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Message-ID: <00a501c23ffb$a223edc0$e62d1c41@kc.rr.com> From: mattmurphy at kc.rr.com (Matthew Murphy) Subject: Abcnews.com - XSS in Stories by ZIP Code Feature Advisory WA-2002-01: Vulnerability in Abcnews.com Stories by ZIP Code Feature This is my first advisory in what will more than likely become a series of similar things on cross-site scripting at major web sites. When we think of XSS bugs, we think of typical things, search boxes, guestbooks, etc. "Stories by ZIP Code" was not on my list. :-) A vulnerability in the way this is handled at abcnews.com results because the box is not required to contain all-numerical data, and is allowed arbitrary length -- and, returned unfiltered when a search fails. The example URL here will cause a textarea to display below the box. Type in a JS command and double click to see it working: http://my.abcnews.go.com/localpageMainHandler?input=%22%3E%3CTEXTAREA+STYLE% 3Dheight%3A300px%3B+width%3D300px+ONDBLCLICK%3Deval%28this.value%29%3E%3C%2F TEXTAREA%3E&input.x=0&input.y=0 "The reason the mainstream is thought of as a stream is because it is so shallow." - Author Unknown
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