A flaw was found in the AD DC NBT server in all Samba versions before 4.10.17, before 4.11.11 and before 4.12.4. A samba user could send an empty UDP packet to cause the samba server to crash.

References

• https://nvd.nist.gov/vuln/detail/CVE-2020-14303
• https://bugzilla.redhat.com/show_bug.cgi?id=1851298;
• https://lists.debian.org/debian-lts-announce/2020/11/msg00041.html
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/6YLNQ5GRXUKYRUAOFZ4DUBVN4SMTL6Q2/
• https://security.gentoo.org/glsa/202007-15
• https://security.netapp.com/advisory/ntap-20200709-0003/
• https://usn.ubuntu.com/4454-1/
• https://usn.ubuntu.com/4454-2/
• https://www.samba.org/samba/security/CVE-2020-14303.html
• http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00030.html
• http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00054.html
• http://lists.opensuse.org/opensuse-security-announce/2020-09/msg00002.html