Security update for OpenSSH
(Last modified: 16SEP2003)
solutions Security update for OpenSSH SuSE Linux Maintenance Web (a1b94c8b5da0188997516c960ed592d1)
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The package is installed on most SuSE products, and the SSH dÆmon (sshd, the ssh server) is activated by default on most SuSE systems to allow for secure remote administration of a system.
A coding error has been found in all currently supported versions of the OpenSSH package. This error may result in a vulnerability that may allow a remote attacker to execute arbitrary commands on the system running the
sshdSSH server. It is yet unclear if the bugs discovered can be exploited by a remote attacker - however, an increasing amount of TCP connection attempts to the SSH port (22) has been noticed during the last few days. This may indicate that an exploit exists on the Internet.
The potential vulnerability is known as the
buffer_append_space()bug and is assigned the Common Vulnerabilities and Exposures project name CAN-2003-0693.
In addition to the fix for the
buffer_append_space()bug, this update turns off the Privilege Separation feature (See the option
sshdglobal configuration file
/etc/ssh/sshd_config). The feature was to blame for various inconsistencies in PAM authentication mechanisms and features that are incompatible with the Privilege Separation feature. If you have modified the
sshd_configfile that comes with the package, your configuration will not get overwritten by the update package.
It is highly recommended to install this update package on all systems that have an OpenSSH dÆmon (
rpm -Fvh openssh.rpm
After performing the update, it is necessary to restart the
sshdsecure shell dÆmon. To do this, run the following command as user
Already running instances with established (legitimate) ssh connections should not be influenced and should continue to run.
Download Source Packages
Download the source code of the patches for maintained products.
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