[NBLUG/talk] Weird entries in logwatch..

Aaron Grattafiori aaron at digitalinfinity.net
Thu Jan 27 10:48:32 PST 2011


Steve,

That base64 data simply seems to be an image (png) (as referenced by
it's content type). URL Decoding it and then base64 decoding it
does confirms this. It was broken when I tried to display it (although
I might've broken something while trying to quickly decode it). The
comment says "Created with GIMP".

This seems like broken code somewhere.

Good job being diligent on watching your logs though!

-Aaron

On Thu, Jan 27, 2011 at 10:19 AM, Steve Johnson <srj at adnd.com> wrote:
> Hi NBluggers,
>
> I've been seeing an interesting entry in my logwatch reports for my apache
> logs..  Its a GET statement with a big chunk of base64 code attached to it
> with data:image/png as the type.  I am going to assume it is some type of
> exploit attempt, and since the logs show that apache is returning a 404
> responses that they are not getting anywhere with it.. I'm wondering if
> anyone has any details on this exploit, and what I can maybe do to stop them
> from even trying.
>
> Here's the log entry with the encoded GET statement:
>
> GET
> /pages/office-of-institutional-research/external-data-sources/url(data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAADgAAAAOCAYAAAB6pd%2buAAAAAXNSR0IArs4c6QAAAAZiS0dEAP8A%2fwD%2foL2nkwAAAAlwSFlzAAALEwAACxMBAJqcGAAAAAd0SU1FB9oGAhENK17O5ogAAAAZdEVYdENvbW1lbnQAQ3JlYXRlZCB3aXRoIEdJTVBXgQ4XAAAD6UlEQVRIx82WXWxTdRjGf6fndO3adbZ0VLoP9gFMXZQFNgSWDEkEYtSQkNVg4o2JH9NGJTMk6k01vTIhXshFzTCKE5NFORoXXDBs4nTMZHMzSETHDKyQyb7Xbu36dc7p8aaQZm5GNzd8rk7evOf%2fz%2fM%2bz%2f99X4E1htcn68v5742mffVRJd19uucqH539lSq3yKuHtlDmkPj99aPYe39kfRoMOqgCJHSdJNRL3AEE%2fB7h3xZFgO6JuRQdl6PE8zfRPzlF71CEojoXFc%2b9SPy3KxjCc%2bgCpIE0IilB65YWHFQBfAbUZEIDQGPA7xngDsNgMpFUY0Q0ESHHhKbkM3A9yoFqDceGQpTijWjhXxCAtC6gCWk0BAwLzqkAQsC6TJVDGcKrZdeDXp%2fcvki8zeuTH8uO6ehYzRJumxEUBUkyMa%2baUDWBVDLNnJJgNE9ixGZiOlckaQAVAWmBdTqBzqxQJ%2fD2KgrTCDzq9clywO%2fxZMi1AgcBBbhNPhyJ47TlsGuzjaHRSRRdoKq8AF3XOdvZw1BMQneUMl9iZN4eo3AmRWVwFulvqusAngBOryLBY0AcaPD65LeAFPAk0BLwe57OTnz3i4sc3ruFx2s24MwzoWgaW4tNnPn0JLt37KJ2zwGMgk5X3zd8ONJOX7mGvcK5OEGvT94HNGcs2rj!
>  SzrhUUwn4PV1AV4bcm5nwkYDfc3xhbs%2bVWQZH%2btlekc%2fDtRupKrub1uYT7NhWw9bde%2fl2REUSRR56pJT0lxofhM8xaheXVPA1oDPg9zT%2bExmsDqF8hUqmlvi%2bDUs6RWhW5Ov%2bKaxmK5XFLkIzIe7f%2fiBtwypPVZqIRWJ8Ny6x09OEJJs5rrTxn4yJY00NwRU0mtaMLY9kyL3n9clVAb%2fnley8wnyBkkIHrgILm925JGPTJONRDHqaHDQmx2a4Ph4hpFkpcZqZmBhHtbI4wYDfs3%2bNhn5bpqG03LKl1ydXAS97fXJ%2b9jv0Hq6lyK5C%2fBJ6PEjyj2nW2VQGLw5gLKqn92YSxWgjbrRy89ogVosFoyT%2bZUzcurjD65M71oDjCeDzbCIZ5VqAk9mJm9w5zAdPkRx%2bB3H6Y3Kj7TxQMkzLqfe5V71GvttFiduOa3aQc58E6JseJJXSEVhjeH2yvpxN5qVnygj%2fdJQCWxjBAOm0gVRC5MLPdoZnt2F3rsdisTAV7MBlusT3oVK6TOriCv4fIZnsSDlu1IQRNWVGV83kYKFuZzX7PQ1MFOg0j53nh%2bg8qpLg2eogeyJ53JFddDkLtyiZ6%2b%2b674Vu5cZXiIkJdAEMjnvIqzjEjVCS7rmrhOwC0Vwn58fqkIIXeL72Mn8CJn6UfKGeNt4AAAAASUVORK5CYII%3d)
> HTTP/1.1 with response code(s) 404 1 responses
>
>
> So, what do you guys think?
>
> -Steve
>
>
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