Eclipse Vert.x 3.5.1 HTTP Header Injection

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# COMPASS SECURITY ADVISORY  
# https://www.compass-security.com/research/advisories/  
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# Product: Vert.x [1]  
# CSNC ID: CSNC-2018-021  
# Subject: HTTP Header Injection  
# Risk: Medium  
# Effect: Remotely exploitable  
# Author: Lukasz D. ([email protected])  
# Date: 12.06.2018  
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Introduction:  
-------------  
Eclipse Vert.x is a tool-kit for building reactive applications on the JVM.  
Vert.x can be used for simple network utilities, sophisticated modern web  
applications, HTTP/REST microservices, high volume event processing  
or a full-blown back-end message-bus applications. Vert.x is used by many  
different companies from real-time gaming to banking and everything in between.  
  
Vert.x does not filter carriage return and line feed characters from values of  
set HTTP response headers. This allows to manipulate values of the set HTTP  
headers and to add arbitrary new headers. In particular, issuing a redirection  
and manipulation of cookies set by the server is possible.  
  
Affected:  
---------  
The following Vert.x versions are vulnerable:  
- 3.0.0 - 3.5.1  
  
Technical Description:  
----------------------  
The method putHeader(String name, String value) used to set new headers in the  
HTTP response does not filter carriage return and line feed characters from  
the header value. If a web application uses a user-provided parameter as  
a value of the header, then it is possible for a user to add new HTTP headers  
of his choice.  
  
For example, a Vert.x-based web application may use the vulnerable method like  
this: putHeader("User-Header", foo), where foo is the user-provided parameter.  
  
Then:  
Requesting /vulnerable?foo=bar will add a header: "User-Header: bar".  
Requesting /vulnerable?foo=bar%0D%0ASet-Cookie:%20mycookie=hello will add  
a header: "User-Header: bar" and additionally will set a new cookie  
with name "mycookie" and value "hello".  
  
Workaround / Fix:  
-----------------  
It needs to be ensured that every header value which is set based on  
a user-provided parameter does not contain carriage return and line feed  
characters.  
  
Timeline:  
---------  
2018-02-22: Vulnerability discovered  
2018-04-04: Initial vendor notification  
2018-04-04: Initial vendor response  
2018-06-04: Patched version released  
2018-06-13: Public disclosure  
  
References:  
-----------  
[1]: https://vertx.io/  
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