Overview This script is designed to detect and remediate a specific vulnerability in curl and libcurl versions on UNIX-like systems. The vulnerability involves a heap-based buffer overflow during the SOCKS5 proxy handshake. The script checks for vulnerable curl versions, removes potentially insecure configurations from the .curlrc file, and unsets vulnerable environment variables. Functionality 1. command_exists: This function checks if a command is available in the system's PATH. 2. get_curl_version: Retrieves the version of curl installed on the system. 3. is_vulnerable_curl_version: Determines if the detected curl version falls within a vulnerable range. 4. remove_vulnerable_config: Removes vulnerable configurations from the .curlrc file if they exist. 5. unset_vulnerable_env_vars: Unsets vulnerable environment variables related to proxy settings. Script Execution - Usage: Save the script to a file (e.g., remediate.sh) and make it executable using chmod +x remediate.sh. - Check for curl: Execute the script with ./remediate.sh. It will verify if curl is installed. - Get curl version: If curl is installed, it retrieves the version. - Check vulnerability: Determines if the curl version is vulnerable. - Remediation: If a vulnerable version is detected, the script removes vulnerable configurations from .curlrc and unsets vulnerable environment variables. - Output: Provides feedback on the actions taken based on the detected curl version. Expected Output The script will produce an output indicating: - Whether curl is installed and its version. - Whether the curl version is vulnerable. - Actions taken for remediation, such as removing vulnerable configurations and unsetting environment variables. Example Output Detected curl version: 7.75.0 Curl version is vulnerable. Performing remediation... Vulnerable configurations removed from /home/user/.curlrc Vulnerable environment variable http_proxy unset Vulnerable environment variable HTTPS_PROXY unset Conclusion This bash script offers precise vulnerability detection and proactive remediation for insecure curl and libcurl versions on UNIX-like systems. Its streamlined functionality accurately identifies vulnerable versions, removes insecure configurations from .curlrc, and unsets vulnerable environment variables. With clear usage instructions and informative feedback, users can swiftly secure their systems against potential heap-based buffer overflow risks. Regular execution and updating to secure versions are recommended for sustained system security.