https://bz.apache.org/bugzilla/show_bug.cgi?id=59627
Bug ID: 59627
Summary: request.getRequestURL() does not check if host header
value is a valid hostname format
Product: Tomcat 7
Version: unspecified
Hardware: PC
OS: Windows NT
Status: NEW
Severity: normal
Priority: P2
Component: Servlet & JSP API
Assignee: dev@tomcat.apache.org
Reporter: dhardik...@gmail.com
request.getRequestURL() method replaces the value of host header in the URL
before returning the value but it does not check if the value is in correct
hostname format.
Consider the following example:
GET /getReqURL/getURL HTTP/1.1
Host: localhost:8888
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:44.0) Gecko/20100101
Firefox/44.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: close
Cache-Control: max-age=0
In the above request, request.getRequestURL() returns
http://localhost:8888/getReqURL/getURL
If the above request is modified and host header is changed to:
GET /getReqURL/getURL HTTP/1.1
Host: <script>alert(1)</script>
User-Agent: Mozilla/5.0 (Windows NT 6.3; WOW64; rv:44.0) Gecko/20100101
Firefox/44.0
Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8
Accept-Language: en-US,en;q=0.5
Accept-Encoding: gzip, deflate
Connection: close
Cache-Control: max-age=0
request.getRequestURL() will return the following:
<script>alert(1)</script>/getReqURL/getUR
As per RFC2616 does not specify restrictions for a valid host header, this
results in lack of trust in value of request.getRequestURL()
Why this is a security issue:
Many web applications which uses the servlet API may depend on
request.getRequestURL() for internal URL redirection or displaying the complete
request URL path.
ex: response.write("Complete Request URL" : request.getRequestURL() );
This can result in an XSS if the Host header is modified.
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