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Multiple Vendor ImageMagick Multiple Denial of Service Vulnerabilities
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SUMMARY
<http://www.imagemagick.org/> ImageMagick is "a suite of image
manipulation tools (animate, composite, conjure, convert, display,
identify, import, mogrify and montage) that are sometimes used by other
applications for processing image files". Remote exploitation of multiple
denial of service vulnerabilities in ImageMagick, as included in various
vendors' operating system distributions, allows attackers to consume
excessive CPU resources on the target system.
DETAILS
Vulnerable Systems:
* ImageMagick version 6.3.4
Immune Systems:
* ImageMagick version 6.3.5-9
The first vulnerability exists in the ReadDCMImage() function. Since the
return value of ReadBlobByte() is not properly checked, it can enter an
infinite loop.
The second vulnerability exists in the ReadXCFImage() function. Since the
return value of ReadBlobMSBLong() is not properly checked, it can enter an
infinite loop.
Analysis:
Exploitation of these vulnerabilities allows an attacker to consume
excessive CPU resource on the system using the ImageMagick library to
process images.
One way of exploiting these vulnerabilities is to persuade a targeted user
to open a malicious image file with a program that utilizes the
ImageMagick library.
As the tools that are part of ImageMagick are sometimes used as helper
tools by other applications, this user may be the same as the web server
user. This scenario is somewhat more severe than the previously described
attack vector since the image processing can occur automatically.
Workaround:
Exposure to some of these vulnerabilities can be mitigated by moving or
deleting the related module files. The file locations may vary between
distributions. The globbing expressions listed below correspond to a Red
Hat Linux system.
/usr/lib/ImageMagick-*/modules*/coders/dcm.*
/usr/lib/ImageMagick-*/modules*/coders/xcf.*
Vendor response:
The ImageMagick maintainers have addressed these vulnerabilities with the
release of version 6.3.5-9. More information is available from the
following URL.
<http://studio.imagemagick.org/pipermail/magick-announce/2007-September/000037.html>
http://studio.imagemagick.org/pipermail/magick-announce/2007-September/000037.html
CVE Information:
<http://www.cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2007-4985>
CVE-2007-4985
Disclosure timeline:
09/04/2007 - Initial vendor notification
09/05/2007 - Initial vendor response
09/19/2007 - Coordinated public disclosure
ADDITIONAL INFORMATION
The information has been provided by
<mailto:idlabs-advisories@idefense.com> iDefense Labs Security Advisories.
The original article can be found at:
<http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=596>
http://labs.idefense.com/intelligence/vulnerabilities/display.php?id=596
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