github.com/kaydxh/golang@v0.0.131/pkg/gocv/cgo/third_path/graphics-magick/share/doc/GraphicsMagick/www/security.html (about) 1 <?xml version="1.0" encoding="utf-8" ?> 2 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 3 <html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en"> 4 <head> 5 <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 6 <meta name="generator" content="Docutils 0.15.2: http://docutils.sourceforge.net/" /> 7 <title>GraphicsMagick Security</title> 8 <link rel="stylesheet" href="docutils-articles.css" type="text/css" /> 9 </head> 10 <body> 11 12 <div class="banner"> 13 <img src="images/gm-107x76.png" alt="GraphicMagick logo" width="107" height="76" /> 14 <span class="title">GraphicsMagick</span> 15 <form action="http://www.google.com/search"> 16 <input type="hidden" name="domains" value="www.graphicsmagick.org" /> 17 <input type="hidden" name="sitesearch" value="www.graphicsmagick.org" /> 18 <span class="nowrap"><input type="text" name="q" size="25" maxlength="255" /> <input type="submit" name="sa" value="Search" /></span> 19 </form> 20 </div> 21 22 <div class="navmenu"> 23 <ul> 24 <li><a href="index.html">Home</a></li> 25 <li><a href="project.html">Project</a></li> 26 <li><a href="download.html">Download</a></li> 27 <li><a href="README.html">Install</a></li> 28 <li><a href="Hg.html">Source</a></li> 29 <li><a href="NEWS.html">News</a> </li> 30 <li><a href="utilities.html">Utilities</a></li> 31 <li><a href="programming.html">Programming</a></li> 32 <li><a href="reference.html">Reference</a></li> 33 </ul> 34 </div> 35 <div class="document" id="graphicsmagick-security"> 36 <h1 class="title">GraphicsMagick Security</h1> 37 38 <!-- -*- mode: rst -*- --> 39 <!-- This text is in reStucturedText format, so it may look a bit odd. --> 40 <!-- See http://docutils.sourceforge.net/rst.html for details. --> 41 <div class="section" id="background"> 42 <h1>Background</h1> 43 <p>Although GraphicsMagick is image processing software, security is a 44 very important consideration for GraphicsMagick. GraphicsMagick may 45 be used to open files and URLs produced by an untrusted party. Given 46 a suitable weakness (which we make every effort to prevent), an 47 intentionally constructed file might be able to cause the software to 48 crash, leak memory, request huge amounts of memory, run forever, or in 49 the worst case execute arbitrary code, including shell code. 50 GraphicsMagick is very powerful and complex software supporting many 51 capabilities and so untrusted parties should never be allowed to 52 submit arbitrary requests into it.</p> 53 <p>GraphicsMagick includes the ability to access arbitrary http and ftp 54 URLs as well as local image, font, and SVG files. The SVG renderer 55 supports read access to http and ftp URLs as well as local files 56 according to the SVG specification. Since URLs and local file paths 57 may be included in SVG files, untrusted SVG files may create a Server 58 Side Request Forgery (<a class="reference external" href="https://cwe.mitre.org/data/definitions/918.html">SSRF</a>) vulnerability since URL requests are 59 done by the computer executing the SVG, which may be in a realm of 60 trust (e.g. inside the firewall and able to access "localhost" 61 addresses).</p> 62 <p>The <cite>-comment</cite>, <cite>-draw</cite>, <cite>-format</cite>, and <cite>-label</cite> utility options 63 support a <cite>@filename</cite> syntax to incorporate any readable file on the 64 system as a convenience to the user. If text from an untrusted source 65 (e.g. a web page) is allowed to supply these options, then they may be 66 used to read arbitrary files, creating a potential security hazard.</p> 67 <p>The GraphicsMagick project is continually striving to eliminate 68 conditions in the software which might pose a risk for its users while 69 not constraining what its users may do with the software.</p> 70 </div> 71 <div class="section" id="reporting-issues"> 72 <h1>Reporting Issues</h1> 73 <p>If you become aware of a serious security issue with GraphicsMagick, 74 then it may be addressed by email directly to the GraphicsMagick 75 maintainers or to the <a class="reference external" href="mailto:graphicsmagick-security%40graphicsmagick.org">GraphicsMagick Security</a> mail address. More 76 minor issues are best addressed via the <a class="reference external" href="https://sourceforge.net/p/graphicsmagick/bugs/">GraphicsMagick Bug Tracker</a> 77 at SourceForge. Please remember to set the bug to 'private' if you 78 use the bug tracker or else someone may aquire a zero-day exploit from 79 your report. We will set the bug to 'public' as soon as a remedy has 80 been made available.</p> 81 <p>Reporting an issue will allow us to fix it so that future releases of 82 the software won't suffer from the problem.</p> 83 <p>The current state of free software is that security-sensitive free 84 software projects have been undergoing automated testing by machines 85 (and sometimes what might be hundreds of machines). Machines do not 86 need to work at a day job, take care of families, rest, or eat, but we 87 do. Any bug report which comes with a patch or changeset to fix the 88 problem is greatly appreciated and helps to move the project forward.