CVE-2019-11037

In PHP imagick extension in versions between 3.3.0 and 3.4.4, writing to an array of values in ImagickKernel::fromMatrix() function did not check that the address will be within the allocated array. This could lead to out of bounds write to memory if the function is called with the data controlled by untrusted party.

This update for php7-imagick fixes the following issues:

Upgrade to version 3.4.4:

Added:

• function Imagick::optimizeImageTransparency()
• METRIC_STRUCTURAL_SIMILARITY_ERROR
• METRIC_STRUCTURAL_DISSIMILARITY_ERROR
• COMPRESSION_ZSTD - https://github.com/facebook/zstd
• COMPRESSION_WEBP
• CHANNEL_COMPOSITE_MASK
• FILTER_CUBIC_SPLINE - 'Define the lobes with the -define filter:lobes={2,3,4} (reference https://imagemagick.org/discourse-server/viewtopic.php?f=2&t=32506).'
• Imagick now explicitly conflicts with the Gmagick extension.

Fixes:

• Correct version check to make RemoveAlphaChannel and FlattenAlphaChannel be available when using Imagick with ImageMagick version 6.7.8-x
• Bug 77128 - Imagick::setImageInterpolateMethod() not available on Windows
• Prevent memory leak when ImagickPixel::__construct called after object instantiation.
• Prevent segfault when ImagickPixel internal constructor not called.
• Imagick::setResourceLimit support for values larger than 2GB (2^31) on 32bit platforms.
• Corrected memory overwrite in Imagick::colorDecisionListImage()
• Bug 77791 - ImagickKernel::fromMatrix() out of bounds write. Fixes CVE-2019-11037, boo#1135418

The following functions have been deprecated:

• ImagickDraw, matte
• Imagick::averageimages
• Imagick::colorfloodfillimage
• Imagick::filter
• Imagick::flattenimages
• Imagick::getimageattribute
• Imagick::getimagechannelextrema
• Imagick::getimageclipmask
• Imagick::getimageextrema
• Imagick::getimageindex
• Imagick::getimagematte
• Imagick::getimagemattecolor
• Imagick::getimagesize
• Imagick::mapimage
• Imagick::mattefloodfillimage
• Imagick::medianfilterimage
• Imagick::mosaicimages
• Imagick::orderedposterizeimage
• Imagick::paintfloodfillimage
• Imagick::paintopaqueimage
• Imagick::painttransparentimage
• Imagick::radialblurimage
• Imagick::recolorimage
• Imagick::reducenoiseimage
• Imagick::roundcornersimage
• Imagick::roundcorners
• Imagick::setimageattribute
• Imagick::setimagebias
• Imagick::setimageclipmask
• Imagick::setimageindex
• Imagick::setimagemattecolor
• Imagick::setimagebiasquantum
• Imagick::setimageopacity
• Imagick::transformimage

It was discovered that PHP ImageMagick extension didn't check the address used by an array. An attacker could use this issue to cause PHP ImageMagick to crash, resulting in a denial of service.

USN-4586-1 fixed vulnerabilities in PHP ImageMagick. This update provides the corresponding update for Ubuntu 16.04 ESM.

Original advisory details:

It was discovered that PHP ImageMagick extension didn't check the address used by an array. An attacker could use this issue to cause PHP ImageMagick to crash, resulting in a denial of service.