[CLA-2001:405] Conectiva Linux Security Announcement - samba
Date: Sat, 23 Jun 2001 20:33:35 -0300
From: [email protected]
To: [email protected], [email protected],
Subject: [CLA-2001:405] Conectiva Linux Security Announcement - samba
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CONECTIVA LINUX SECURITY ANNOUNCEMENT
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PACKAGE : samba
SUMMARY : Remote root vulnerability
DATE : 2001-06-23 19:55:00
ID : CLA-2001:405
RELEVANT
RELEASES : 4.0, 4.0es, 4.1, 4.2, 5.0, prg graficos, ecommerce, 5.1, 6.0
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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).
Michal Zalewski reported a remote vulnerability that could be used to
gain root privileges on the samba server.
A remote attacker can set the NetBIOS name of his machine to almost
any name. This string will be used in place of "%m" in the
/etc/smb.conf configuration file. This can be used to append data
that is under the attacker's control to any file on the system
depending on how the "%m" macro is used.
The published exploit relies on the "log file" directive as found in
some configurations:
log file = /var/log/samba/%m.log
An attacker could abuse this configuration, which is *not* the
default on Conectiva Linux, and set, for example, "../../../tmp/x" as
his NetBIOS name. This would trick samba into appending data to a
"/tmp/x.log" file. If this file is a symbolic link, it will be
followed. There is a limit of 16 characters for the NetBIOS name, so
most attacks would probably rely on a symbolic link in /tmp or, if
the "%m" macro is used alone (such as "/var/log/samba/%m"), then any
file in a directory close to root (such as /bin/ls).
The default configuration of "log file" in Conectiva Linux does not
allow this kind of attack:
log file = /var/log/samba/log.%m
SOLUTION
All samba users should upgrade their packages immediately. In the
meantime, administrators should check their /etc/smb.conf
configuration file for "%m" and either substitute this macro or
remove it until the update can be applied.
This update will automatically restart the samba service if it's
already running.
REFERENCES:
1. http://us1.samba.org/samba/whatsnew/macroexploit.html
DIRECT DOWNLOAD LINKS TO THE UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/4.0/SRPMS/samba-2.0.9-2U40_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/4.0/i386/samba-2.0.9-2U40_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.0/i386/samba-clients-2.0.9-2U40_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.0/i386/samba-doc-2.0.9-2U40_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.0/i386/samba-swat-2.0.9-2U40_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.0es/SRPMS/samba-2.0.9-2U40_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/4.0es/i386/samba-2.0.9-2U40_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.0es/i386/samba-clients-2.0.9-2U40_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.0es/i386/samba-doc-2.0.9-2U40_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.0es/i386/samba-swat-2.0.9-2U40_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.1/SRPMS/samba-2.0.9-2U41_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/4.1/i386/samba-2.0.9-2U41_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.1/i386/samba-clients-2.0.9-2U41_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.1/i386/samba-doc-2.0.9-2U41_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.1/i386/samba-swat-2.0.9-2U41_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.2/SRPMS/samba-2.0.9-2U42_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/4.2/i386/samba-2.0.9-2U42_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.2/i386/samba-clients-2.0.9-2U42_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.2/i386/samba-doc-2.0.9-2U42_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/4.2/i386/samba-swat-2.0.9-2U42_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.0/SRPMS/samba-2.0.9-2U50_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/5.0/i386/samba-2.0.9-2U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.0/i386/samba-clients-2.0.9-2U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.0/i386/samba-doc-2.0.9-2U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.0/i386/samba-swat-2.0.9-2U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.1/SRPMS/samba-2.0.9-2U51_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/5.1/i386/samba-2.0.9-2U51_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.1/i386/samba-clients-2.0.9-2U51_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.1/i386/samba-doc-2.0.9-2U51_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/5.1/i386/samba-swat-2.0.9-2U51_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/SRPMS/samba-2.0.9-2U60_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/samba-2.0.9-2U60_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/samba-clients-2.0.9-2U60_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/samba-doc-2.0.9-2U60_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/samba-swat-2.0.9-2U60_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/ecommerce/SRPMS/samba-2.0.9-2U50_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/ecommerce/i386/samba-2.0.9-2U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/ecommerce/i386/samba-clients-2.0.9-2U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/ecommerce/i386/samba-doc-2.0.9-2U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/ecommerce/i386/samba-swat-2.0.9-2U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/graficas/SRPMS/samba-2.0.9-2U50_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/graficas/i386/samba-2.0.9-2U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/graficas/i386/samba-clients-2.0.9-2U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/graficas/i386/samba-doc-2.0.9-2U50_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/ferramentas/graficas/i386/samba-swat-2.0.9-2U50_1cl.i386.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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