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CVE-2021-43566

Published: 11 January 2022

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.

Mitigation

This issue can be mitigated by disabling SMB1, which is the default
configuration in Samba 4.11 and above. In environments where SMB1 cannot
be disabled, symlink support can be disabled with unix extensions = no.

Priority

Low

Cvss 3 Severity Score

2.5

Score breakdown

Status

Package Release Status
samba
Launchpad, Ubuntu, Debian
jammy
Released (4.13.17~dfsg-0ubuntu1)
kinetic
Released (4.13.17~dfsg-0ubuntu1)
trusty Needs triage

xenial Needs triage

bionic Needed

upstream
Released (4.13.16)
focal
Released (2:4.13.17~dfsg-0ubuntu0.21.04.1)
hirsute Ignored
(end of life)
impish
Released (2:4.13.17~dfsg-0ubuntu0.21.10.1)
lunar
Released (4.13.17~dfsg-0ubuntu1)
mantic
Released (4.13.17~dfsg-0ubuntu1)

Severity score breakdown

Parameter Value
Base score 2.5
Attack vector Local
Attack complexity High
Privileges required Low
User interaction None
Scope Unchanged
Confidentiality None
Integrity impact Low
Availability impact None
Vector CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N