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                         AUSCERT Security Bulletin

                               ASB-2016.0050
       Multiple vulnerabilities have been discovered in ImageMagick
                                5 May 2016

===========================================================================

        AusCERT Security Bulletin Summary
        ---------------------------------

Product:              ImageMagick
Operating System:     UNIX variants (UNIX, Linux, OSX)
                      Windows
Impact/Access:        Execute Arbitrary Code/Commands -- Remote with User Interaction
                      Delete Arbitrary Files          -- Remote with User Interaction
                      Provide Misleading Information  -- Remote with User Interaction
                      Access Confidential Data        -- Remote with User Interaction
Resolution:           Mitigation
CVE Names:            CVE-2016-3718 CVE-2016-3717 CVE-2016-3716
                      CVE-2016-3715 CVE-2016-3714 
Member content until: Saturday, June  4 2016

Comment: CVE-2016-3714 is currently being exploited in the wild.

OVERVIEW

        Multiple vulnerabilities have been discovered in ImageMagick. [1][2]


IMPACT

        The vendor has provided the following information:
        
        "We have recently received vulnerability reports for certain coders,
        they include possible remote code execution and ability to render 
        files on the local system." [1]
        
        Independent security researchers have provided the following 
        additional information:
        
        "CVE-2016-3714 - Insufficient shell characters filtering leads 
        to (potentially remote) code execution
        
        Insufficient filtering for filename passed to delegate's command 
        allows remote code execution during conversion of several file 
        formats." [2]
        
        "CVE-2016-3718 - SSRF
        
        It is possible to make HTTP GET or FTP request" [2]
        
        "CVE-2016-3715 - File deletion
        
        It is possible to delete files by using ImageMagick's 'ephemeral' 
        pseudo protocol which deletes files after reading." [2]
        
        "CVE-2016-3716 - File moving
        
        It is possible to move image files to file with any extension in any
        folder by using ImageMagick's 'msl' pseudo protocol." [2]
        
        "CVE-2016-3717 - Local file read (independently reported by original
        research author - Stewie)
        
        It is possible to get content of the files from the server by using
        ImageMagick's 'label' pseudo protocol." [2]


MITIGATION

        Updates have not been completed at this time. The following 
        workarounds are provided by independent security researchers but are
        not guaranteed to be effective against all attacks. Therefore, 
        AusCERT recommends these workarounds as a temporary solution only:
        
        "1. Verify that all image files begin with the expected "magic 
        bytes" corresponding to the image file types you support before 
        sending them to ImageMagick for processing.
        
        2. Use a policy file to disable the vulnerable ImageMagick coders. 
        The global policy for ImageMagick is usually found in 
        "/etc/ImageMagick"." [2]


REFERENCES

        [1] ImageMagick Security Issue
            https://www.imagemagick.org/discourse-server/viewtopic.php?f=4&t=29588

        [2] ImageMagick Is On Fire - CVE-2016-3714
            https://imagetragick.com/

AusCERT has made every effort to ensure that the information contained
in this document is accurate.  However, the decision to use the information
described is the responsibility of each user or organisation. The decision to
follow or act on information or advice contained in this security bulletin is
the responsibility of each user or organisation, and should be considered in
accordance with your organisation's site policies and procedures. AusCERT
takes no responsibility for consequences which may arise from following or
acting on information or advice contained in this security bulletin.

===========================================================================
Australian Computer Emergency Response Team
The University of Queensland
Brisbane
Qld 4072

Internet Email: auscert@auscert.org.au
Facsimile:      (07) 3365 7031
Telephone:      (07) 3365 4417 (International: +61 7 3365 4417)
                AusCERT personnel answer during Queensland business hours 
                which are GMT+10:00 (AEST).
                On call after hours for member emergencies only.
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