Updated samba packages fix security vulnerabilities:
Andrew Bartlett discovered that Samba incorrectly handled certain LDAP queries. A remote attacker could use this issue to cause Samba to crash, resulting in a denial of service, or possibly execute arbitrary code (CVE-2020-10730).
Douglas Bagnall discovered that Samba incorrectly handled certain queries. A remote attacker could possibly use this issue to cause a denial of service (CVE-2020-10745).
Andrei Popa discovered that Samba incorrectly handled certain LDAP queries. A remote attacker could use this issue to cause Samba to crash, resulting in a denial of service, or possibly execute arbitrary code (CVE-2020-10760).
The AD DC NBT server in Samba 4.0 will enter a CPU spin and not process further requests once it receives a empty (zero-length) UDP packet to port 137 (CVE-2020-14303).