[Snort-users] Updated rule sid 3192 WEB-CLIENT Windows Media Player directory traversal via Content-Disposition attempt

Matt Olney molney at ...1935...
Wed Feb 24 14:27:01 EST 2010

I jacked this rule up when I commited it into the system.  The analyst
that did it correctly built the rule and in testing I failed to get
the PCRE back in.

This will be fixed next build, but in the meantime, here is what it SHOULD be:

Windows Media Player directory traversal via Content-Disposition
attempt"; flow:from_server,established;
content:"Content-Disposition|3A|"; nocase; content:"filename=";
distance:0; nocase;
metadata:policy security-ips drop; reference:bugtraq,7517;
reference:cve,2003-0228; reference:nessus,11595;
classtype:attempted-user; sid:3192; rev:8;)


On Wed, Feb 24, 2010 at 2:06 PM, Willst Mail <willstmail at ...11827...> wrote:
> Hello,
> The VRT signatures released 2010-02-23 contain an updated version of
> SID 3192 "WEB-CLIENT Windows Media Player directory traversal via
> Content-Disposition attempt."  It looks like the rule became more
> generic than previous revisions: whereas earlier revisions had a pcre,
> this one just looks for "Content-Disposition " followed at some point
> by "filename="  We previously saw almost no alerts generated by this
> rule, but we have been seeing about 1200 per hour since the updated
> rule was released.  All of the alerts look to be responses from web
> servers to our internal clients, with an external sensor reporting the
> destination IP as our outbound gateway.
> Is anyone else seeing this sort of behavior?  From the handful of
> packets I have looked at so far, these appear to be mostly false
> positives.
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