The programs do not correctly calculate the size to be used when allocating a buffer, which could lead to a buffer overflow.
Buffer Overflow attacks target improper or missing bounds checking on buffer operations, typically triggered by input injected by an attacker. As a consequence, an attacker is able to write past the boundaries of allocated buffer regions in memory, causing a program crash.
– Buffer overflows generally lead to crashes. Other attacks leading to a lack of availability are possible, including putting the program into an infinite loop.
– Access control (instruction processing): Buffer overflows often can be used to execute arbitrary code, which is usually outside the scope of a program’s implicit security policy.
– DoS: crash / exit / restart; Execute unauthorized code or commands; Read memory; Modify memory
– Web servers, application servers, and web application environments are susceptible to buffer overflows, the notable exception being environments written in interpreted languages like Java or Python, which are immune to these attacks (except for overflows in the Interpreter itself).
Use a language or compiler that performs automatic bounds checking.
Use secure functions not vulnerable to buffer overflow.
If you have to use dangerous functions, make sure that you do boundary checking.
Implement- Stack Guard, ProPolice and the Microsoft Visual Studio, /GS flag these are the compiler based canary mechanisms.Unless this provides automatic bounds checking, it is not a complete solution.
Use OS-level preventative functionality. Not a complete solution.
Utilize static source code analysis tools to identify potential buffer overflow weaknesses in the software.
GENERAL TOOLS :
- Exploit Pack
- Visual Code Grepper – Code security scanning tool.
- API security testing tool.