USN-7239-1: libmicrodns vulnerabilities

It was discovered that libmicrodns could recursively follow the same compression pointer, leading to an infinite loop. An attacker could possibly use this issue to cause a denial of service. (CVE-2020-6071) It was discovered that libmicrodns did not check the return value of the rrdecode function, which could lead to a double free. An attacker could possibly use this issue to execute arbitrary code. (CVE-2020-6072) It was discovered that libmicrodns incorrectly handled certain inputs, which could lead to an integer overflow. An attacker could possibly use this issue to cause a denial of service. (CVE-2020-6073) It was discovered that libmicrodns incorrectly handled certain inputs, which could lead to a out-of-bounds read. An attacker could possibly use this issue to cause a denial of service. (CVE-2020-6077) It was discovered that libmicrodns incorrectly handled memory when parsing mDNS messages in mdnsrecv, which could lead to a NULL pointer dereference. An attacker could possibly use this issue to cause a denial of service. (CVE-2020-6078) It was discovered that libmicrodns incorrectly handled memory, which could lead to excessive memory consumption due to memory leaks. An attacker could possibly use this issue to cause a denial of service. (CVE-2020-6079, CVE-2020-6080)