Attachment 14567 Details for Bug 13674 – security advisory text

security advisory text

BUG-13674.txt (text/plain), 1.86 KB, created by Andrew Bartlett on 2018-11-05 22:20:23 UTC

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Creator: Andrew Bartlett

Created: 2018-11-05 22:20:23 UTC

Size: 1.86 KB

patch

obsolete

>===========================================================
>== Subject:  NULL pointer de-reference in Samba AD DC LDAP server
>==
>== CVE ID#:  CVE-2018-16851
>==
>== Versions: All versions of Samba from 4.0.0 onwards.
>==
>== Summary:  A user able to read more than 256MB of LDAP entires
>             can crash the Samba AD DC's LDAP server.
>===========================================================
>
>===========
>Description
>===========
>
>During the processing of an LDAP search before Samba's AD DC returns
>the LDAP entries to the client, the entries are cached in a single
>memory object with a maximum size of 256MB.  When this size is
>reached, the Samba process providing the LDAP service will follow the
>NULL pointer, terminating the process.
>
>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.
>
>=========================
>Workaround and mitigation
>=========================
>
>When Samba 4.7 (or later) is started in the default 'standard' process
>model only the process used for the connection back to the attacker's
>client crashes.
>
>By default anonymous access is only available to the rootDSE (server
>metadata), so only authenticated users can read large volumes of data.
>
>=======
>Credits
>=======
>
>Originally reported by Garming Sam of the Samba Team and Catalyst
>
>Patches provided by Garming Sam of the Samba Team and Catalyst.
>
>==========================================================
>== Our Code, Our Bugs, Our Responsibility.
>== The Samba Team
>==========================================================
>

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