Attachment 17354 Details for Bug 15074 – Advisory draft #1

Advisory draft #1

advisory.txt (text/plain), 2.19 KB, created by Jennifer Sutton on 2022-06-15 09:57:47 UTC

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Creator: Jennifer Sutton

Created: 2022-06-15 09:57:47 UTC

Size: 2.19 KB

patch

obsolete

>===========================================================
>== Subject:     Samba AD users can forge password change requests for
>==              any user.
>==
>== CVE ID#:     CVE-2022-32744
>==
>== Versions:    Samba 4.3 and later
>==
>== Summary:     The KDC accepts kpasswd requests encrypted with any
>==              key known to it. By encrypting forged kpasswd requests
>==              with its own key, a user can change the passwords of
>==              other users, enabling full domain takeover.
>===========================================================
>
>===========
>Description
>===========
>
>Tickets received by the kpasswd service were decrypted without
>specifying that only that service's own keys should be tried. By
>setting the ticket's server name to a principal associated with their
>own account, or by exploiting a fallback where known keys would be
>tried until a suitable one was found, an attacker could have the
>server accept tickets encrypted with any key, including their own.
>
>A user could thus change the password of the Administrator account and
>gain total control over the domain. Full loss of confidentiality and
>integrity would be possible, as well as of availability by denying
>users access to their accounts.
>
>In addition, the kpasswd service would accept tickets encrypted by the
>krbtgt key of an RODC, in spite of the fact that RODCs should not have
>been able to authorise password changes.
>
>==================
>Patch Availability
>==================
>
>Patches addressing this issue have been posted to:
>
>    https://www.samba.org/samba/security/
>
>Additionally, Samba 4.14.next, 4.15.next, and 4.16.next 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
>=======
>
>Initial report, 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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