Ubuntu Security Update USN-4643-1: atftp vulnerabilities

[LinuxBot]

It was discovered that atftp's FTP server did not properly handler certain input. An attacker could use this to to cause a denial of service (crash) or possibly execute arbitrary code. (CVE-2019-11365) It was discovered that atftp's FTP server did not make proper use of mutexes when locking certain data structures. An attacker could use this to cause a denial of service via a NULL pointer dereference. (CVE-2019-11366)

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