Buffer overflow vulnerability

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CONECTIVA LINUX SECURITY ANNOUNCEMENT
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PACKAGE : samba
SUMMARY : Buffer overflow vulnerability
DATE : 2002-11-22 16:13:00
ID : CLA-2002:550
RELEVANT
RELEASES : 6.0, 7.0, 8

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DESCRIPTION
Samba is a server that provides SMB services such as file and printer
sharing for other SMB clients, such as Windows(R).

Steve Langasek and Eloy Paris discovered a vulnerability in Samba
versions 2.2.2 to 2.2.6 which may allow a remote attacker to execute
arbitrary code in the server context. The vulnerability, which is a
buffer overflow in a function used to decrypt hashed passwords, can
be exploited by an attacker when authenticating a valid account in
the samba server. In order to sucessfully run arbitrary code, the
overflow must be crafted such that converting a DOS codepage string
to little endian UCS2 unicode translates into an executable block of
code.

This update also adds other fixes for potential buffer overflows from
samba 2.2.7 that are not part of the standard patch supplied by the
samba authors in their announcement[1]. The samba package distributed
in Conectiva Linux 6.0 (samba-2.0.9) is not vulnerable to the
announced buffer overflow, but it is being upgraded with these
aditional fixes.


SOLUTION
All samba users should upgrade their packages immediately. This
update will automatically restart the samba service if it is already
running.


REFERENCES:
1.http://us1.samba.org/samba/whatsnew/samba-2.2.7.html


DIRECT DOWNLOAD LINKS TO THE UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/samba-2.0.9-2U60_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/samba-clients-2.0.9-2U60_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/samba-doc-2.0.9-2U60_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/samba-swat-2.0.9-2U60_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/SRPMS/samba-2.0.9-2U60_2cl.src.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/samba-2.2.1a-1U70_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/samba-clients-2.2.1a-1U70_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/samba-codepagesource-2.2.1a-1U70_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/samba-common-2.2.1a-1U70_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/samba-doc-2.2.1a-1U70_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/samba-swat-2.2.1a-1U70_2cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/samba-2.2.1a-1U70_2cl.src.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/samba-2.2.3a-2U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/samba-clients-2.2.3a-2U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/samba-codepagesource-2.2.3a-2U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/samba-common-2.2.3a-2U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/samba-doc-2.2.3a-2U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/samba-swat-2.2.3a-2U80_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/SRPMS/samba-2.2.3a-2U80_1cl.src.rpm


ADDITIONAL INSTRUCTIONS
Users of Conectiva Linux version 6.0 or higher may use apt to perform
upgrades of RPM packages:
- add the following line to /etc/apt/sources.list if it is not there yet
(you may also use linuxconf to do this):

rpm [cncbr] ftp://atualizacoes.conectiva.com.br 6.0/conectiva updates

(replace 6.0 with the correct version number if you are not running CL6.0)

- run: apt-get update
- after that, execute: apt-get upgrade

Detailed instructions reagarding the use of apt and upgrade examples
can be found at http://distro.conectiva.com.br/atualizacoes/#apt?idioma=en


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All packages are signed with Conectiva's GPG key. The key and instructions
on how to import it can be found at
http://distro.conectiva.com.br/seguranca/chave/?idioma=en
Instructions on how to check the signatures of the RPM packages can be
found at http://distro.conectiva.com.br/seguranca/politica/?idioma=en
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All our advisories and generic update instructions can be viewed at
http://distro.conectiva.com.br/atualizacoes/?idioma=en

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