All versions of Samba prior to 4.13.16 are vulnerable to a malicious client using an SMB1 or NFS race to allow a directory to be created in an area of the server file system not exported under the share definition. Note that SMB1 has to be enabled, or the share also available via NFS in order for this attack to succeed.

Affected: Ubuntu:20.04:LTS: samba

Orange Tsai discovered that the Samba vfs_fruit module incorrectly handled certain memory operations. A remote attacker could use this issue to cause Samba to crash, resulting in a denial of service, or possibly execute arbitrary code as root. (CVE-2021-44142)

Michael Hanselmann discovered that Samba incorrectly created directories. In certain configurations, a remote attacker could possibly create a directory on the server outside of the shared directory. (CVE-2021-43566)

Kees van Vloten discovered that Samba incorrectly handled certain aliased SPN checks. A remote attacker could possibly use this issue to impersonate services. (CVE-2022-0336)