Attachment 15227 Details for Bug 13951 – Updated Advisory (v01)

Updated Advisory (v01)

CVE-2019-12436-advisory-01.txt (text/plain), 2.32 KB, created by Andrew Bartlett on 2019-06-08 08:27:20 UTC

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Creator: Andrew Bartlett

Created: 2019-06-08 08:27:20 UTC

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>===========================================================
>== Subject:     Samba AD DC LDAP server crash (VLV and paged searches)
>==
>== CVE ID#:     CVE-2019-12436
>==
>== Versions:    All versions of Samba since Samba 4.10.0
>==
>== Summary:     A user with read access to the directory can
>                cause a NULL pointer dereference using the
>                paged search control.
>===========================================================
>
>===========
>Description
>===========
>
>A user with read access to the LDAP server can crash the LDAP
>server process.  Depending on the Samba version and the choice
>of process model, this may crash only the user's own connection.
>
>Specifically, while in Samba 4.10 the default is for one process per
>connected client, site-specific configuration trigger can change
>this.
>
>Samba 4.10 also supports the 'prefork' process model and by
>using the -M option to 'samba' and a 'single' process model.
>Both of these share on process between multiple clients.
>
>NOTE WELL: the original report on this issue to the Samba Team
>suggested a correlation between this NULL pointer de-reference with
>access to the \\DC\homes share on an AD DC, including a persistent
>service failure.  The Samba Team has been unable to corroborate this
>failure mode, and has instead focused on addressing the original
>issue.
>
>==================
>Patch Availability
>==================
>
>Patches addressing both these issues have been posted to:
>
>    http://www.samba.org/samba/security/
>
>Additionally, Samba 4.10.5 has been issued as a security release to
>correct the defect.  Samba administrators are advised to upgrade to
>this release or apply the patch as soon as possible.
>
>==================
>CVSSv3 calculation
>==================
>
>CVSS:3.0/CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H (6.5)
>
>==========
>Workaround
>==========
>
>Return to the default configuration by running 'samba' with -M 
>standard, however this may consume more memory and would not address
>the \\DC\homes issue.
>
>=======
>Credits
>=======
>
>Originally reported by Zombie Ryushu.
>
>Patches provided by Douglas Bagnall of Catalyst and the Samba team.
>Advisory written by Andrew Bartlett of Catalyst and the Samba team.
>
>==========================================================
>== Our Code, Our Bugs, Our Responsibility.
>== The Samba Team
>==========================================================
>

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