> For the complete documentation index, see [llms.txt](https://playbook.sidthoviti.com/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://playbook.sidthoviti.com/devsecops/secure-coding/c-c++-secure-coding.md). # C/C++ Secure Coding | Language | Insecure Function | Vulnerability | Scenario | Remediation/Secure Function | | -------- | ------------------------------- | ----------------------------------------------- | ---------------------------------------------------------------------------------- | ---------------------------------------------------------- | | C | `strcpy` | Buffer Overflow | A software application takes user input and stores it in a fixed-size buffer. | `strncpy` with bounds checking and null termination | | C | `gets` | Stack Buffer Overflow | A program reads user input into a stack buffer without bounds checking. | `fgets` with bounds checking | | C | `malloc` with unchecked bounds | Heap Buffer Overflow | A program allocates memory for user data but does not check the size of the input. | Ensure loop limits are correct and check allocation size | | C | `strcpy` | Stack Buffer Overflow leading to Stack Smashing | A web server takes input from a request and copies it into a local stack buffer. | `strncpy` with bounds checking and null termination | | C | `system` | Command Injection | An application runs system commands based on user input. | Validate input, use `snprintf` and validate input securely | | C | Unchecked arithmetic operations | Integer Overflow | A program performs arithmetic operations without checking for overflow. | Check arithmetic bounds and validate inputs | | C | `printf` | Format String Vulnerability | A program prints user input directly using `printf`. | Use format specifiers, e.g., `printf("%s", user_input)` | #### String Handling Vulnerabilities | Language | Insecure Function | Vulnerability | Scenario | Remediation/Secure Function | | -------- | ---------------------------------- | --------------- | ----------------------------------------------------------------------------- | --------------------------------------------------- | | C | `strcpy` | Buffer Overflow | A software application takes user input and stores it in a fixed-size buffer. | `strncpy` with bounds checking and null termination | | C | `strncpy` without null termination | Buffer Overflow | A program uses `strncpy` but does not ensure null termination. | Ensure null termination after `strncpy` | #### Buffer Overflow | Language | Insecure Function | Vulnerability | Scenario | Remediation/Secure Function | | -------- | ------------------------ | --------------------- | ------------------------------------------------------------------------ | ----------------------------------------------------- | | C | `gets` | Stack Buffer Overflow | A program reads user input into a stack buffer without bounds checking. | `fgets` with bounds checking | | C | Manual memory management | Heap Buffer Overflow | A program does not properly manage dynamic memory allocation and bounds. | Use safe memory allocation functions and check bounds | #### Integer Security | Language | Insecure Function | Vulnerability | Scenario | Remediation/Secure Function | | -------- | ------------------------------- | ---------------- | ----------------------------------------------------------------------- | ------------------------------------------- | | C | Unchecked arithmetic operations | Integer Overflow | A program performs arithmetic operations without checking for overflow. | Check arithmetic bounds and validate inputs | #### Code Injection | Language | Insecure Function | Vulnerability | Scenario | Remediation/Secure Function | | -------- | ----------------- | ----------------- | -------------------------------------------------------- | ---------------------------------------------------------- | | C | `system` | Command Injection | An application runs system commands based on user input. | Validate input, use `snprintf` and validate input securely | #### Exploiting Formatted Output Functions | Language | Insecure Function | Vulnerability | Scenario | Remediation/Secure Function | | -------- | ----------------- | --------------------------- | ---------------------------------------------------- | ------------------------------------------------------- | | C | `printf` | Format String Vulnerability | A program prints user input directly using `printf`. | Use format specifiers, e.g., `printf("%s", user_input)` | --- # Agent Instructions This documentation is published with GitBook. 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