Apache uses a modified version of the isspace() macro. So it allows \f,\n,\r,\t (\v is not allowed, as far as I can recall) as whitespace. I know this affected lot of IPSes. Thanks, Pukhraj On 6/3/06, M. Dodge Mumford <dodge@xxxxxxx> wrote:
[Sorry to reply to my own post, but...] M. Dodge Mumford said: > Sigint Consulting said: > > perl -e 'print "GET \x0d/index.php\x90\x90 HTTP/1.0\n\r\n"'|nc > > 192.168.1.3 80 > > > > No alert is generated from the string above. > > [...] > > > We are not sure how much this may buy an attacker as the CR character > > may mess up any requests to the webserver, further research is needed > > on this. > > I performed this research while developing NFR's web signatures, and found > that all web servers I tested (several years ago) handled end-of-lines using > "\x0d\x0a" and "\x0a" interchangeably. If you find a web server that > interprets "index.php" in the example above as an actual filename, I for one > would be very interested in knowing about it. Apparently my memory is failing. If I performed this test, I remembered the results incorrectly. Mea culpa. -- Dodge
