lib/thin/connection.rb in Thin web server before 1.2.4 relies on the X-Forwarded-For header to determine the IP address of the client, which allows remote attackers to spoof the IP address and hide activities via a modified X-Forwarded-For header.
{
"cwe_ids": [
"CWE-20"
],
"github_reviewed": true,
"github_reviewed_at": "2020-06-16T21:41:36Z",
"nvd_published_at": "2009-09-22T10:30:00Z",
"severity": "HIGH"
}