[CLA-2002:502] Conectiva Linux Security Announcement - openssh
Date: Fri, 28 Jun 2002 15:28:56 -0300
From: [email protected]
To: [email protected], [email protected],
Subject: [CLA-2002:502] Conectiva Linux Security Announcement - openssh
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CONECTIVA LINUX SECURITY ANNOUNCEMENT
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PACKAGE : openssh
SUMMARY : Remote vulnerability in openssh
DATE : 2002-06-28 15:27:00
ID : CLA-2002:502
RELEVANT
RELEASES : 6.0, 7.0, 8
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DESCRIPTION
OpenSSH[1] is a very popular and versatile tool that uses encrypted
connections between hosts and is commonly used for remote
administration.
ISS[5] published[4] an advisory concerning a remote vulnerability in
OpenSSH that could be used by remote attackers to obtain root
privileges on the server where OpenSSH is running.
The vulnerability is present in two authentication mechanisms:
ChallengeResponse and PAMAuthenticationViaKbdInt. If these mechanisms
are not necessary in your installation, they can be disabled by the
following entries in /etc/ssh/sshd_config:
ChallengeResponseAuthentication no
PAMAuthenticationViaKbdInt no
Please note that any changes made to the sshd_config file require a
service restart to be effective.
To minimize the impact of this vulnerability the 3.3p1 version of
OpenSSH has been made available previously[2]. That version, which
still has this vulnerability, implements by default the
PrivilegeSeparation mechanism which greatly reduces the impact of
this and potential future vulnerabilities in OpenSSH. The 3.4p1
version of OpenSSH has now been made available and it includes fixes
for the reported vulnerabilities.
Even though the vulnerability is fixed in version 3.4p1, users are
still advised to keep using the PrivilegeSeparation feature. There
are, though, still a few problems with certain authentication methods
and PrivilegeSeparation that are expected to be solved in future
releases. Whenever appropriate, new packages will be provided as
bugfix advisories. In particular, the packages provided here contain
a patch from Solar Designer (from the Openwall Project[4]) which
allows the use of PrivilegeSeparation together with data compression
in 2.2 kernels. Next releases might not need this patch anymore.
If for some reason the use of PrivilegeSeparation is not possible in
some setup, it can be disabled via the following entry in
/etc/ssh/sshd_config:
UsePrivilegeSeparation no
SOLUTION
It is recommended that all OpenSSH users upgrade their packages.
The ssh service will be automatically restarted during the upgrade if
it is already running. Current ssh sessions will remain open during
the restart.
REFERENCES
1.http://www.openssh.com
2.http://distro.conectiva.com.br/atualizacoes/?id=a&anuncio=000500
3.http://www.cert.org/advisories/CA-2002-18.html
4.http://bvlive01.iss.net/issEn/delivery/xforce/alertdetail.jsp?oid=20584
5.http://www.iss.net/
6.http://www.openwall.com/Owl/
DIRECT DOWNLOAD LINKS TO THE UPDATED PACKAGES
ftp://atualizacoes.conectiva.com.br/6.0/SRPMS/openssh-3.4p1-1U60_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/openssh-3.4p1-1U60_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/openssh-askpass-3.4p1-1U60_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/openssh-askpass-gnome-3.4p1-1U60_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/openssh-clients-3.4p1-1U60_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/6.0/RPMS/openssh-server-3.4p1-1U60_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/SRPMS/openssh-3.4p1-1U70_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/openssh-3.4p1-1U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/openssh-askpass-3.4p1-1U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/openssh-askpass-gnome-3.4p1-1U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/openssh-clients-3.4p1-1U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/7.0/RPMS/openssh-server-3.4p1-1U70_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/SRPMS/openssh-3.4p1-1U8_1cl.src.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/openssh-3.4p1-1U8_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/openssh-askpass-3.4p1-1U8_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/openssh-askpass-gnome-3.4p1-1U8_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/openssh-clients-3.4p1-1U8_1cl.i386.rpm
ftp://atualizacoes.conectiva.com.br/8/RPMS/openssh-server-3.4p1-1U8_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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subscribe: [email protected]
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