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  1. Moodle
  2. MDL-70735

Reduce information disclosure from TCPDF version

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    • MOODLE_311_STABLE
    • MOODLE_311_STABLE
    • MDL-70735-pdf-metadata
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      1) Add the attached test script to your web root and run it in a browser

      http://moodle.local/MDL-70735-pdf-hello-world.php

      2) Save this PDF

      3) Inspect the metadata with any pdf metadata tool such as pdfinfo on linux

       

      $ pdfinfo doc.pdf 
      Producer: TCPDF (http://www.tcpdf.org)
      		 
      CreationDate: Fri Jan 29 12:27:49 2021 AEDT
      		 
      ModDate: Fri Jan 29 12:27:49 2021 AEDT
      		 
      Tagged: no
      		 
      UserProperties: no
      		 
      Suspects: no
      		 
      Form: none
      		 
      JavaScript: no
      		 
      Pages: 1
      		 
      Encrypted: no
      		 
      Page size: 595.276 x 841.89 pts (A4)
      		 
      Page rot: 0
      		 
      File size: 67768 bytes
      		 
      Optimized: no
      		 
      PDF version: 1.7

      4) Confirm that the Producer says 'TCPDF (http://www.tcpdf.org)' 

      Show
      1) Add the attached test script to your web root and run it in a browser http://moodle.local/MDL-70735-pdf-hello-world.php 2) Save this PDF 3) Inspect the metadata with any pdf metadata tool such as pdfinfo on linux   $ pdfinfo doc.pdf Producer: TCPDF (http://www.tcpdf.org) CreationDate: Fri Jan 29 12:27:49 2021 AEDT ModDate: Fri Jan 29 12:27:49 2021 AEDT Tagged: no UserProperties: no Suspects: no Form: none JavaScript: no Pages: 1 Encrypted: no Page size: 595.276 x 841.89 pts (A4) Page rot: 0 File size: 67768 bytes Optimized: no PDF version: 1.7 4) Confirm that the Producer says 'TCPDF ( http://www.tcpdf.org )' 

      We've had a couple pen tests report information disclosure from the PDF metadata. It is admittedly very low but discloses the version of tcpdf which could be related future known vulnerabilities in that version.

       

        1. image-2021-02-17-13-16-09-624.png
          image-2021-02-17-13-16-09-624.png
          30 kB
        2. MDL-70735-pdf-hello-world.php
          0.2 kB

            brendanheywood Brendan Heywood
            brendanheywood Brendan Heywood
            Nicholas Hoobin Nicholas Hoobin
            Adrian Greeve Adrian Greeve
            Janelle Barcega Janelle Barcega
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