Php curl default timeout1/7/2024 ![]() ![]() $url = 'file:///etc/passwd'įrom PHP 8.0 and later, curl_init function returns a CurlHandle object instead of a resource object. However, because there is no validation for it, an attacker providing a crafted URL can perform an SSRF attack. The snippet above might not be harmful if the provided URL is a safe URL. When using Curl with a user-provided URL, it is absolutely necessary to validate the provided URL, because not all URLS are HTTP/HTTPS URLS.Īn application that accepts a user-provided URL, and then return or make it accessible otherwise to the user opens a Server-Side Request Forgery vulnerability. This not only includes the widely used HTTP and HTTPS protocols, but also FTP, file, SCP, LDAP, and many others.Ĭurl will happily accept any protocol it supports, and there lies the first potential security vulnerability. curl extension supports a majority of features offered by libcurl, and that level of customizability requires careful tweaking and security hardening.ĭaniel Stenberg and hundreds of other bright contributors spend many hours developing new features and fixing security issues, but not all servers might run the latest version of Curl, which means it is necessarily to proactively guard against potential security vulnerabilities.Ĭurl supports more than 25 protocols, and PHP in turn supports many of the protocols Curl supports. ![]() PHP curl extension integrates libcurl, the underlying core of Curl with PHP. It supports modern features such as QUIC and TLS 1.3, and it comes with several customization options. Curl is powerful and feature-rich command line tool and a library for data transferring with URLs, with support for several protocols including HTTP and HTTPS, among dozens of others. ![]()
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