convert not authorized aaaa error constitute c ReadImage 453

Question

I want to create a captcha pic by use convert from ImageMagick   And I follow this  but there are some problem    Input In my linux shell   convert -background white -fill black -font FreeSerif-Bold -pointsize 36 label  adfgh    test png   The Error is      convert not authorized adfgh   error constitute c ReadImage 453    convert missing an image filename   test png     error convert c ConvertImageCommand 3015   My ImageMagick  Version 6 7 2-7   I install it with yum install ImageMagick    I m clueless  Any advice please

User · Answer

Note  the solution in this and other answers involves disabling safety measures that are there to fix arbitrary code execution vulnerabilities  See for instance this ghostscript-related and this ubuntu-related announcement  Only go forward with these solutions if the input to convert comes from a trusted source    I use ImageMagick in php  v 7 1  to slice PDF file to images   First I got errors like      Exception type  ImagickException      Exception message  not authorized         error constitute c ReadImage 412   After some changes in  etc ImageMagick-6 policy xml I start getting erroes like      Exception type  ImagickException      Exception message  unable to create temporary file       Permission denied   error pdf c ReadPDFImage 465   My fix   In file  etc ImageMagick-6 policy xml  or  etc ImageMagick policy xml    comment line   lt  --  lt policy domain  coder  rights  none  pattern  MVG    gt  -- gt   change line   lt policy domain  coder  rights  none  pattern  PDF    gt    to   lt policy domain  coder  rights  read write  pattern  PDF    gt   add line   lt policy domain  coder  rights  read write  pattern  LABEL    gt     Then restart your web server  nginx  apache

User · Answer

After a recent update on my Ubuntu 16 04 system I have also started getting this error when trying to run convert on  ps files to convert them into pdfs    This fix worked for me    In a terminal run   sudo gedit  etc ImageMagick-6 policy xml   This should open the policy xml file in the gedit text editor  If it doesn t  your image magick might be installed in a different place   Then change   rights  none     to   rights  read   write     for PDF  EPS and PS lines near the bottom of the file  Save and exit  and image magick should then work again

User · Answer

If someone need to do it with one command after install  run this    sed -i  s  lt policy domain  coder  rights  none  pattern  PDF     gt   lt policy domain  coder  rights  read write  pattern  PDF     gt  g   etc ImageMagick-6 policy xml

User · Answer

I had this error when trying to convert a pdf to jpg and solved it using this method  sudo vi  etc ImageMagick  policy xml  change   policy domain  coder  rights  none  pattern  PDF   to   policy domain  coder  rights  read write  pattern  PDF   Source  http   realtechtalk com ImageMagick Convert PDF Not Authorized-2217-articles

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I use many times the ImageMagic convert command to convert   tif files to   pdf files   I don t know why but today I began to receive the following error   convert  not authorized  a pdf    error constitute c WriteImage 1028    After issuing the command   convert a tif a pdf   After reading the above answers I edited the file  etc ImageMagick-6 policy xml  and changed the line   policy domain  coder  rights  none  pattern  PDF     to  policy domain  coder  rights  read write  pattern  PDF    and now everything works fine   I have  ImageMagick 6 8 9-9 Q16 x86 64 2018-09-28  on  Ubuntu 16 04 5 LTS

User · Answer

The answer with highest votes  I have not enough reputation to add comment there  suggests to comment out the MVG line  but have in mind this      CVE-2016-3714      ImageMagick supports   svg  mvg  files which means that attackers can   craft code in a scripting language  e g  MSL  Magick Scripting   Language  and MVG  Magick Vector Graphics   upload it to a server   disguised as an image file and force the software to run malicious   commands on the server side as described above  For example adding the   following commands in a file and uploading it to a webserver that uses   a vulnerable ImageMagick version will result in running the command    ls -la  on the server       exploit jpg       push graphic-context viewbox 0 0 640 480 fill    url https   website com image png  ls  -la   pop graphic-context   And      Any version below 7 0 1-2 or 6 9 4-0 is potentially vulnerable and   affected parties should as soon as possible upgrade to the latest   ImageMagick version    Source

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After reading several suggestions here and combining the ideas  for me following changes in  etc ImageMagick-6 policy xml were necessary    lt policy domain  coder  rights  read write  pattern  PDF    gt        rights  none  did not help     pattern  LABEL  was not neccessary  Although I do not work with big png files  only  1 Mb  some changes in memory limits were also necessary    lt policy domain  resource  name  memory  value  2GiB   gt     instead of 256Mib   and   lt policy domain  resource  name  area  value  2GB   gt     instead of 128 MB

User · Answer

Note  this solution and any other  edit the policy xml  solution disables safety measures against arbitrary code execution vulnerabilities in ImageMagick  If you need to process input that you do not control 100   you should use a different program  not ImageMagick     If you re still here  you are trying to edit images that you have complete control over  know are safe  and cannot be edited by users   There is an  etc ImageMagick policy xml file that is installed by yum   It disallows almost everything  for security and to protect your system from getting overloaded with ImageMagick calls    If you re getting a ReadImage error as above  you can change the line to    lt policy domain  coder  rights  read  pattern  LABEL    gt    which should fix the issue   The file has a bunch of documentation in it  so you should read that  For example  if you need more permissions  you can combine them like    lt policy domain  coder  rights  read write  pattern  LABEL    gt       which is preferable to removing all permissions checks  i e   deleting or commenting out the line

User · Answer

I also had the error error constitute c ReadImage 453  when trying to convert an eps to a gif with image magick  I tried the solution proposed by sNICkerssss but still had errors  though different from the first one e error constitute c ReadImage 412 What solved the problem was to put read to other entries    lt policy domain  coder  rights  read  pattern  PS    gt    lt policy domain  coder  rights  read  pattern  EPS    gt    lt policy domain  coder  rights  read  pattern  PDF    gt    lt policy domain  coder  rights  read  pattern  XPS    gt    lt policy domain  coder  rights  read write  pattern  LABEL    gt

User · Answer

If you don t need to handle raster files and PDF PS EPS through the same tool  don t loosen ImageMagick s security   Instead  keep your defense in depth for your web applications intact  check that your Ghostscript has been patched for all known -dSAFER vulnerabilities and then invoke it directly   gs -dSAFER -r300 -sDEVICE png16m -o document- 03d png document pdf    -dSAFER opts you out of the legacy-compatibility  run Postscript will full permission to interact with the outside world as a turing-complete programming language  mode  -r300 sets the desired DPI to 300  the default is 72  -sDEVICE specifies the output format  See the Devices section of the manual for other choices   -o is a shorthand for -dBATCH -dNOPAUSE -sOutputFile  This section of the Ghostscript manual gives some example formats for for multi-file filename output but  for the actual syntax definition  it points you at the documentation for the C printf 3  function    If you re rendering EPS files  add -dEPSCrop so it won t pad your output to page size and use -sDEVICE pngalpha to get transparent backgrounds

User · Answer

Just delete  etc ImageMagick policy xml file  E g  rm  etc  lt ImageMagick PATH gt  policy xml  For ImageMagick 6  it s  sudo rm  etc ImageMagick-6 policy xml

[imagemagick] convert:not authorized `aaaa` @ error/constitute.c/ReadImage/453

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