slither-analyzer 0.6.3

Slither is a Solidity static analysis framework written in Python 3.

# Slither, the Solidity source analyzer <img src=”./logo.png” alt=”Logo” width=”500”/>

[](https://travis-ci.com/crytic/slither) [](https://empireslacking.herokuapp.com) [](https://badge.fury.io/py/slither-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

• Easily integrates into continuous integration and Truffle builds

• 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](https://github.com/trailofbits/slither/wiki/SlithIR)) enables simple, high-precision analyses

• Correctly parses 99.9% of all public Solidity code

• Average execution time of less than 1 second per contract

## Usage

Run Slither on a Truffle/Embark/Dapp/Etherlime application: ` slither . `

Run Slither on a single file: ` $ slither tests/uninitialized.sol `

For additional configuration, see the [usage](https://github.com/trailofbits/slither/wiki/Usage) documentation.

## Detectors

By default, all the detectors are run.

Num | Detector | What it Detects | Impact | Confidence — | — | — | — | — 1 | rtlo | [Right-To-Left-Override control character is used](https://github.com/crytic/slither/wiki/Detector-Documentation#right-to-left-override-character) | High | High 2 | shadowing-state | [State variables shadowing](https://github.com/crytic/slither/wiki/Detector-Documentation#state-variable-shadowing) | High | High 3 | suicidal | [Functions allowing anyone to destruct the contract](https://github.com/crytic/slither/wiki/Detector-Documentation#suicidal) | High | High 4 | uninitialized-state | [Uninitialized state variables](https://github.com/crytic/slither/wiki/Detector-Documentation#uninitialized-state-variables) | High | High 5 | uninitialized-storage | [Uninitialized storage variables](https://github.com/crytic/slither/wiki/Detector-Documentation#uninitialized-storage-variables) | High | High 6 | arbitrary-send | [Functions that send ether to arbitrary destinations](https://github.com/crytic/slither/wiki/Detector-Documentation#functions-that-send-ether-to-arbitrary-destinations) | High | Medium 7 | controlled-delegatecall | [Controlled delegatecall destination](https://github.com/crytic/slither/wiki/Detector-Documentation#controlled-delegatecall) | High | Medium 8 | reentrancy-eth | [Reentrancy vulnerabilities (theft of ethers)](https://github.com/crytic/slither/wiki/Detector-Documentation#reentrancy-vulnerabilities) | High | Medium 9 | erc20-interface | [Incorrect ERC20 interfaces](https://github.com/crytic/slither/wiki/Detector-Documentation#incorrect-erc20-interface) | Medium | High 10 | incorrect-equality | [Dangerous strict equalities](https://github.com/crytic/slither/wiki/Detector-Documentation#dangerous-strict-equalities) | Medium | High 11 | locked-ether | [Contracts that lock ether](https://github.com/crytic/slither/wiki/Detector-Documentation#contracts-that-lock-ether) | Medium | High 12 | shadowing-abstract | [State variables shadowing from abstract contracts](https://github.com/crytic/slither/wiki/Detector-Documentation#state-variable-shadowing-from-abstract-contracts) | Medium | High 13 | constant-function | [Constant functions changing the state](https://github.com/crytic/slither/wiki/Detector-Documentation#constant-functions-changing-the-state) | Medium | Medium 14 | reentrancy-no-eth | [Reentrancy vulnerabilities (no theft of ethers)](https://github.com/crytic/slither/wiki/Detector-Documentation#reentrancy-vulnerabilities-1) | Medium | Medium 15 | tx-origin | [Dangerous usage of tx.origin](https://github.com/crytic/slither/wiki/Detector-Documentation#dangerous-usage-of-txorigin) | Medium | Medium 16 | uninitialized-local | [Uninitialized local variables](https://github.com/crytic/slither/wiki/Detector-Documentation#uninitialized-local-variables) | Medium | Medium 17 | unused-return | [Unused return values](https://github.com/crytic/slither/wiki/Detector-Documentation#unused-return) | Medium | Medium 18 | shadowing-builtin | [Built-in symbol shadowing](https://github.com/crytic/slither/wiki/Detector-Documentation#builtin-symbol-shadowing) | Low | High 19 | shadowing-local | [Local variables shadowing](https://github.com/crytic/slither/wiki/Detector-Documentation#local-variable-shadowing) | Low | High 20 | calls-loop | [Multiple calls in a loop](https://github.com/crytic/slither/wiki/Detector-Documentation/_edit#calls-inside-a-loop) | Low | Medium 21 | reentrancy-benign | [Benign reentrancy vulnerabilities](https://github.com/crytic/slither/wiki/Detector-Documentation#reentrancy-vulnerabilities-2) | Low | Medium 22 | timestamp | [Dangerous usage of block.timestamp](https://github.com/crytic/slither/wiki/Detector-Documentation#block-timestamp) | Low | Medium 23 | assembly | [Assembly usage](https://github.com/crytic/slither/wiki/Detector-Documentation#assembly-usage) | Informational | High 24 | constable-states | [State variables that could be declared constant](https://github.com/crytic/slither/wiki/Detector-Documentation#state-variables-that-could-be-declared-constant) | Informational | High 25 | deprecated-standards | [Deprecated Solidity Standards](https://github.com/crytic/slither/wiki/Detector-Documentation#deprecated-standards) | Informational | High 26 | erc20-indexed | [Un-indexed ERC20 event parameters](https://github.com/crytic/slither/wiki/Detector-Documentation#unindexed-erc20-event-parameters) | Informational | High 27 | external-function | [Public function that could be declared as external](https://github.com/crytic/slither/wiki/Detector-Documentation#public-function-that-could-be-declared-as-external) | Informational | High 28 | low-level-calls | [Low level calls](https://github.com/crytic/slither/wiki/Detector-Documentation#low-level-calls) | Informational | High 29 | naming-convention | [Conformance to Solidity naming conventions](https://github.com/crytic/slither/wiki/Detector-Documentation#conformance-to-solidity-naming-conventions) | Informational | High 30 | pragma | [If different pragma directives are used](https://github.com/crytic/slither/wiki/Detector-Documentation#different-pragma-directives-are-used) | Informational | High 31 | solc-version | [Incorrect Solidity version (< 0.4.24 or complex pragma)](https://github.com/crytic/slither/wiki/Detector-Documentation#incorrect-version-of-solidity) | Informational | High 32 | unused-state | [Unused state variables](https://github.com/crytic/slither/wiki/Detector-Documentation#unused-state-variables) | Informational | High

