Slither is a Solidity static analysis framework written in Python3. 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 comprehension, and quickly prototype custom analyses.
- [Features](#features)
- [Bugs and Optimizations Detection](#bugs-and-optimizations-detection)
- [Usage](#usage)
- [How to Install](#how-to-install)
- [Detectors](#detectors)
- [Printers](#printers)
- [Tools](#tools)
- [How to Install](#how-to-install)
- [API Documentation](#api-documentation)
- [Getting Help](#getting-help)
- [FAQ](#faq)
- [Publications](#publications)
@ -20,35 +22,68 @@ Slither is a Solidity static analysis framework written in Python 3. It runs a s
* Detects vulnerable Solidity code with low false positives (see the list of [trophies](./trophies.md))
* Identifies where the error condition occurs in the source code
* Easily integrates into continuous integration and Truffle builds
* Easily integrates into continuous integration and Hardhat/Foundry 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
* Correctly parses 99.9% of all public Solidity code
* Average execution time of less than 1 second per contract
* Integrates with Github's code scanning in [CI](https://github.com/marketplace/actions/slither-action)
## Usage
## Bugs and Optimizations Detection
Run Slither on a Truffle/Embark/Dapp/Etherlime/Hardhat application:
Run Slither on a Hardhat/Foundry/Dapp/Brownie application:
```bash
slither .
```
This is the preferred option if your project has dependencies as Slither relies on the underlying compilation framework to compile source code.
Run Slither on a single file:
However, you can run Slither on a single file that does not import dependencies:
```bash
slither tests/uninitialized.sol
```
## How to install
Slither requires Python 3.8+.
If you're **not** going to use one of the [supported compilation frameworks](https://github.com/crytic/crytic-compile), you need [solc](https://github.com/ethereum/solidity/), the Solidity compiler; we recommend using [solc-select](https://github.com/crytic/solc-select) to conveniently switch between solc versions.
### Using Pip
```bash
pip3 install slither-analyzer
```
### Using Git
```bash
git clone https://github.com/crytic/slither.git && cd slither
python3 setup.py install
```
We recommend using a 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.
```bash
docker pull trailofbits/eth-security-toolbox
```
To share a directory in the container:
```bash
docker run -it -v /home/share:/share trailofbits/eth-security-toolbox
```
### Integration
- For GitHub action integration, use [slither-action](https://github.com/marketplace/actions/slither-action).
- To generate a Markdown report, use `slither [target] --checklist`.
- To generate a Markdown with GitHub source code highlighting, use `slither [target] --checklist --markdown-root https://github.com/ORG/REPO/blob/COMMIT/` (replace `ORG`, `REPO`, `COMMIT`)
Use [solc-select](https://github.com/crytic/solc-select) if your contracts require older versions of solc. For additional configuration, see the [usage](https://github.com/trailofbits/slither/wiki/Usage) documentation.
### Detectors
## Detectors
Num | Detector | What it Detects | Impact | Confidence
@ -116,26 +151,27 @@ Num | Detector | What it Detects | Impact | Confidence
61 | `assembly` | [Assembly usage](https://github.com/crytic/slither/wiki/Detector-Documentation#assembly-usage) | Informational | High
62 | `assert-state-change` | [Assert state change](https://github.com/crytic/slither/wiki/Detector-Documentation#assert-state-change) | Informational | High
63 | `boolean-equal` | [Comparison to boolean constant](https://github.com/crytic/slither/wiki/Detector-Documentation#boolean-equality) | Informational | High
68 | `missing-inheritance` | [Missing inheritance](https://github.com/crytic/slither/wiki/Detector-Documentation#missing-inheritance) | Informational | High
69 | `naming-convention` | [Conformity to Solidity naming conventions](https://github.com/crytic/slither/wiki/Detector-Documentation#conformance-to-solidity-naming-conventions) | Informational | High
70 | `pragma` | [If different pragma directives are used](https://github.com/crytic/slither/wiki/Detector-Documentation#different-pragma-directives-are-used) | Informational | High
71 | `redundant-statements` | [Redundant statements](https://github.com/crytic/slither/wiki/Detector-Documentation#redundant-statements) | Informational | High
73 | `unimplemented-functions` | [Unimplemented functions](https://github.com/crytic/slither/wiki/Detector-Documentation#unimplemented-functions) | Informational | High
74 | `unused-state` | [Unused state variables](https://github.com/crytic/slither/wiki/Detector-Documentation#unused-state-variable) | Informational | High
75 | `costly-loop` | [Costly operations in a loop](https://github.com/crytic/slither/wiki/Detector-Documentation#costly-operations-inside-a-loop) | Informational | Medium
