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CentOS Update for openssh CESA-2009:1287 centos5 i386

Information

Severity

Severity

Low

Family

Family

CentOS Local Security Checks

CVSSv2 Base

CVSSv2 Base

2.6

CVSSv2 Vector

CVSSv2 Vector

AV:N/AC:H/Au:N/C:P/I:N/A:N

Solution Type

Solution Type

Vendor Patch

Created

Created

11 years ago

Modified

Modified

3 years ago

Summary

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

Insight

Insight

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.

Affected Software

Affected Software

openssh on CentOS 5

Solution

Solution

Please install the updated packages.

Common Vulnerabilities and Exposures (CVE)