Attachment 17812 Details for Bug 15276 – Advisory v4

Advisory v4

CVE-2023-0225-dnsHostName-delete-v4.txt (text/plain), 2.14 KB, created by Andrew Bartlett on 2023-03-13 22:15:20 UTC

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Creator: Andrew Bartlett

Created: 2023-03-13 22:15:20 UTC

Size: 2.14 KB

patch

obsolete

>===========================================================
>== Subject:     Samba AD DC "dnsHostname" attribute can be
>                deleted by unprivileged authenticated users.
>==
>== CVE ID#:     CVE-2023-0225
>==
>== Versions:    Samba 4.17.0 and later versions
>==
>== Summary:     An incomplete access check on dnsHostName allows
>                authenticated but otherwise unprivileged users to
>                delete this attribute from any object in the directory.
>===========================================================
>
>===========
>Description
>===========
>
>In implementing the Validated dnsHostName permission check in Samba's
>Active Directory DC, and therefore applying correctly constraints on
>the values of a dnsHostName value for a computer in a Samba domain
>(CVE-2022-32743), the case where the dnsHostName is deleted, rather
>than modified or added, was incorrectly handled.
>
>Therefore, in Samba 4.17.0 and later an LDAP attribute value deletion
>of the dnsHostName attribute became possible for authenticated but
>otherwise unprivileged users, for any object.
>
>==================
>Patch Availability
>==================
>
>Patches addressing both these issues have been posted to:
>
>    https://www.samba.org/samba/security/
>
>Additionally, Samba $VERSIONS have been issued
>as security releases to correct the defect.  Samba administrators are
>advised to upgrade to these releases or apply the patch as soon
>as possible.
>
>==================
>CVSSv3 calculation
>==================
>
>CVSS3.1:AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L (5.4)
>
>==========
>Workaround
>==========
>
>The AD DC LDAP server is a critical component of the AD DC, and it
>should not be disabled.  However it can be disabled by setting
>
> server services = -ldap
>
>in the smb.conf and restarting Samba
>
>=======
>Credits
>=======
>
>Originally reported by Lukas Mitter of codemanufaktur GmbH.
>
>Patches provided by Joseph Sutton and Douglas Bagnall of Catalyst
>and the Samba Team.
>
>Advisory prepared by Andrew Bartlett of Catalyst and the Samba Team.
>
>==========================================================
>== Our Code, Our Bugs, Our Responsibility.
>== The Samba Team
>==========================================================
>

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