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Requests for crossdomain.xml and other XML files

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Referrer Spam Bots that couse consistent 500 errors Broken or undebugged robots Requests for crossdomain.xml and other XML files Frivolous POSTs Lower case requests Non-PHP Web probes
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One popular type of rogue requests are requests for Flash crossdomain.xml file and sitemap.xml file. It checks if you site is providing some  services in a manner of Yahoo!, YouTube, Flickr, and Amazon via various public Web API. - - [17/Sep/2012:10:03:27 -0700] "GET /crossdomain.xml HTTP/1.1" 410 95 "" "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.89 Safari/537.1" - - [17/Sep/2012:10:10:41 -0700] "GET /sitemap.xml HTTP/1.1" 410 95 "-" "Mozilla/5.0 (compatible; sindice-site-manager/0.1.0 +" - - [17/Sep/2012:10:22:28 -0700] "GET /crossdomain.xml HTTP/1.1" 410 95 "-" "Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 5.1; YPC 3.2.0; GTB6; .NET CLR 1.0.3705; .NET CLR 1.1.4322; Media Center PC 4.0; .NET CLR 2.0.50727; .NET CLR 3.0.4506.2152; .NET CLR 3.5.30729; AskTbW3I4/" - - [17/Sep/2012:11:53:00 -0700] "GET /crossdomain.xml HTTP/1.1" 410 95 "" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.89 Safari/537.1" - - [17/Sep/2012:12:58:01 -0700] "GET /crossdomain.xml HTTP/1.1" 410 95 "-" "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)" - - [17/Sep/2012:13:28:00 -0700] "GET /crossdomain.xml HTTP/1.1" 410 95 "-" "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; Trident/5.0; FunWebProducts)" - - [17/Sep/2012:13:38:56 -0700] "GET /crossdomain.xml HTTP/1.1" 410 95 "-" "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0)" - - [17/Sep/2012:13:58:10 -0700] "GET /sitemap.xml HTTP/1.1" 410 95 "-" "Mozilla/5.0 (X11; Linux i686; rv:15.0) Gecko/20100101 Firefox/15.0" - - [17/Sep/2012:15:57:50 -0700] "GET /sitemap.xml HTTP/1.1" 410 95 "-" "Mozilla/5.0 (Macintosh; Intel Mac OS X 10.7; rv:14.0) Gecko/20100101 Firefox/14.0.1" - - [17/Sep/2012:20:06:23 -0700] "GET /crossdomain.xml HTTP/1.1" 410 95 "" "Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.89 Safari/537.1" - - [17/Sep/2012:20:51:24 -0700] "GET /crossdomain.xml HTTP/1.1" 410 95 "-" "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0; MAAU)" - - [17/Sep/2012:20:53:45 -0700] "GET /crossdomain.xml HTTP/1.1" 410 95 "-" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:12.0) Gecko/20100101 Firefox/12.0" - - [17/Sep/2012:21:59:03 -0700] "GET /crossdomain.xml HTTP/1.1" 410 95 "-" "Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64; Trident/5.0; FunWebProducts; MASP)" - - [17/Sep/2012:22:13:41 -0700] "GET /sitemap.xml HTTP/1.1" 410 95 "-" "Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv: Gecko/20100504 Firefox/3.5.10 GTB7.1" - - [17/Sep/2012:22:42:37 -0700] "GET /crossdomain.xml HTTP/1.1" 410 95 "" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.89 Safari/537.1" - - [17/Sep/2012:23:44:34 -0700] "GET /crossdomain.xml HTTP/1.1" 410 95 "" "Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.1 (KHTML, like Gecko) Chrome/21.0.1180.89 Safari/537.1" - - [18/Sep/2012:00:18:02 -0700] "GET /crossdomain.xml HTTP/1.1" 410 95 "" "Mozilla/5.0 (Windows NT 6.1; WOW64; rv:14.0) Gecko/20100101 Firefox/14.0.1" - - [18/Sep/2012:01:49:59 -0700] "GET /sitemap.xml HTTP/1.1" 410 95 "-" "Mozilla/5.0 (Windows NT 5.1; rv:15.0) Gecko/20100101 Firefox/15.0.1" - - [18/Sep/2012:02:35:28 -0700] "GET /sitemap.xml HTTP/1.1" 410 95 "-" "Mozilla/5.0 (Windows NT 5.1; rv:15.0) Gecko/20100101 Firefox/15.0.1 AlexaToolbar/alxf-2.15"

Please note that referrer is fake, if provided. So those are clearly probes and IPs in question need to be analyzed further as for their pattern of activity. 

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Aral Balkan · A site dedicated to crossdomain.xml

I just stumbled on a simple little site called that is devoted to the hugely useful yet somewhat shy and strangely mysterious crossdomain.xml file.

In the early days of Flash, the security sandbox was quite lax and sandbox security errors were almost unheard of. With each new version, however, Adobe (ok, ok, Macromedia) heightened the security of the player to address XSS (cross-site scripting) issues and other security concerns (like the hijacking of trusted network data from untrusted networks).

Instead of blocking data transfer between domains fully as Ajax does, however, Macromedia implemented the crossdomain.xml file so that server administrators can grant access to the data on their servers to either a list of selected domains or to any domain. Among other things, this makes it possible to consume web services from various public web APIs without using a server-side proxy but it does mean that the server has to implement either an open crossdomain.xml file (use the allow-access-from domain="*" rule) or that the server administrator has to add your domain to the list of allowed domains in the crossdomain.xml file. But which public services do this? This is where comes in.

The site currently lists four public web service providers that have implemented open crossdomain.xml files. These are Yahoo!, YouTube, Flickr, and Amazon. It also links to several articles with more information on crossdomain.xml files

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