[Contact us](https://www.trailofbits.com/contact/) to get access to additional detectors.

### Printers

To run a printer, use –print and a comma-separated list of printers.

Num | Printer | Description — | — | — 1 | call-graph | [Export the call-graph of the contracts to a dot file](https://github.com/trailofbits/slither/wiki/Printer-documentation#call-graph) 2 | cfg | [Export the CFG of each functions](https://github.com/trailofbits/slither/wiki/Printer-documentation#cfg) 3 | contract-summary | [Print a summary of the contracts](https://github.com/trailofbits/slither/wiki/Printer-documentation#contract-summary) 4 | data-dependency | [Print the data dependencies of the variables](https://github.com/trailofbits/slither/wiki/Printer-documentation#data-dependencies) 5 | function-id | [Print the keccack256 signature of the functions](https://github.com/trailofbits/slither/wiki/Printer-documentation#function-id) 6 | function-summary | [Print a summary of the functions](https://github.com/trailofbits/slither/wiki/Printer-documentation#function-summary) 7 | human-summary | [Print a human-readable summary of the contracts](https://github.com/trailofbits/slither/wiki/Printer-documentation#human-summary) 8 | inheritance | [Print the inheritance relations between contracts](https://github.com/trailofbits/slither/wiki/Printer-documentation#inheritance) 9 | inheritance-graph | [Export the inheritance graph of each contract to a dot file](https://github.com/trailofbits/slither/wiki/Printer-documentation#inheritance-graph) 10 | modifiers | [Print the modifiers called by each function](https://github.com/trailofbits/slither/wiki/Printer-documentation#modifiers) 11 | require | [Print the require and assert calls of each function](https://github.com/trailofbits/slither/wiki/Printer-documentation#require) 12 | slithir | [Print the slithIR representation of the functions](https://github.com/trailofbits/slither/wiki/Printer-documentation#slithir) 13 | slithir-ssa | [Print the slithIR representation of the functions](https://github.com/trailofbits/slither/wiki/Printer-documentation#slithir-ssa) 14 | variable-order | [Print the storage order of the state variables](https://github.com/trailofbits/slither/wiki/Printer-documentation#variable-order) 15 | vars-and-auth | [Print the state variables written and the authorization of the functions](https://github.com/trailofbits/slither/wiki/Printer-documentation#variables-written-and-authorization)

## How to install

Slither requires Python 3.6+ and [solc](https://github.com/ethereum/solidity/), the Solidity compiler.

### Using Pip

` $ pip install slither-analyzer `

### Using Git

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

We recommend using an Python virtual environment, as detailed in the [Developer Installation Instructions](https://github.com/trailofbits/slither/wiki/Developer-installation), if you prefer to install Slither via git.

### Using Docker

Use the [eth-security-toolbox](https://github.com/trailofbits/eth-security-toolbox/) docker image. It includes all of our security tools and every major version of Solidity in a single image. /home/share will be mounted to /share in the container. Use [solc-select](https://github.com/trailofbits/eth-security-toolbox/#usage) to switch the Solidity version.

` docker pull trailofbits/eth-security-toolbox `

To share a directory in the container:

` docker run -it -v /home/share:/share trailofbits/eth-security-toolbox `

## Getting Help

Feel free to stop by our [Slack channel](https://empireslacking.herokuapp.com) (#ethereum) for help using or extending Slither.

• The [Printer documentation](https://github.com/trailofbits/slither/wiki/Printer-documentation) describes the information Slither is capable of visualizing for each contract.

• The [Detector documentation](https://github.com/trailofbits/slither/wiki/Adding-a-new-detector) describes how to write a new vulnerability analyses.

• The [API documentation](https://github.com/trailofbits/slither/wiki/API-examples) describes the methods and objects available for custom analyses.

• The [SlithIR documentation](https://github.com/trailofbits/slither/wiki/SlithIR) describes the SlithIR intermediate representation.

## License

Slither is licensed and distributed under the AGPLv3 license. [Contact us](mailto:[e-mail]) if you’re looking for an exception to the terms.