CentOS Update for openssh CESA-2012:0884 centos6

Published: 2012-07-30 11:06:31
CVE Author: NIST National Vulnerability Database

CVSS Base Vector:

The remote host is missing an update for the 'openssh' Linux Distribution Package(s) announced via the referenced advisory.

Affected Versions:
openssh on CentOS 6

Please install the updated Linux Distribution Packages.

Technical Details:
OpenSSH is OpenBSD's Secure Shell (SSH) protocol implementation. These Linux Distribution 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 Linux Distribution 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 Linux Distribution 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 Standard New Instructions (AES-NI) instruction set only with the AES Cipher-block chaining (CBC) cipher. This update adds ... Description truncated, please see the referenced URL(s) for more information.

Detection Type:
Linux Distribution Package

Solution Type:
Vendor Patch

NIST (National Institute of Standards and Technology) NVD (National Vulnerability Database)




CVSS Score
CentOS Local Security Checks

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