RHEL 6 : kexec-tools (RHSA-2011:1532)

This script is Copyright (C) 2011-2014 Tenable Network Security, Inc.


Synopsis :

The remote Red Hat host is missing one or more security updates.

Description :

An updated kexec-tools package that fixes three security issues,
various bugs, and adds enhancements is now available for Red Hat
Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having
moderate security impact. Common Vulnerability Scoring System (CVSS)
base scores, which give detailed severity ratings, are available for
each vulnerability from the CVE links in the References section.

Kexec allows for booting a Linux kernel from the context of an already
running kernel.

Kdump used the SSH (Secure Shell) 'StrictHostKeyChecking=no' option
when dumping to SSH targets, causing the target kdump server's SSH
host key not to be checked. This could make it easier for a
man-in-the-middle attacker on the local network to impersonate the
kdump SSH target server and possibly gain access to sensitive
information in the vmcore dumps. (CVE-2011-3588)

mkdumprd created initrd files with world-readable permissions. A local
user could possibly use this flaw to gain access to sensitive
information, such as the private SSH key used to authenticate to a
remote server when kdump was configured to dump to an SSH target.
(CVE-2011-3589)

mkdumprd included unneeded sensitive files (such as all files from the
'/root/.ssh/' directory and the host's private SSH keys) in the
resulting initrd. This could lead to an information leak when initrd
files were previously created with world-readable permissions. Note:
With this update, only the SSH client configuration, known hosts
files, and the SSH key configured via the newly introduced sshkey
option in '/etc/kdump.conf' are included in the initrd. The default is
the key generated when running the 'service kdump propagate' command,
'/root/.ssh/kdump_id_rsa'. (CVE-2011-3590)

Red Hat would like to thank Kevan Carstensen for reporting these
issues.

This update also fixes several bugs and adds various enhancements.
Space precludes documenting all of these changes in this advisory.
Documentation for these bug fixes and enhancements will be available
shortly from the Technical Notes document, linked to in the References
section.

All kexec-tools users should upgrade to this updated package, which
contains backported patches to resolve these issues and add these
enhancements.

See also :

https://www.redhat.com/security/data/cve/CVE-2011-3588.html
https://www.redhat.com/security/data/cve/CVE-2011-3589.html
https://www.redhat.com/security/data/cve/CVE-2011-3590.html
https://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/
http://rhn.redhat.com/errata/RHSA-2011-1532.html

Solution :

Update the affected kexec-tools and / or kexec-tools-debuginfo
packages.

Risk factor :

Medium / CVSS Base Score : 5.7
(CVSS2#AV:A/AC:M/Au:N/C:C/I:N/A:N)
CVSS Temporal Score : 5.0
(CVSS2#E:ND/RL:OF/RC:C)
Public Exploit Available : true

Family: Red Hat Local Security Checks

Nessus Plugin ID: 57013 ()

Bugtraq ID: 50415
50416
50420

CVE ID: CVE-2011-3588
CVE-2011-3589
CVE-2011-3590