76 | `dead-code` | [Functions that are not used](https://github.com/crytic/slither/wiki/Detector-Documentation#dead-code) | Informational | Medium
77 | `reentrancy-unlimited-gas` | [Reentrancy vulnerabilities through send and transfer](https://github.com/crytic/slither/wiki/Detector-Documentation#reentrancy-vulnerabilities-4) | Informational | Medium
78 | `similar-names` | [Variable names are too similar](https://github.com/crytic/slither/wiki/Detector-Documentation#variable-names-too-similar) | Informational | Medium
79 | `too-many-digits` | [Conformance to numeric notation best practices](https://github.com/crytic/slither/wiki/Detector-Documentation#too-many-digits) | Informational | Medium
80 | `constable-states` | [State variables that could be declared constant](https://github.com/crytic/slither/wiki/Detector-Documentation#state-variables-that-could-be-declared-constant) | Optimization | High
81 | `external-function` | [Public function that could be declared external](https://github.com/crytic/slither/wiki/Detector-Documentation#public-function-that-could-be-declared-external) | Optimization | High
82 | `immutable-states` | [State variables that could be declared immutable](https://github.com/crytic/slither/wiki/Detector-Documentation#state-variables-that-could-be-declared-immutable) | Optimization | High
83 | `var-read-using-this` | [Contract reads its own variable using `this`](https://github.com/crytic/slither/wiki/Vulnerabilities-Description#public-variable-read-in-external-context) | Optimization | High
64 | `cyclomatic-complexity` | [Detects functions with high (> 11) cyclomatic complexity](https://github.com/crytic/slither/wiki/Detector-Documentation#cyclomatic-complexity) | Informational | High
69 | `missing-inheritance` | [Missing inheritance](https://github.com/crytic/slither/wiki/Detector-Documentation#missing-inheritance) | Informational | High
70 | `naming-convention` | [Conformity to Solidity naming conventions](https://github.com/crytic/slither/wiki/Detector-Documentation#conformance-to-solidity-naming-conventions) | Informational | High
71 | `pragma` | [If different pragma directives are used](https://github.com/crytic/slither/wiki/Detector-Documentation#different-pragma-directives-are-used) | Informational | High
72 | `redundant-statements` | [Redundant statements](https://github.com/crytic/slither/wiki/Detector-Documentation#redundant-statements) | Informational | High
74 | `unimplemented-functions` | [Unimplemented functions](https://github.com/crytic/slither/wiki/Detector-Documentation#unimplemented-functions) | Informational | High
75 | `unused-state` | [Unused state variables](https://github.com/crytic/slither/wiki/Detector-Documentation#unused-state-variable) | Informational | High
76 | `costly-loop` | [Costly operations in a loop](https://github.com/crytic/slither/wiki/Detector-Documentation#costly-operations-inside-a-loop) | Informational | Medium
77 | `dead-code` | [Functions that are not used](https://github.com/crytic/slither/wiki/Detector-Documentation#dead-code) | Informational | Medium
78 | `reentrancy-unlimited-gas` | [Reentrancy vulnerabilities through send and transfer](https://github.com/crytic/slither/wiki/Detector-Documentation#reentrancy-vulnerabilities-4) | Informational | Medium
79 | `similar-names` | [Variable names are too similar](https://github.com/crytic/slither/wiki/Detector-Documentation#variable-names-too-similar) | Informational | Medium
80 | `too-many-digits` | [Conformance to numeric notation best practices](https://github.com/crytic/slither/wiki/Detector-Documentation#too-many-digits) | Informational | Medium
81 | `constable-states` | [State variables that could be declared constant](https://github.com/crytic/slither/wiki/Detector-Documentation#state-variables-that-could-be-declared-constant) | Optimization | High
82 | `external-function` | [Public function that could be declared external](https://github.com/crytic/slither/wiki/Detector-Documentation#public-function-that-could-be-declared-external) | Optimization | High
83 | `immutable-states` | [State variables that could be declared immutable](https://github.com/crytic/slither/wiki/Detector-Documentation#state-variables-that-could-be-declared-immutable) | Optimization | High
84 | `var-read-using-this` | [Contract reads its own variable using `this`](https://github.com/crytic/slither/wiki/Vulnerabilities-Description#public-variable-read-in-external-context) | Optimization | High
For more information, see
- The [Detector Documentation](https://github.com/crytic/slither/wiki/Detector-Documentation) for details on each detector
@ -173,40 +209,8 @@ See the [Tool documentation](https://github.com/crytic/slither/wiki/Tool-Documen
[Contact us](https://www.trailofbits.com/contact/) to get help on building custom tools.
