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About the developer

crytic
1.7K Stars 333 Forks GNU Affero General Public License v3.0 2.4K Commits 244 Opened issues

Description

Static Analyzer for Solidity

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Slither, the Solidity source analyzer

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Build Status Slack Status PyPI version

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 comprehension, and quickly prototype custom analyses.

Features

  • Detects vulnerable Solidity code with low false positives (see the list of trophies)
  • 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

Bugs and Optimizations Detection

Run Slither on a Truffle/Embark/Dapp/Etherlime/Hardhat application:

bash
slither .

Run Slither on a single file:

bash
slither tests/uninitialized.sol

For additional configuration, see the usage documentation.

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

Detectors

Num

Detector What it Detects Impact Confidence
1

abiencoderv2-array
Storage abiencoderv2 array High High
2
array-by-reference
Modifying storage array by value High High
3
incorrect-shift
The order of parameters in a shift instruction is incorrect. High High
4
multiple-constructors
Multiple constructor schemes High High
5
name-reused
Contract's name reused High High
6
public-mappings-nested
Public mappings with nested variables High High
7
rtlo
Right-To-Left-Override control character is used High High
8
shadowing-state
State variables shadowing High High
9
suicidal
Functions allowing anyone to destruct the contract High High
10
uninitialized-state
Uninitialized state variables High High
11
uninitialized-storage
Uninitialized storage variables High High
12
unprotected-upgrade
Unprotected upgradeable contract High High
13
arbitrary-send
Functions that send Ether to arbitrary destinations High Medium
14
controlled-array-length
Tainted array length assignment High Medium
15
controlled-delegatecall
Controlled delegatecall destination High Medium
16
delegatecall-loop
Payable functions using
delegatecall
inside a loop
High Medium
17
msg-value-loop
msg.value inside a loop High Medium
18
reentrancy-eth
Reentrancy vulnerabilities (theft of ethers) High Medium
19
storage-array
Signed storage integer array compiler bug High Medium
20
unchecked-transfer
Unchecked tokens transfer High Medium
21
weak-prng
Weak PRNG High Medium
22
enum-conversion
Detect dangerous enum conversion Medium High
23
erc20-interface
Incorrect ERC20 interfaces Medium High
24
erc721-interface
Incorrect ERC721 interfaces Medium High
25
incorrect-equality
Dangerous strict equalities Medium High
26
locked-ether
Contracts that lock ether Medium High
27
mapping-deletion
Deletion on mapping containing a structure Medium High
28
shadowing-abstract
State variables shadowing from abstract contracts Medium High
29
tautology
Tautology or contradiction Medium High
30
write-after-write
Unused write Medium High
31
boolean-cst
Misuse of Boolean constant Medium Medium
32
constant-function-asm
Constant functions using assembly code Medium Medium
33
constant-function-state
Constant functions changing the state Medium Medium
34
divide-before-multiply
Imprecise arithmetic operations order Medium Medium
35
reentrancy-no-eth
Reentrancy vulnerabilities (no theft of ethers) Medium Medium
36
reused-constructor
Reused base constructor Medium Medium
37
tx-origin
Dangerous usage of
tx.origin
Medium Medium
38
unchecked-lowlevel
Unchecked low-level calls Medium Medium
39
unchecked-send
Unchecked send Medium Medium
40
uninitialized-local
Uninitialized local variables Medium Medium
41
unused-return
Unused return values Medium Medium
42
incorrect-modifier
Modifiers that can return the default value Low High
43
shadowing-builtin
Built-in symbol shadowing Low High
44
shadowing-local
Local variables shadowing Low High
45
uninitialized-fptr-cst
Uninitialized function pointer calls in constructors Low High
46
variable-scope
Local variables used prior their declaration Low High
47
void-cst
Constructor called not implemented Low High
48
calls-loop
Multiple calls in a loop Low Medium
49
events-access
Missing Events Access Control Low Medium
50
events-maths
Missing Events Arithmetic Low Medium
51
incorrect-unary
Dangerous unary expressions Low Medium
52
missing-zero-check
Missing Zero Address Validation Low Medium
53
reentrancy-benign
Benign reentrancy vulnerabilities Low Medium
54
reentrancy-events
Reentrancy vulnerabilities leading to out-of-order Events Low Medium
55
timestamp
Dangerous usage of
block.timestamp
Low Medium
56
assembly
Assembly usage Informational High
57
assert-state-change
Assert state change Informational High
58
boolean-equal
Comparison to boolean constant Informational High
59
deprecated-standards
Deprecated Solidity Standards Informational High
60
erc20-indexed
Un-indexed ERC20 event parameters Informational High
61
function-init-state
Function initializing state variables Informational High
62
low-level-calls
Low level calls Informational High
63
missing-inheritance
Missing inheritance Informational High
64
naming-convention
Conformity to Solidity naming conventions Informational High
65
pragma
If different pragma directives are used Informational High
66
redundant-statements
Redundant statements Informational High
67
solc-version
Incorrect Solidity version Informational High
68
unimplemented-functions
Unimplemented functions Informational High
69
unused-state
Unused state variables Informational High
70
costly-loop
Costly operations in a loop Informational Medium
71
dead-code
Functions that are not used Informational Medium
72
reentrancy-unlimited-gas
Reentrancy vulnerabilities through send and transfer Informational Medium
73
similar-names
Variable names are too similar Informational Medium
74
too-many-digits
Conformance to numeric notation best practices Informational Medium
75
constable-states
State variables that could be declared constant Optimization High
76
external-function
Public function that could be declared external Optimization High

For more information, see - The Detector Documentation for details on each detector - The Detection Selection to run only selected detectors. By default, all the detectors are run. - The Triage Mode to filter individual results

Printers

Quick Review Printers

In-Depth Review Printers

To run a printer, use

--print
and a comma-separated list of printers.

See the Printer documentation for the complete lists.

Tools

See the Tool documentation for additional tools.

Contact us to get help on building custom tools.

How to install

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

Using Pip

pip3 install slither-analyzer

Using Git

git clone https://github.com/crytic/slither.git && cd slither
python3 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.
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 (#ethereum) for help using or extending Slither.

License

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

Publications

Trail of Bits publication

External publications

Title

Usage Authors Venue
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 Leverage data dependency through Slither William Zhang, Sebastian Banescu, Leodardo Pasos, Steven Stewart, Vijay Ganesh ISSRE 2019
ETHPLOIT: From Fuzzing to Efficient Exploit Generation against Smart Contracts Leverage data dependency through Slither Qingzhao Zhang, Yizhuo Wang, Juanru Li, Siqi Ma SANER 20
Verification of Ethereum Smart Contracts: A Model Checking Approach Symbolic execution built on top of Slither’s CFG Tam Bang, Hoang H Nguyen, Dung Nguyen, Toan Trieu, Tho Quan IJMLC 20
Smart Contract Repair Rely on Slither’s vulnerabilities detectors Xiao Liang Yu, Omar Al-Bataineh, David Lo, Abhik Roychoudhury TOSEM 20
Demystifying Loops in Smart Contracts 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 Use Slither’s CFG to detect loops Chunmiao Li, Shijie Nie, Yang Cao, Yijun Yu, Zhenjiang Hu IEEE Open J. Comput. Soc. 1 (2020)

If you are using Slither on an academic work, consider applying to the Crytic $10k Research Prize.

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