Threats affecting pkg:composer/symfony/validator

The Symfony Validator component IpValidator incompletely classifies internal addresses in the filtered modes of the Ip constraint, so some internal addresses are accepted as public, which can lead to Server-Side Request Forgery (SSRF) in Symfony versions prior to 5.4.56, 6.x prior to 6.4.50, 7.x prior to 7.4.23, and 8.x prior to 8.1.11. In these modes, IpValidator relies on the PHP flags FILTER_FLAG_NO_PRIV_RANGE and FILTER_FLAG_NO_RES_RANGE to classify addresses as public, private, or reserved. These flags do not cover shared address space (100.64.0.0/10) or IPv4-mapped, IPv4-compatible, and 6to4 IPv6 addresses, which can embed internal IPv4 addresses. A value such as ::ffff:127.0.0.1 can therefore pass validation even though it points to an internal host. Applications that rely on the Ip constraint to reject internal addresses, for example before making a server-side request to a user-supplied address, can be exposed to SSRF.

CVE-2024-50343 is a vulnerability in the Symfony Validator component where inputs ending with a newline character (\n) can bypass validation rules using regular expressions with the $ metacharacter. This occurs because the Validator did not properly anchor the regex to the end of the input. The issue is fixed by adding the 'D' regex modifier to ensure the entire input is matched. Fixed versions include 5.4.43, 6.4.11, and 7.1.4.