## How to install
Slither requires Python 3.8+.
If you're **not** going to use one of the [supported compilation frameworks](https://github.com/crytic/crytic-compile),
you need to have on your machine the right version of [solc](https://github.com/ethereum/solidity/), the Solidity compiler.
### Using Pip
```bash
pip3 install slither-analyzer
```
### Using Git
```bash
git clone https://github.com/crytic/slither.git && cd slither
python3 setup.py install
```
We recommend using a 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.
```bash
docker pull trailofbits/eth-security-toolbox
```
To share a directory in the container:
```bash
docker run -it -v /home/share:/share trailofbits/eth-security-toolbox
```
## API Documentation
Documentation on Slither's internals is available [here](https://crytic.github.io/slither/slither.html).
## Getting Help
@ -243,17 +247,19 @@ Slither is licensed and distributed under the AGPLv3 license. [Contact us](mailt
- [Slither: A Static Analysis Framework For Smart Contracts](https://arxiv.org/abs/1908.09878), Josselin Feist, Gustavo Grieco, Alex Groce - WETSEB '19
### External publications
Title | Usage | Authors | Venue
--- | --- | --- | ---
Title | Usage | Authors | Venue | Code
--- | --- | --- | --- | ---
[ReJection: A AST-Based Reentrancy Vulnerability Detection Method](https://www.researchgate.net/publication/339354823_ReJection_A_AST-Based_Reentrancy_Vulnerability_Detection_Method) | AST-based analysis built on top of Slither | Rui Ma, Zefeng Jian, Guangyuan Chen, Ke Ma, Yujia Chen | CTCIS 19
[MPro: Combining Static and Symbolic Analysis forScalable Testing of Smart Contract](https://arxiv.org/pdf/1911.00570.pdf) | Leverage data dependency through Slither | William Zhang, Sebastian Banescu, Leodardo Pasos, Steven Stewart, Vijay Ganesh | ISSRE 2019
[MPro: Combining Static and Symbolic Analysis forScalable Testing of Smart Contract](https://arxiv.org/pdf/1911.00570.pdf) | Leverage data dependency through Slither | William Zhang, Sebastian Banescu, Leodardo Pasos, Steven Stewart, Vijay Ganesh | ISSRE 2019 | [MPro](https://github.com/QuanZhang-William/M-Pro)
[ETHPLOIT: From Fuzzing to Efficient Exploit Generation against Smart Contracts](https://wcventure.github.io/FuzzingPaper/Paper/SANER20_ETHPLOIT.pdf) | Leverage data dependency through Slither | Qingzhao Zhang, Yizhuo Wang, Juanru Li, Siqi Ma | SANER 20
[Verification of Ethereum Smart Contracts: A Model Checking Approach](http://www.ijmlc.org/vol10/977-AM0059.pdf) | Symbolic execution built on top of Slither’s CFG | Tam Bang, Hoang H Nguyen, Dung Nguyen, Toan Trieu, Tho Quan | IJMLC 20
[Demystifying Loops in Smart Contracts](https://www.microsoft.com/en-us/research/uploads/prod/2020/08/loops_solidity__camera_ready-5f3fec3f15c69.pdf) | Leverage data dependency through Slither | Ben Mariano, Yanju Chen, Yu Feng, Shuvendu Lahiri, Isil Dillig | ASE 20
