Attachment 15168 Details for Bug 13922 – first draft security advisory

first draft security advisory

dnsserver-sec-advisory.txt (text/plain), 1.79 KB, created by Andrew Bartlett on 2019-05-19 22:29:39 UTC

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Creator: Andrew Bartlett

Created: 2019-05-19 22:29:39 UTC

Size: 1.79 KB

patch

obsolete

>===========================================================
>== Subject:     Samba AD DC Denial of Service in DNS management server (dnsserver)
>==
>== CVE ID#:     
>==
>== Versions:    All versions of the Samba AD DC (that is Samba 4.0 and later)
>==
>== Summary:     An authenticated user can crash the Samba AD DC's
>                RPC server process via a NULL pointer de-reference.
>
>===========================================================
>
>===========
>Description
>===========
>
>The (poorly named) dnsserver RPC pipe provides administrative
>facilities to modify DNS records and zones.
>
>An authenticated user can crash the RPC server process via a
>NULL pointer de-reference.
>
>There is no further vulnerability associated with this issue, merely a
>denial of service.
>
>==================
>Patch Availability
>==================
>
>Patches addressing both these issues have been posted to:
>
>    http://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
>==================
>
>CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H (6.5)
>
>==========
>Workaround
>==========
>
>The dnsserver task can be stopped by setting 
> 'dcerpc endpoint servers = -dnsserver'
>in the smb.conf and restarting Samba. 
>
>=======
>Credits
>=======
>
>Originally reported by Coverity as CID, and triaged by 
>Douglas Bagnall of Catalyst and the Samba Team.
>
>Advisory by Andrew Bartlett of Catalyst and the Samba Team.
>
>Patches provided by Douglas Bagnall of Catalyst and the Samba Team.
>
>==========================================================
>== Our Code, Our Bugs, Our Responsibility.
>== The Samba Team
>==========================================================
>

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