Ubuntu Security Notice USN-5855-3

Ubuntu Security Notice 5855-3 - USN-5855-2 fixed vulnerabilities in ImageMagick. Unfortunately an additional mitigation caused a regression. This update fixes the problem. It was discovered that ImageMagick incorrectly handled certain PNG images. If a user or automated system were tricked into opening a specially crafted PNG file, an attacker could use this issue to cause ImageMagick to stop responding, resulting in a denial of service, or possibly obtain the contents of arbitrary files by including them into images.

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