Attachment 18094 Details for Bug 15474 – Initial Advisory without CVE (v1)

Initial Advisory without CVE (v1)

rpcecho-advisory-v1.txt (text/plain), 1.90 KB, created by Andrew Bartlett on 2023-09-12 09:31:46 UTC

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Creator: Andrew Bartlett

Created: 2023-09-12 09:31:46 UTC

Size: 1.90 KB

patch

obsolete

>===========================================================
>== Subject:     "rpcecho" development server allows Denial
>                of Service via sleep() call on AD DC
>==
>== CVE ID#:     
>==
>== Versions:    All versions of Samba since Samba 4.0.0
>==
>== Summary:     Calls to the rpcecho server on the AD DC can request
>                that the server block for a user-defined amount of
>                time, denying service.
>===========================================================
>
>===========
>Description
>===========
>
>Samba developers have built a non-Windows RPC server known as
>"rpcecho" to test elements of the Samba DCE/RPC stack under their full
>control.
>
>One RPC function provided by "rpcecho" can block, essentially
>indefinitely, and because the "rpcecho" service is provided from the
>main RPC task, which has only one worker, this denies essentially all
>service on the AD DC.
>
>To address this problem, the rpcecho server is removed from our
>production binaries and is restricted to selftest builds only.
>
>==================
>Patch Availability
>==================
>
>Patches addressing both these issues have been posted to:
>
>    https://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:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H (6.5)
>
>==========
>Workaround
>==========
>
>Setting "dcerpc endpoint servers = -rpcecho" will disable the rpcecho
>service.
>
>=======
>Credits
>=======
>
>Originally reported by Andrew Bartlett of Catalyst and the Samba Team.
>
>Patches provided by Andrew Bartlett of Catalyst and the Samba Team.
>
>==========================================================
>== Our Code, Our Bugs, Our Responsibility.
>== The Samba Team
>==========================================================
>

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