Slither : Static Analyzer for Solidity

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.

It enables developers to find vulnerabilities, enhance their code comprehension, 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) 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 documentation.

Use solc-select if your contracts require older versions of solc.

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	High	High
2	`shadowing-state`	State variables shadowing	High	High
3	`suicidal`	Functions allowing anyone to destruct the contract	High	High
4	`uninitialized-state`	Uninitialized state variables	High	High
5	`uninitialized-storage`	Uninitialized storage variables	High	High
6	`arbitrary-send`	Functions that send ether to arbitrary destinations	High	Medium
7	`controlled-delegatecall`	Controlled delegatecall destination	High	Medium
8	`reentrancy-eth`	Reentrancy vulnerabilities (theft of ethers)	High	Medium
9	`erc20-interface`	Incorrect ERC20 interfaces	Medium	High
10	`erc721-interface`	Incorrect ERC721 interfaces	Medium	High
11	`incorrect-equality`	Dangerous strict equalities	Medium	High
12	`locked-ether`	Contracts that lock ether	Medium	High
13	`shadowing-abstract`	State variables shadowing from abstract contracts	Medium	High
14	`constant-function`	Constant functions changing the state	Medium	Medium
15	`reentrancy-no-eth`	Reentrancy vulnerabilities (no theft of ethers)	Medium	Medium
16	`tx-origin`	Dangerous usage of `tx.origin`	Medium	Medium
17	`unchecked-lowlevel`	Unchecked low-level calls	Medium	Medium
18	`unchecked-send`	Unchecked send	Medium	Medium
19	`uninitialized-local`	Uninitialized local variables	Medium	Medium
20	`unused-return`	Unused return values	Medium	Medium
21	`shadowing-builtin`	Built-in symbol shadowing	Low	High
22	`shadowing-local`	Local variables shadowing	Low	High
23	`void-cst`	Constructor called not implemented	Low	High
24	`calls-loop`	Multiple calls in a loop	Low	Medium
25	`reentrancy-benign`	Benign reentrancy vulnerabilities	Low	Medium
26	`timestamp`	Dangerous usage of `block.timestamp`	Low	Medium
27	`assembly`	Assembly usage	Informational	High
28	`deprecated-standards`	Deprecated Solidity Standards	Informational	High
29	`erc20-indexed`	Un-indexed ERC20 event parameters	Informational	High
30	`low-level-calls`	Low level calls	Informational	High
31	`naming-convention`	Conformance to Solidity naming conventions	Informational	High
32	`pragma`	If different pragma directives are used	Informational	High
33	`solc-version`	Incorrect Solidity version (< 0.4.24 or complex pragma)	Informational	High
34	`unused-state`	Unused state variables	Informational	High
35	`too-many-digits`	Conformance to numeric notation best practices	Informational	Medium
36	`constable-states`	State variables that could be declared constant	Optimization	High
37	`external-function`	Public function that could be declared as external	Optimization	High

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
2	`cfg`	Export the CFG of each functions
3	`constructor-calls`	Print the constructors executed
4	`contract-summary`	Print a summary of the contracts
5	`data-dependency`	Print the data dependencies of the variables
6	`echidna`	Export Echidna guiding information
7	`function-id`	Print the keccack256 signature of the functions
8	`function-summary`	Print a summary of the functions
9	`human-summary`	Print a human-readable summary of the contracts
10	`inheritance`	Print the inheritance relations between contracts
11	`inheritance-graph`	Export the inheritance graph of each contract to a dot file
12	`modifiers`	Print the modifiers called by each function
13	`require`	Print the require and assert calls of each function
14	`slithir`	Print the slithIR representation of the functions
15	`slithir-ssa`	Print the slithIR representation of the functions
16	`variable-order`	Print the storage order of the state variables
17	`vars-and-auth`	Print 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/crytic/slither.git && cd slither
$ python setup.py install

We recommend using an Python virtual environment, as detailed in the Developer Installation Instructions, if you prefer to install Slither via git.

Using Docker

Use the 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 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

Download

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