[Trace-Based Dynamic Gas Estimation of Loops in Smart Contracts](https://ieeexplore.ieee.org/stamp/stamp.jsp?arnumber=9268144) | Use Slither’s CFG to detect loops | Chunmiao Li, Shijie Nie, Yang Cao, Yijun Yu, Zhenjiang Hu | IEEE Open J. Comput. Soc. 1 (2020)
[SAILFISH: Vetting Smart Contract State-Inconsistency Bugs in Seconds](https://arxiv.org/pdf/2104.08638.pdf) | Rely on SlithIR to build a *storage dependency graph* | Priyanka Bose, Dipanjan Das, Yanju Chen, Yu Feng, Christopher Kruegel, and Giovanni Vigna | S&P 22
[SAILFISH: Vetting Smart Contract State-Inconsistency Bugs in Seconds](https://arxiv.org/pdf/2104.08638.pdf) | Rely on SlithIR to build a *storage dependency graph* | Priyanka Bose, Dipanjan Das, Yanju Chen, Yu Feng, Christopher Kruegel, and Giovanni Vigna | S&P 22 | [Sailfish](https://github.com/ucsb-seclab/sailfish)
[SolType: Refinement Types for Arithmetic Overflow in Solidity](https://arxiv.org/abs/2110.00677) | Use Slither as frontend to build refinement type system | Bryan Tan, Benjamin Mariano, Shuvendu K. Lahiri, Isil Dillig, Yu Feng | POPL 22
[Do Not Rug on Me: Leveraging Machine Learning Techniques for Automated Scam Detection](https://www.mdpi.com/2227-7390/10/6/949) | Use Slither to extract tokens' features (mintable, pausable, ..) | Mazorra, Bruno, Victor Adan, and Vanesa Daza | Mathematics 10.6 (2022)
[MANDO: Multi-Level Heterogeneous Graph Embeddings for Fine-Grained Detection of Smart Contract Vulnerabilities](https://arxiv.org/abs/2208.13252) | Use Slither to extract the CFG and call graph | Hoang Nguyen, Nhat-Minh Nguyen, Chunyao Xie, Zahra Ahmadi, Daniel Kudendo, Thanh-Nam Doan and Lingxiao Jiang| IEEE 9th International Conference on Data Science and Advanced Analytics (DSAA, 2022) | [ge-sc](https://github.com/MANDO-Project/ge-sc)
[Automated Auditing of Price Gouging TOD Vulnerabilities in Smart Contracts](https://www.cs.toronto.edu/~fanl/papers/price-icbc22.pdf) | Use Slither to extract the CFG and data dependencies| Sidi Mohamed Beillahi, Eric Keilty, Keerthi Nelaturu, Andreas Veneris, and Fan Long | 2022 IEEE International Conference on Blockchain and Cryptocurrency (ICBC) | [Smart-Contract-Repair](https://github.com/Veneris-Group/TOD-Location-Rectification)
If you are using Slither on an academic work, consider applying to the [Crytic $10k Research Prize](https://blog.trailofbits.com/2019/11/13/announcing-the-crytic-10k-research-prize/).
@ -54,6 +58,8 @@ Additionally, the for-loop uses the variable `max`, which is declared in a previ
WIKI_RECOMMENDATION="Move all variable declarations prior to any usage of the variable, and ensure that reaching a variable declaration does not depend on some conditional if it is used unconditionally."
"description":"Uninitialized.bad().ret (tests/detectors/uninitialized-storage/0.8.19/uninitialized_storage_pointer.sol#7) is a storage variable never initialized\n",
"markdown":"[Uninitialized.bad().ret](tests/detectors/uninitialized-storage/0.8.19/uninitialized_storage_pointer.sol#L7) is a storage variable never initialized\n",
alpharush
2 years ago