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96 lines
4.8 KiB
Markdown
96 lines
4.8 KiB
Markdown
# Integer Overflow
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<details>
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<summary><strong>Learn AWS hacking from zero to hero with</strong> <a href="https://training.hacktricks.xyz/courses/arte"><strong>htARTE (HackTricks AWS Red Team Expert)</strong></a><strong>!</strong></summary>
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* Do you work in a **cybersecurity company**? Do you want to see your **company advertised in HackTricks**? or do you want to have access to the **latest version of the PEASS or download HackTricks in PDF**? Check the [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop)!
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* Discover [**The PEASS Family**](https://opensea.io/collection/the-peass-family), our collection of exclusive [**NFTs**](https://opensea.io/collection/the-peass-family)
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* Get the [**official PEASS & HackTricks swag**](https://peass.creator-spring.com)
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* **Join the** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) or the [**telegram group**](https://t.me/peass) or **follow** me on **Twitter** 🐦[**@carlospolopm**](https://twitter.com/hacktricks_live)**.**
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* **Share your hacking tricks by submitting PRs to the [hacktricks repo](https://github.com/carlospolop/hacktricks) and [hacktricks-cloud repo](https://github.com/carlospolop/hacktricks-cloud)**.
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</details>
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{% tabs %}
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{% tab title="Rust" %}
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```rust
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fn main() {
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let mut quantity = 2147483647;
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let (mul_result, _) = i32::overflowing_mul(32767, quantity);
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let (add_result, _) = i32::overflowing_add(1, quantity);
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println!("{}", mul_result);
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println!("{}", add_result);
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}
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```
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{% endtab %}
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{% tab title="Klingon" %}
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{% endtab %}
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{% endtabs %}
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## Integer Overflow
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An integer overflow occurs when an arithmetic operation results in a value that exceeds the maximum representable value for that data type. This can lead to unexpected behavior and security vulnerabilities in software.
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In the context of web application security, integer overflow vulnerabilities can be exploited to bypass security controls, manipulate data, or even execute arbitrary code.
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### How Integer Overflow Works
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Integer overflow typically occurs when a mathematical operation, such as addition or multiplication, is performed on two integers and the result exceeds the maximum value that can be represented by the data type.
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For example, consider a 32-bit signed integer data type. The maximum value that can be represented is 2,147,483,647. If an addition operation is performed on two integers that result in a value greater than this maximum, an integer overflow occurs.
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### Exploiting Integer Overflow
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Exploiting an integer overflow vulnerability involves manipulating the input data in such a way that it triggers an overflow condition. This can be achieved by providing input values that cause the arithmetic operation to result in a value greater than the maximum representable value.
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Once an integer overflow occurs, the behavior of the software can become unpredictable. This can be leveraged by an attacker to gain unauthorized access, bypass security controls, or execute arbitrary code.
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### Mitigating Integer Overflow Vulnerabilities
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To mitigate integer overflow vulnerabilities, it is important to:
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- Use data types that can accommodate the expected range of values.
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- Validate and sanitize user input to prevent malicious input from triggering an overflow condition.
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- Implement bounds checking to ensure that arithmetic operations do not result in values that exceed the maximum representable value.
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- Regularly update and patch software to address any known vulnerabilities.
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By following these best practices, developers can reduce the risk of integer overflow vulnerabilities in their software.
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```c
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#include <stdio.h>
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#include <limits.h>
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int main() {
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int a = INT_MAX;
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int b = 0;
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int c = 0;
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b = a * 100;
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c = a + 1;
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printf("%d\n", INT_MAX);
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printf("%d\n", b);
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printf("%d\n", c);
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return 0;
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}
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```
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{% endtab %}
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{% endtabs %}
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<details>
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<summary><strong>qaStaHvIS AWS hacking vItlhutlh</strong> <a href="https://training.hacktricks.xyz/courses/arte"><strong>htARTE (HackTricks AWS Red Team Expert)</strong></a><strong>!</strong></summary>
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* **qaStaHvIS** **cybersecurity company** vItlhutlh? **HackTricks** **company advertised** **want**? **PEASS latest version** **download HackTricks PDF** **want**? [**SUBSCRIPTION PLANS**](https://github.com/sponsors/carlospolop) **check**!
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* [**The PEASS Family**](https://opensea.io/collection/the-peass-family) **Discover**, **exclusive NFTs** **collection** **our**.
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* [**official PEASS & HackTricks swag**](https://peass.creator-spring.com) **Get**.
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* **Join** [**💬**](https://emojipedia.org/speech-balloon/) [**Discord group**](https://discord.gg/hRep4RUj7f) **telegram group** **or** **follow** **me** **Twitter** 🐦[**@carlospolopm**](https://twitter.com/hacktricks_live)**.**
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* **Share** **hacking tricks** **hacktricks repo** **hacktricks-cloud repo** **submitting PRs**.
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</details>
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