[wp-hackers] Advice on possible malware affecting multiple sites on same server

[Otto]

Check the color settings of the image file.

I've seen installs of GD that are unable to cope with indexed color
images, changing them to 24 or 32-bit RGB images fixed the problem.
This most commonly appears when the images are black and white, but
any indexed color image can cause the issue.

Converting the images to PNG files with full-color before uploading
them is probably the simplest solution.

-Otto



On Fri, Jul 26, 2013 at 12:43 PM, Patty Ayers <patty at ayersvirtual.com> wrote:
> An update on this: I figured out that the problem is *only* with GIF
> images. It happens 100% of the time with GIFs, and zero with other image
> files. And it happens on every site on my hosting account. A colleague
> suggested that I ask my host if they could check on the configuration of
> the GD Library, which could cause something like this, he says. I've asked,
> so will see what they say.
>
> Thanks again, all - I'll let you know if I figure this out.
>
> Patty
>
>
>
>> On Fri, Jul 26, 2013 at 9:50 AM, A5D <info at a5d.org> wrote:
>>
>>> Possibly try running Regenerate Thumbnails:
>>> http://wordpress.org/plugins/regenerate-thumbnails/
>>>
>>> Lee
>>>
>>>
>>> On 26 Jul 2013, at 14:48, Nikola Nikolov wrote:
>>>
>>> > Can you check if the other sizes are actually created on the server? Go
>>> to
>>> > the uploads( /wp-content/uploads/mm/yyyy ) directory and see if you get
>>> > multiple files with similar names for each upload that you make. It's
>>> > possible that the other sizes are simply not created(I'm not sure what
>>> > would cause that but I assume it could be some server configuration
>>> issue).
>>> >
>>> > That's the first thing I can think of.
>>> >
>>> >
>>> > On Fri, Jul 26, 2013 at 4:26 PM, Patty Ayers <patty at ayersvirtual.com>
>>> wrote:
>>> >
>>> >> If this isn't appropriate for this list, I apologize, but I'm not sure
>>> >> where to turn and I know there are experts here. Any advice will be
>>> much
>>> >> appreciated.
>>> >>
>>> >> I have a shared server with about 20 WordPress sites. Yesterday, on one
>>> >> site, an issue appeared in the Media Uploader: the selection of sized
>>> >> images is created, but does not show up as available for inserting.
>>> Only
>>> >> the largest size shows up.
>>> >>
>>> >> I troubleshot that site's issue, but then gradually discovered that the
>>> >> exact same issue is appearing on every one of my WordPress sites.
>>> >>
>>> >> I have tried de-activating all plugins and reverting to the default
>>> theme,
>>> >> and the issue persists. The sites don't have anything in common except
>>> for
>>> >> WordPress itself and being on the same shared server.
>>> >>
>>> >> What is the best way to proceed in this situation? Thanks very much in
>>> >> advance for any help.
>>> >>
>>> >> Best,
>>> >>
>>> >> Patty
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