www.eVuln.com advisory:
HTTP Response Splitting in Social Share
Summary: http://evuln.com/vulns/168/summary.html 
Details: http://evuln.com/vulns/168/description.html 

-----------Summary-----------
eVuln ID: EV0168
Software: Social Share
Vendor: n/a
Version: 2010-06-05
Critical Level: low
Type: HTTP Response Splitting
Status: Unpatched. No reply from developer(s)
PoC: Available
Solution: Not available
Discovered by: Aliaksandr Hartsuyeu ( http://evuln.com/ )

--------Description--------
$_SERVER["HTTP_REFERER"] value is included in an HTTP response header sent to a web user without being validated for malicious characters.
Vulnerable script: vote.php

--------PoC/Exploit--------
HTTP Response Splitting Example.

Vulnerable code: $referrer = $_SERVER[HTTP_REFERER]; header("Location: $referrer");

HTTP query ("Referer" field):

Referer: http://some-link/\r\n[second new response]

---------Solution----------
Not available

----------Credit-----------
Vulnerability discovered by Aliaksandr Hartsuyeu
http://evuln.com/penetration-test.html - website penetration testing service