Attachment 17108 Details for Bug 14950 – advisory v3

advisory v3

advisory-v3.txt (text/plain), 2.04 KB, created by Douglas Bagnall on 2022-01-21 01:19:57 UTC

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Creator: Douglas Bagnall

Created: 2022-01-21 01:19:57 UTC

Size: 2.04 KB

patch

obsolete

>===========================================================
>== Subject:     Samba AD users with permission to write to
>==              an account can impersonate arbitrary services.
>==
>== CVE ID#:
>==
>== Versions:    Samba 4.0.0 and later
>==
>== Summary:     Checks in the Samba AD DC to prevent aliased
>==              SPNs could be bypassed, giving users who can
>==              write to an account's servicePrincipalName
>==              attribute the ability to impersonate services.
>===========================================================
>
>===========
>Description
>===========
>
>The Samba AD DC includes checks when adding service principals names
>(SPNs) to an account to ensure that SPNs do not alias with those
>already in the database. Some of these checks are able to be bypassed
>if an account modification re-adds an SPN that was previously present
>on that account, such as one added when a computer is joined to a
>domain.
>
>An attacker who has the ability to write to an account can exploit
>this to perform a denial-of-service attack by adding an SPN that
>matches an existing service. Additionally, an attacker who can
>intercept traffic can impersonate existing services, resulting in a
>loss of confidentiality and integrity.
>
>==================
>Patch Availability
>==================
>
>Patches addressing both these issues have been posted to:
>
>    https://www.samba.org/samba/security/
>
>Additionally, Samba 4.13.17, 4.14.12, and 4.15.4 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
>==================
>
>CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H (8.8)
>
>==========
>Workaround
>==========
>
>None.
>
>=======
>Credits
>=======
>
>Originally reported by Kees van Vloten.
>
>Analysis, patches, and this advisory by Joseph Sutton of Catalyst
>and the Samba Team.
>
>==========================================================
>== Our Code, Our Bugs, Our Responsibility.
>== The Samba Team
>==========================================================

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