Integer Overflow or Wraparound (CWE-190)

Integer Overflow or Wraparound

The product performs a calculation that can produce an integer overflow or wraparound, when the logic assumes that the resulting value will always be larger than the original value.

An integer overflow occurs when an arithmetic operation attempts to create a numeric value that is outside of the range that can be represented with a given number of bits. This can lead to buffer overflows, incorrect financial calculations, or security bypasses.

Prevalência

Média

3 linguagens cobertas

Impacto

Médio

Revisão recomendada

Prevenção

Documentada

3 exemplos de correção

2 Prevenção

Como corrigir esta vulnerabilidade

Estratégias de prevenção para Integer Overflow baseadas em 3 regras de detecção do Shoulder.

🐹 Go Ver tudo Go detalhes →

Integer Overflow via Unchecked Arithmetic MEDIUM

Validate bounds before arithmetic operations with user-controlled integers

+5 -1 go

  func handler(w http.ResponseWriter, r *http.Request) {
-     count, _ := strconv.Atoi(r.URL.Query().Get("count"))
+     count, err := strconv.Atoi(r.URL.Query().Get("count"))
+     if err != nil || count < 0 || count > 10000 {
+         http.Error(w, "Invalid count", 400)
+         return
+     }
      buffer := make([]byte, count*1024)
  }

🟨 JavaScript Ver tudo JavaScript detalhes →

Integer Overflow via Unchecked Arithmetic MEDIUM

Validate numeric bounds before using user input in allocations or arithmetic

+5 -1 javascript

- const size = parseInt(req.query.size, 10);
+ const MAX_SIZE = 1024 * 1024;
+ const size = parseInt(req.query.size, 10);
+ if (isNaN(size) || size < 0 || size > MAX_SIZE) {
+   return res.status(400).json({ error: 'Invalid size' });
+ }
  const buffer = Buffer.alloc(size);

🐍 Python Ver tudo Python detalhes →

Integer Overflow / Large Number Handling LOW

Validate numeric bounds before arithmetic operations on user input

+9 -7 python

- from flask import request
- 
- @app.route('/calculate')
- def calculate():
-     count = int(request.args.get('count'))
-     total = count * unit_price
-     return {'total': total}
+ from flask import request, jsonify
+ 
+ @app.route('/calculate')
+ def calculate():
+     count = int(request.args.get('count', 0))
+     if count < 0 or count > 10000:
+         return jsonify({'error': 'Invalid count'}), 400
+     total = count * unit_price
+     return jsonify({'total': total})

3 Detecção

Encontre vulnerabilidades no seu código

Use o Shoulder para escanear seu código em busca de padrões Integer Overflow or Wraparound. 3 regras.

terminal

# Scan with Shoulder CLI
npx @shoulderdev/cli trust --cwe=190

# Or scan entire project
npx @shoulderdev/cli trust .

Regras de Detecção (3)

🐹 Go 1 rules

Integer Overflow via Unchecked Arithmetic MEDIUM

User-controlled integer used in arithmetic or allocation without bounds checking.

🟨 Javascript 1 rules

Integer Overflow via Unchecked Arithmetic MEDIUM

Detects user-controlled values flowing into arithmetic operations without bounds checking. While JavaScript uses 64-bit floats for most numbers, integer overflow is still a concern in these scenarios: 1. TypedArrays (Uint8Array, Int32Array, etc.) - values wrap on overflow 2. Bitwise operations - convert to 32-bit signed integers 3. Large number arithmetic affecting security decisions 4. Array/Buffer allocation with user-controlled sizes Common vulnerable patterns: - Buffer allocation: Buffer.a

🔷 Typescript 1 rules

Integer Overflow via Unchecked Arithmetic MEDIUM

🐍 Python 1 rules

Integer Overflow / Large Number Handling LOW

Detects potential integer overflow in numeric operations.

4 Sinais de Alerta

O que observar nas revisões de código

Estes padrões indicam vulnerabilidades potenciais de Integer Overflow or Wraparound. Procure-os durante revisões de código e auditorias de segurança.

🟡

user-controlled values flowing into arithmetic operations without bounds checking javascript-integer-overflow

🔵

potential integer overflow in numeric operations python-integer-overflow

🔍

Escaneie seu código para Integer Overflow or Wraparound

O Shoulder CLI encontra padrões vulneráveis em todo o seu código.

npx shoulder trust Ver todas as regras