Bug 528000

Hrm. This will be tough to fix/report upstream without a way to reproduce it.

There was problem with spamassasin which was workaround with rebuild of perl. But I made the change only in F-12 build. Could be the same issue? #510127

Here are some details. The lines causing the trouble are:

$format and $exifTool->Warn(
       sprintf("Unknown format ($format) for $dirName tag 0x%x",$tagID));

So $format and/or $dirName are tainted. I'm not a Perl guy, so I can hardly backtrack these variable's sources (it even comes from out of the module), but I think the faulty statement can be rewritten as:

$format and $exifTool->Warn(
       sprintf("Unknown format (%d) for %s tag 0x%x",$format,$dirName,$tagID));

in a more secure way that does not cause the taint problem, but at the expense of poorer readability, I agree.

From what I can see by examining Exif.pm, some other sprintf statements might be subject to similar problems (i.e.: lines 2918, 2941, 2972, ...).

I apologize for not being able to reproduce, but the line is reached when there is an unknown format in an Exif directory of a picture that I do not have anymore (rejected by SpamAssassin!)

Whether the current bug is related to bug 510127 or not is out of my Perl understanding... and since I do not know how to reproduce, I cannot even test it on rawhide :-( Sorry and thanks for the proposal.

You can try latest rebuild of perl for F-10. It will be in testing updates in few days or download from: http://koji.fedoraproject.org/koji/buildinfo?buildID=135920

If this generates taint errors, I'm surprised that exiftool doesn't
generate more.  The value of $format is obtained from an unpack('S',...)
call, so the result is guaranteed to be either undefined or a number
in the range 0 to 65535.  How is this a security problem when used
in a sprintf format string?

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