Internal address and port enumeration allowed by NoPrivateNetworkHttpClient in symfony/http-client

Vulnerability Description

symfony/http-client is a module for the Symphony PHP framework which provides powerful methods to fetch HTTP resources synchronously or asynchronously. When using the `NoPrivateNetworkHttpClient`, some internal information is still leaking during host resolution, which leads to possible IP/port enumeration. As of versions 5.4.46, 6.4.14, and 7.1.7 the `NoPrivateNetworkHttpClient` now filters blocked IPs earlier to prevent such leaks. All users are advised to upgrade. There are no known workarounds for this vulnerability.

References

• https://github.com/symfony/symfony/security/advisories/GHSA-9c3x-r3wp-mgxm
• https://github.com/symfony/symfony/commit/296d4b34a33b1a6ca5475c6040b3203622520f5b