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Test ID:
Category:Conectiva Local Security Checks
Title:Conectiva Security Advisory CLA-2002:502
Summary:Conectiva Security Advisory CLA-2002:502

The remote host is missing updates announced in
advisory CLA-2002:502.

OpenSSH[1] is a very popular and versatile tool that uses encrypted
connections between hosts and is commonly used for remote

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

UsePrivilegeSeparation no

The apt tool can be used to perform RPM package upgrades
by running 'apt-get update' followed by 'apt-get upgrade'


Risk factor : High

CopyrightCopyright (c) 2005 E-Soft Inc. http://www.securityspace.com

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