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Test ID:1.3.6.1.4.1.25623.1.0.870763
Category:Red Hat Local Security Checks
Title:RedHat Update for openssh RHSA-2012:0884-04
Summary:The remote host is missing an update for the 'openssh'; package(s) announced via the referenced advisory.
Description:Summary:
The remote host is missing an update for the 'openssh'
package(s) announced via the referenced advisory.

Vulnerability Insight:
OpenSSH is OpenBSD's Secure Shell (SSH) protocol implementation. These
packages include the core files necessary for the OpenSSH client and
server.

A denial of service flaw was found in the OpenSSH GSSAPI authentication
implementation. A remote, authenticated user could use this flaw to make
the OpenSSH server daemon (sshd) use an excessive amount of memory, leading
to a denial of service. GSSAPI authentication is enabled by default
(GSSAPIAuthentication yes in /etc/ssh/sshd_config). (CVE-2011-5000)

These updated openssh packages also provide fixes for the following bugs:

* SSH X11 forwarding failed if IPv6 was enabled and the parameter
X11UseLocalhost was set to 'no'. Consequently, users could not set X
forwarding. This update fixes sshd and ssh to correctly bind the port for
the IPv6 protocol. As a result, X11 forwarding now works as expected with
IPv6. (BZ#732955)

* The sshd daemon was killed by the OOM killer when running a stress test.
Consequently, a user could not log in. With this update, the sshd daemon
sets its oom_adj value to -17. As a result, sshd is not chosen by OOM
killer and users are able to log in to solve problems with memory.
(BZ#744236)

* If the SSH server is configured with a banner that contains a backslash
character, then the client will escape it with another '\' character, so it
prints double backslashes. An upstream patch has been applied to correct
the problem and the SSH banner is now correctly displayed. (BZ#809619)

In addition, these updated openssh packages provide the following
enhancements:

* Previously, SSH allowed multiple ways of authentication of which only one
was required for a successful login. SSH can now be set up to require
multiple ways of authentication. For example, logging in to an SSH-enabled
machine requires both a passphrase and a public key to be entered. The
RequiredAuthentications1 and RequiredAuthentications2 options can be
configured in the /etc/ssh/sshd_config file to specify authentications that
are required for a successful login. For example, to set key and password
authentication for SSH version 2, type:

echo 'RequiredAuthentications2 publickey, password' >> /etc/ssh/sshd_config

For more information on the aforementioned /etc/ssh/sshd_config options,
refer to the sshd_config man page. (BZ#657378)

* Previously, OpenSSH could use the Advanced Encryption Standa ...

Description truncated, please see the referenced URL(s) for more information.

Affected Software/OS:
openssh on Red Hat Enterprise Linux Desktop (v. 6),
Red Hat Enterprise Linux Server (v. 6),
Red Hat Enterprise Linux Workstation (v. 6)

Solution:
Please Install the Updated Packages.

CVSS Score:
3.5

CVSS Vector:
AV:N/AC:M/Au:S/C:N/I:N/A:P

Cross-Ref: Common Vulnerability Exposure (CVE) ID: CVE-2011-5000
http://seclists.org/fulldisclosure/2011/Aug/2
http://site.pi3.com.pl/adv/ssh_1.txt
RedHat Security Advisories: RHSA-2012:0884
http://rhn.redhat.com/errata/RHSA-2012-0884.html
CopyrightCopyright (c) 2012 Greenbone Networks GmbH

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