# Integer Overflow or Wraparound (CWE-190)

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.

**Stack:** Go

- Prevalence: 보통 3개 언어 지원
- Impact: 보통 검토 권장
- Prevention: 문서화됨 3개의 수정 예시

**OWASP:** Security Misconfiguration (A05:2021-Security Misconfiguration) - #5

## Description

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.

## Prevention

1개의 Shoulder 탐지 규칙을 기반으로 한 Integer Overflow 예방 전략.

### Go

Validate bounds before arithmetic operations with user-controlled integers

## Consequences

- DoS
- 승인되지 않은 코드 실행
- 애플리케이션 데이터 수정

## Mitigations

- 정수 오버플로를 검사하는 언어나 라이브러리를 사용하세요
- 입력이 예상되는 범위 내에 있는지 검증하세요
- 오버플로를 검사하는 안전한 산술 함수를 사용하세요

## Detection

- Total rules: 3
- Languages: go, javascript, typescript, python

## Rules by Language

### Go (1 rules)

- **Integer Overflow via Unchecked Arithmetic** [MEDIUM]: User-controlled integer used in arithmetic or allocation without bounds checking.
  - Remediation: Validate bounds before arithmetic operations with user input.

```go
count, err := strconv.Atoi(r.URL.Query().Get("count"))
if err != nil || count < 0 || count > 10000 {
    return errors.New("invalid count")
}
buffer := make([]byte, count*1024)
```

Learn more: https://shoulder.dev/learn/go/cwe-190/integer-overflow