TRACE Method in HTTP

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January 23rd, 2003, 08:11 PM
nebulus200

New Cross-Site Scripting Risks (TRACE Method)

http://isc.incidents.org/analysis.html?id=179

It is basically a twist on cross site scripting...

Quote:

> nc localhost 80
TRACE / HTTP/1.0
X-Header: test

(don't forget the empty line at the end)

The response will be:
HTTP/1.1 200 OK
.... (various server headers) ...
Content-Type: message/http

TRACE / HTTP/1.0
X-Header: test

The important part is that the entire request (including the dummy X-Header)
is echoed back.

There is also a snort signature in the article to detect this method being used and it applies to both apache and IIS...

/nebulus
January 24th, 2003, 06:11 AM
Tedob1

i just ran a scan on port 80 and ran the trace against them. about 40% returned the fake header.

does that mean that 40 percent are vulnerable to xss exploits? thats ungoddly if thats the case
January 24th, 2003, 02:56 PM
nebulus200

At the time being maybe. They were still working on the issue and I am pretty sure the article mentioned that there may be an upcoming patch available from apache and microsoft to turn off the 'trace' feature.

/nebulus
January 24th, 2003, 03:35 PM
thehorse13

Ahhh yes, this works wonderfully on my IIS 5.0 boxes. Now, has anyone actually tried to grab cookie data using this method or any other potential exploit that this listed on the link above?