Affected: Samba

The Samba vfs_fruit module uses extended file attributes (EA, xattr) to provide "...enhanced compatibility with Apple SMB clients and interoperability with a Netatalk 3 AFP fileserver." Samba versions prior to 4.13.17, 4.14.12 and 4.15.5 with vfs_fruit configured allow out-of-bounds heap read and write via specially crafted extended file attributes. A remote attacker with write access to extended file attributes can execute arbitrary code with the privileges of smbd, typically root.

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)