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Subject:  Samba 3.0.x Denial of Service Flaw

Summary:  (i) A DoS bug in smbd may allow an
    unauthenticated user to cause smbd to
    spawn new processes each one entering
    an infinite loop.  After sending a sufficient
    amount of packets it is possible to exhaust
    the memory resources on the server.

    (ii) A DoS bug in nmbd may allow an attacker
    to remotely crash the nmbd daemon.

Affected
Versions:  Defect (i) affects Samba 3.0.x prior to and
    including v3.0.6.

    Defect (ii) affects Samba 3.0.x prior to
    and including v3.0.6.

Patch
Availability:  The patch file for Samba 3.0.5 addressing both
    bugs (samba-3.0.5-DoS.patch) can be downloaded
    from
    http://download.samba.org/samba/ftp/patches/security/


Description
- -----------

CAN-2004-0807: A defect in smbd's ASN.1 parsing allows an
attacker to send a specially crafted packet during the
authentication request which will send the newly spawned
smbd process into an infinite loop.  Given enough of these
packets, it is possible to exhaust the available memory
on the server.

CAN-2004-0808: A defect in nmbd's process of mailslot packets
can allow an attacker to anonymously crash nmbd.


Protecting Unpatched Servers
- ----------------------------

The Samba Team always encourages users to run the latest stable
release as a defense of against attacks.  However, under certain
circumstances it may not be possible to immediately upgrade
important installations.  In such cases, administrators should
read the "Server Security" documentation found at
http://www.samba.org/samba/docs/server_security.html.


Credits
- --------

Both security issues were reported to Samba developers by
iDEFENSE (http://www.idefense.com/).  The defect discovery
was anonymously reported to iDEFENSE via their Vulnerability
Contributor Program (http://www.idefense.com/poi/teams/vcp.jsp).


- --
Our Code, Our Bugs, Our Responsibility.


        -- The Samba Team


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