</p> 89 <p>The remedy available to us is to submit a changeset to the 90 GraphicsMagick Mercurial repository, and include the changes in the 91 next release. Regardless of how an issue becomes known to us, the 92 issue will become public knowledge as soon as we commit a fix to the 93 source code repository. Only in exceedingly rare and dire 94 circumstances (e.g a previously-unknown zero-day shell exploit) might 95 we do anything different.</p> 96 </div> 97 <div class="section" id="safe-use-of-the-software"> 98 <h1>Safe Use Of The Software</h1> 99 <p>You are the first line of defense when it comes to GraphicsMagick 100 security!</p> 101 <p>If you are operating a server which supports file uploads from 102 untrusted users, or delivered via a network protocol such as http, 103 ftp, or email, then you should take steps to assure that a problem 104 with opening/processing the file does not place the whole server at 105 risk. These are steps which can be taken:</p> 106 <ol class="arabic"> 107 <li><p class="first">Subscribe to the <a class="reference external" href="https://lists.sourceforge.net/lists/listinfo/graphicsmagick-announce">graphicsmagick-announce</a> mailing list so that 108 you are informed about new GraphicsMagick releases or special 109 security bulletins.</p> 110 </li> 111 <li><p class="first">Make sure that GraphicsMagick is up to date as reported on the 112 GraphicsMagick web site. Don't simply trust that packages from 113 your operating system vendor are kept up to date or are updated to 114 include security fixes. Keeping GraphicsMagick up to date might 115 require that you compile GraphicsMagick yourself from source code.</p> 116 </li> 117 <li><p class="first">Execute the software in a <a class="reference external" href="https://en.wikipedia.org/wiki/Operating-system-level_virtualization">Container</a>, <a class="reference external" href="https://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/jails.html">FreeBSD Jail</a>, <a class="reference external" href="https://illumos.org/man/5/zones">Solaris 118 Zone</a>, or <a class="reference external" href="https://en.wikipedia.org/wiki/Chroot">chrooted</a> environment such that it can not cause harm 119 to the system running it.</p> 120 </li> 121 <li><p class="first">Execute the software as a least-privileged user (e.g. 'nobody').</p> 122 </li> 123 <li><p class="first">Normalize input file names or any other external inputs so that 124 they are under your control and not controlled by an untrusted 125 party. This should include any file name specifications, which may 126 include arbitrary 'glob' patterns (wildcards) (requiring hours or 127 days to complete if sufficiently close long file names exist), and 128 options supporting a <cite>@filename</cite> syntax.</p> 129 </li> 130 <li><p class="first">Enforce that uploaded files are passed to the expected reader. For 131 example, the uploaded file "file.jpg" is forced to be read by the 132 JPEG reader (rather than a reader selected based on header magic 133 testing) by using the file name "jpg:file.jpg". If the file is not 134 really what was indicated, then an error is reported.</p> 135 <p>GraphicsMagick supports a great many file types and auto-detects 136 many file types based on their content rather than file extension. 137 The file which pretends to be an ordinary PNG or JPEG file might be 138 something else entirely. Note that even using independent file 139 header testing may not be sufficient since it is possible to 140 construct valid files with a header which appears to be several 141 different types, but the first type which matches while testing the 142 header will be selected.</p> 143 </li> 144 <li><p class="first">Apply resource limits via the <cite>-limit</cite> option or the 145 <cite>MAGICK_LIMIT_*</cite> environment variables (e.g. <cite>export 146 MAGICK_LIMIT_PIXELS=30Mp</cite>, <cite>export MAGICK_LIMIT_MEMORY=500Mb</cite>). 147 Also consider setting resource limits using the <cite>ulimit</cite> command.</p> 148 </li> 149 <li><p class="first">Consider using the <cite>MAGICK_CODER_STABILITY</cite> environment variable to 150 constrain the supported file formats to the subsets selected by 151 <cite>PRIMARY</cite> or <cite>STABLE</cite>. After setting this environment variable 152 (e.g. <cite>export MAGICK_CODER_STABILITY=PRIMARY</cite>), use <cite>gm 153 convert -list format</cite> and verify that the format support you need 154 is enabled. Selecting the <cite>PRIMARY</cite> or <cite>STABLE</cite> options blocks 155 access of http and ftp URLs (<a class="reference external" href="https://cwe.mitre.org/data/definitions/918.html">SSRF</a> vulnerability), but does not 156 block SVG renderer access to read local image files.</p> 157 </li> 158 </ol> 159 </div> 160 <div class="section" id="pgp-public-key"> 161 <h1>PGP Public Key</h1> 162 <p>The following PGP public key (belonging to Bob Friesenhahn) is used to 163 sign release files on the ftp site and may be used for private 164 correspondence:</p> 165 <pre class="literal-block"> 166 -----BEGIN PGP PUBLIC KEY BLOCK----- 167 168 mQMuBFvWDmMRCACvO+aWyRPlp7jezY8m4t8q+MkLQXczLCoC8sUVQ5qd5T28HsfD 169 rUVzrFYY6pWT1K3AgTTKZnVcBO5lyZtLLS6HQI41FESp1Gp/FtyisYbOlQAeOvfG 170 yJVCQe16QoaHye0UIC8rs2VqH055nSewk7YOpEg9PNdHce0/Mvajkxyj2Eb6C4jp 171 mZuvcPhU4MaEqo9yAlSnRztwqmmDwvO60LPEoS7WRUB3oEqDGGR8wnMARbCwjlVn 172 kMHd5BqgOnFDhqxxGnQzq+dv9C4RKGZtpIFl+jVpx9m5DszF9ZYEDtNMwxAoCIia 173 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