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Blogger_HTTP_response_splitting.txt

Blogger_HTTP_response_splitting.txt
Posted Jan 25, 2006
Authored by Meder Kydyraliev | Site o0o.nu

Blogger's personal page redirection mechanism contains a classic HTTP response splitting vulnerability in the "Location" HTTP header. The problem occurs due to use of unsanitized user-supplied data in the "Location" HTTP header, which enables attacker to inject CRLF(%0d%0a) characters thus splitting server's response taking full control over the contents of second HTTP response. Exploitation of the vulnerability can lead to cross-site scripting (XSS), cache poisoning and phishing attacks.

tags | advisory, web, xss
MD5 | 6d0529a5d76e9b40136f39019976a540

Blogger_HTTP_response_splitting.txt

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Blogger.com classic HTTP response splitting vulnerability
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

0. Original Advisory
~~~~~~~~~~~~~~~~~~~
http://o0o.nu/~meder/o0o_Blogger_HTTP_response_splitting.txt


I. Background
~~~~~~~~~~~~~

Blogger.com is Google's blogging service.


II. Description
~~~~~~~~~~~~~~~

Blogger's personal page redirection mechanism contains a classic HTTP
response splitting vulnerability in the "Location" HTTP header. The
problem occurs due to use of unsanitized user-supplied data in the
"Location" HTTP header, which enables attacker to inject CRLF(%0d%0a)
characters thus splitting server's response taking full control over
the contents of second HTTP response. Exploitation of the vulnerability
can lead to cross-site scripting (XSS), cache poisioning and phishing
attacks.

The following URL was taking contents of query string and using it in
"Location" HTTP header without proper sanitation:

http://www.blogger.com/r?[URL here]


III. Vendor status
~~~~~~~~~~~~~~~~~~

Vulnerability has been fixed on 13/01/2006


IV. Disclosure timeline
~~~~~~~~~~~~~~~~~~~~~~~

02/01/2006 - Issue discovered. Vendor notified.
02/01/2006 - Initial vendor response.
12/01/2006 - Vendor inquired on status.
13/01/2006 - Vendor response and confirmation that bug fixed.


V. References
~~~~~~~~~~~~~

1. http://www.packetstormsecurity.org/papers/general/whitepaper_httpresponse.pdf


--
http://o0o.nu/~meder

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