Ubuntu Security Update USN-4688-1: JasPer vulnerabilities

[LinuxBot]

It was discovered that Jasper incorrectly certain files. An attacker could possibly use this issue to cause a crash. (CVE-2018-18873) It was discovered that Jasper incorrectly handled certain files. An attacker could possibly use this issue to cause a denial of service. (CVE-2018-19542) It was discovered that Jasper incorrectly handled certain JPC encoders. An attacker could possibly use this issue to execute arbitrary code. (CVE-2020-27828) It was discovered that Jasper incorrectly handled certain images. An attacker could possibly use this issue to expose sensitive information or cause a crash. (CVE-2017-9782)

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