialized-storage	Detect uninitialized storage variables	High	High
--detect-locked-ether	Detect contracts with payable functions that do not send ether	Medium	High
--detect-tx-origin	Detect dangerous usage of tx.origin	Medium	Medium
--detect-pragma	Detect if different pragma directives are used	Informational	High
--detect-solc-version	Detect if an old version of Solidity used (<0.4.23)	Informational	High
--detect-unused-state	Detect unused state variables	Informational	High

Contact us to get access to additional detectors.

How to install

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

$ 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.