RHSA-2007:0257 - Security Advisory

Topic

Updated openssh packages that fix a security issue and various bugs are now
available.

This update has been rated as having low security impact by the Red Hat
Security Response Team.

Description

OpenSSH is OpenBSD's SSH (Secure SHell) protocol implementation. This
package includes the core files necessary for both the OpenSSH client and
server.

OpenSSH stores hostnames, IP addresses, and keys in plaintext in the
known_hosts file. A local attacker that has already compromised a user's
SSH account could use this information to generate a list of additional
targets that are likely to have the same password or key. (CVE-2005-2666)

The following bugs have also been fixed in this update:

• The ssh client could abort the running connection when the server

application generated a large output at once.

• When 'X11UseLocalhost' option was set to 'no' on systems with IPv6

networking enabled, the X11 forwarding socket listened only for IPv6
connections.

• When the privilege separation was enabled in /etc/ssh/sshd_config, some

log messages in the system log were duplicated and also had timestamps from
an incorrect timezone.

All users of openssh should upgrade to these updated packages, which
contain backported patches to correct these issues.

Solution

Before applying this update, make sure that all previously-released
errata relevant to your system have been applied. Use Red Hat
Network to download and update your packages. To launch the Red Hat
Update Agent, use the following command:

up2date

For information on how to install packages manually, refer to the
following Web page for the System Administration or Customization
guide specific to your system:

http://www.redhat.com/docs/manuals/enterprise/

Affected Products

• Red Hat Enterprise Linux Server 4 x86_64
• Red Hat Enterprise Linux Server 4 ia64
• Red Hat Enterprise Linux Server 4 i386
• Red Hat Enterprise Linux Workstation 4 x86_64
• Red Hat Enterprise Linux Workstation 4 ia64
• Red Hat Enterprise Linux Workstation 4 i386
• Red Hat Enterprise Linux Desktop 4 x86_64
• Red Hat Enterprise Linux Desktop 4 i386
• Red Hat Enterprise Linux for IBM z Systems 4 s390x
• Red Hat Enterprise Linux for IBM z Systems 4 s390
• Red Hat Enterprise Linux for Power, big endian 4 ppc

Fixes

• BZ - 162681 - CVE-2005-2666 openssh vulnerable to known_hosts address harvesting
• BZ - 184357 - buffer_append_space: alloc not supported Error
• BZ - 193710 - [PATCH] audit patch for openssh missing #include "loginrec.h" in auth.c
• BZ - 201594 - sshd does not create ipv4 listen socket for X11 forwarding
• BZ - 203671 - additional (time skewed) log entries in /var/log/secure since U4

CVEs

• CVE-2005-2666

References

• http://www.redhat.com/security/updates/classification/#low