Accessing Wicket through AJP makes Wicket vulnerable to HTTP Response Splitting
Attack
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Key: WICKET-4196
URL: https://issues.apache.org/jira/browse/WICKET-4196
Project: Wicket
Issue Type: Bug
Components: wicket
Affects Versions: 1.4.19
Environment: CentOS 5.6, Apache HTTPD 2.2.3 with mod_jk 1.2.31 and
Apache Tomcat 6
Reporter: Gert-Jan Schouten
Priority: Critical
Hello all,
When having a Wicket application installed on Tomcat and you call that
application through HTTP, Wicket is protected against HTTP Response Splitting.
However, when you call Tomcat through AJP (for example through an apache httpd
proxy), HTTP Response Splitting becomes possible.
To demonstrate, I created a simple application and called it through an AJP
proxy with the curl command:
curl --max-redirs 0 -Dfoo
'http:///myapp/home?wicket:bookmarkablePage=:org.apache.wicket.markup.html.pages.BrowserInfoPage&cto=Foobar%3f%0d%0aEvilHeader:%20SPLIT%2f-%0d%0aAnotherEvilHeader:%20HEADER'
Note the '%0d%0a', a CRLF in the request. When calling Wicket through Tomcat,
these are replaced by spaces, but when calling Wicket through AJP, these are
left intact, getting us the following response:
HTTP/1.1 302 Moved Temporarily
Date: Wed, 02 Nov 2011 14:34:32 GMT
Server: Apache
Set-Cookie: JSESSIONID=4F403B53D091B40F6C3FBC2321A2E348.pub-app04; Path=/myapp;
HttpOnly Location:
http://<ip-address>/myapp/Foobar;jsessionid=4F403B53D091B40F6C3FBC2321A2E348.pub-app04?
EvilHeader: SPLIT/-
AnotherEvilHeader: HEADER
Content-Length: 0
Connection: close
Content-Type: text/plain; charset=UTF-8
Here we have 2 Evil Headers, that could be inserted by hackers by adding %0d%0a
to the get-request.
The problem is that a hacker can now post URL's that look like they're going to
your site on some forum or in an email. But when the user actually clicks on
the link, a custom header could redirect the user to a malicious site. In the
example, I used "EvilHeader", but it could be any header, like an HTTP 301
redirect. Basically, the hacker can include any header he wants in the response
that the user is going to get when he clicks on the link.
For a more detailed description of HTTP Response Splitting (which is on the
OWASP list of security vulnerabilities), you can check:
https://www.owasp.org/index.php/HTTP_Response_Splitting
http://www.acunetix.com/vulnerabilities/CRLF-injectionHTTP-respon.htm
http://packetstormsecurity.org/papers/general/whitepaper_httpresponse.pdf
http://www.infosecwriters.com/text_resources/pdf/HTTP_Response.pdf
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