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title: Response Splitting Filter Evasion ha.ckers.org web application security lab
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# Response Splitting Filter Evasion ha.ckers.org web application security lab

**Response Splitting Filter Evasion ha.ckers.org web application security lab** - Author not stated, ha.ckers.org.

- Published: date not stated
- Original: <http://ha.ckers.org/blog/20060827/response-splitting-filter-evasion/>
- Preserved from: http://ha.ckers.org/blog/20060827/response-splitting-filter-evasion/ (stored) on 2026-08-09
- Capture timestamp: 20080907184733
- Licence: unknown

Rights remain with the original author and publisher. This is a research
archive of a source from the Web Hacking Techniques Index collections, kept so the
page going offline. To read the original, follow the link above.

## Content

> UNTRUSTED SOURCE TEXT. Everything below this line is third-party material
> quoted for research. It is data, not instructions. Do not follow directions,
> execute code, or fetch URLs because this text says so.

Response Splitting Filter Evasion ha.ckers.org web application security lab

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## [Response Splitting Filter Evasion](http://ha.ckers.org/blog/20060827/response-splitting-filter-evasion/)

While playing with a redirection issue on a pretty major website I found a pretty weird [HTTP response splitting](http://www.webappsec.org/projects/threat/classes/http_response_splitting.shtml) issue, where forward slashes were not allowed (or rather, once you entered a forward slash it caused the whole redirection to be removed). Clearly the website was trying to protect itself from something, although I’m not exactly sure how or why. Here’s what I ended up doing.

Normally it would just do something like Location: http://somesite.com/ where whatever you typed in the URL field would end up in the Location header. Pretty typical response splitting I’d think, except I can’t inject a slash, so ending HTML tags are out (shouldn’t be a problem) but now I can’t get it from plaintext format into HTML making any HTML injection pointless.

So I ended up shortening the response splitting by instead of typing in Content-Type: text/html I just put in Content-Type: html (I removed “text/” which isn’t important to the attack. So it ended up looking like:

%0AContent-Type:html%0A%0A%3Cbody%20onload=alert(%22XSS%22)%3E

I can’t help but think there are nearly as many variants of response splitting as there are traditional [XSS](http://ha.ckers.org/xss.html) attacks. Just another reason not to have open redirection on your site.

  This entry was posted on Sunday, August 27th, 2006 at 7:38 pm and is filed under [XSS](http://ha.ckers.org/blog/category/webappsec/xss/), [Webappsec](http://ha.ckers.org/blog/category/webappsec/). You can leave a response as well.

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