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CentOS 5 : openssh (CESA-2009:1287)
low Nessus Plugin ID 43781
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Synopsis
The remote CentOS host is missing one or more security updates.Description
Updated openssh packages that fix a security issue, a bug, and add enhancements are now available for Red Hat Enterprise Linux 5.This update has been rated as having low security impact by the Red Hat Security Response Team.
OpenSSH is OpenBSD's SSH (Secure Shell) protocol implementation. These packages include the core files necessary for both the OpenSSH client and server.
A flaw was found in the SSH protocol. An attacker able to perform a man-in-the-middle attack may be able to obtain a portion of plain text from an arbitrary ciphertext block when a CBC mode cipher was used to encrypt SSH communication. This update helps mitigate this attack:
OpenSSH clients and servers now prefer CTR mode ciphers to CBC mode, and the OpenSSH server now reads SSH packets up to their full possible length when corruption is detected, rather than reporting errors early, reducing the possibility of successful plain text recovery.
(CVE-2008-5161)
This update also fixes the following bug :
* the ssh client hung when trying to close a session in which a background process still held tty file descriptors open. With this update, this so-called 'hang on exit' error no longer occurs and the ssh client closes the session immediately. (BZ#454812)
In addition, this update adds the following enhancements :
* the SFTP server can now chroot users to various directories, including a user's home directory, after log in. A new configuration option -- ChrootDirectory -- has been added to '/etc/ssh/sshd_config' for setting this up (the default is not to chroot users). Details regarding configuring this new option are in the sshd_config(5) manual page. (BZ#440240)
* the executables which are part of the OpenSSH FIPS module which is being validated will check their integrity and report their FIPS mode status to the system log or to the terminal. (BZ#467268, BZ#492363)
All OpenSSH users are advised to upgrade to these updated packages, which contain backported patches to resolve these issues and add these enhancements. After installing this update, the OpenSSH server daemon (sshd) will be restarted automatically.
Solution
Update the affected openssh packages.See Also
Plugin Details
Severity: Low
ID: 43781
File Name: centos_RHSA-2009-1287.nasl
Version: 1.16
Type: local
Agent: unix
Family: CentOS Local Security Checks
Published: 1/6/2010
Updated: 1/4/2021
Supported Sensors: Agentless Assessment, Continuous Assessment, Frictionless Assessment Agent, Frictionless Assessment AWS, Frictionless Assessment Azure, Nessus
Risk Information
VPR
Risk Factor: Low
Score: 3.4
CVSS v2
Risk Factor: Low
Base Score: 2.6
Temporal Score: 1.9
Vector: CVSS2#AV:N/AC:H/Au:N/C:P/I:N/A:N
Vulnerability Information
CPE: p-cpe:/a:centos:centos:openssh-server, p-cpe:/a:centos:centos:openssh-clients, p-cpe:/a:centos:centos:openssh-askpass, p-cpe:/a:centos:centos:openssh, cpe:/o:centos:centos:5
Required KB Items: Host/local_checks_enabled, Host/CentOS/release, Host/CentOS/rpm-list
Exploit Ease: No known exploits are available
Patch Publication Date: 9/15/2009
Vulnerability Publication Date: 11/19/2008
Reference Information
CVE: CVE-2008-5161
BID: 32319