Package Instance

HTTP Request Smuggling in ruby webrick
An issue was discovered in the WEBrick toolkit through 1.8.1 for Ruby.
It allows HTTP request smuggling by providing both a Content-Length
header and a Transfer-Encoding header, e.g.,
"GET /admin HTTP/1.1\r\n" inside of a "POST /user HTTP/1.1\r\n"
request.

NOTE: the supplier''s position is "Webrick should not be used in production."

Ruby WEBrick read_headers method can lead to HTTP Request/Response Smuggling
Ruby WEBrick read_header HTTP Request Smuggling Vulnerability

This vulnerability allows remote attackers to smuggle arbitrary HTTP
requests on affected installations of Ruby WEBrick. This issue is
exploitable when the product is deployed behind an HTTP proxy that
fulfills specific conditions.

The specific flaw exists within the read_headers method. The issue
results from the inconsistent parsing of terminators of HTTP headers.
An attacker can leverage this vulnerability to smuggle arbitrary
HTTP requests. Was ZDI-CAN-21876.

Potential HTTP Request Smuggling Vulnerability in WEBrick
WEBrick was too tolerant against an invalid Transfer-Encoding header. This may lead to
inconsistent interpretation between WEBrick and some HTTP proxy servers, which may
allow the attacker to "smuggle" a request. See CWE-444 in detail.