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Security Advisory Moderate: kexec-tools security, bug fix, and enhancement update

Advisory: RHSA-2012:0152-3
Type: Security Advisory
Severity: Moderate
Issued on: 2012-02-21
Last updated on: 2012-02-21
Affected Products: Red Hat Enterprise Linux (v. 5 server)
Red Hat Enterprise Linux Desktop (v. 5 client)
CVEs (cve.mitre.org): CVE-2011-3588
CVE-2011-3589
CVE-2011-3590

Details

An updated kexec-tools package that resolves three security issues,
fixes several bugs and adds various enhancements is now available for
Red Hat Enterprise Linux 5.

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.

The kexec-tools package contains the /sbin/kexec binary and utilities that
together form the user-space component of the kernel's kexec feature. The
/sbin/kexec binary facilitates a new kernel to boot using the kernel's
kexec feature either on a normal or a panic reboot. The kexec fastboot
mechanism allows 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)

The mkdumprd utility 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)

The mkdumprd utility 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 updated kexec-tools package also includes numerous bug fixes and
enhancements. Space precludes documenting all of these changes in this
advisory. Users are directed to the Red Hat Enterprise Linux 5.8 Technical
Notes, linked to in the References, for information on the most significant
of these changes.

All users of kexec-tools are advised to upgrade to this updated package,
which resolves these security issues, fixes these bugs and adds these
enhancements.


Solution

Before applying this update, make sure all previously-released errata
relevant to your system have been applied.

This update is available via the Red Hat Network. Details on how to
use the Red Hat Network to apply this update are available at
https://access.redhat.com/kb/docs/DOC-11259

Updated packages

Red Hat Enterprise Linux (v. 5 server)

SRPMS:
kexec-tools-1.102pre-154.el5.src.rpm
File outdated by:  RHBA-2013:1321
    MD5: 84a3bde6702fd0b212fb4621f71a46fc
SHA-256: 2fa41532f1337d43b19ac26c18478bac1c5f18153f0343ea2a63e269828da043
 
IA-32:
kexec-tools-1.102pre-154.el5.i386.rpm
File outdated by:  RHBA-2013:1321
    MD5: 165ad57d399d6b3dc2ca7b6672d8fd02
SHA-256: f66caafc2862a1b33deee09a74655a7e7e5e0aac26a0b036c0dc714c056ecf1c
kexec-tools-debuginfo-1.102pre-154.el5.i386.rpm
File outdated by:  RHBA-2013:1321
    MD5: a2f8b134708a90932c9c79ca9e43c222
SHA-256: fd0e322cf5b41bf10a7c07690a344046add7e24e00b5e992000a3e7e491dd4fd
 
IA-64:
kexec-tools-1.102pre-154.el5.ia64.rpm
File outdated by:  RHBA-2013:1321
    MD5: 02003044229872ce7c313f9736775c98
SHA-256: acf589bdb572cd80bb670936eba320ad7f7f357788618b7d45c4640a622cd3ea
kexec-tools-debuginfo-1.102pre-154.el5.ia64.rpm
File outdated by:  RHBA-2013:1321
    MD5: fcffa3ff69b600cdcb648291a091b324
SHA-256: aa06acdb1008cab3aca28ccb2f39da8b0e2082a90cd67db817dfde08978bfdb3
 
PPC:
kexec-tools-1.102pre-154.el5.ppc64.rpm
File outdated by:  RHBA-2013:1321
    MD5: 81f62fc3d67c5bc83bee7bae65e9a662
SHA-256: 4f1af53f6d97f061cd6f9467fa23d757231d21f329d377ed11df88d3498621c8
kexec-tools-debuginfo-1.102pre-154.el5.ppc64.rpm
File outdated by:  RHBA-2013:1321
    MD5: e5d13dc2ae80a0a10367bda4052b6d0c
SHA-256: 6da7d33f9021333acc0828b26b73168b750d660f7032bd980a7bcb7d9738d0c9
 
s390x:
kexec-tools-1.102pre-154.el5.s390x.rpm
File outdated by:  RHBA-2013:1321
    MD5: 90d0da5d11503abf893109382c5f06d1
SHA-256: ebaa2a8423f585cae36e3f8d64a1dec1d5ba9f6a6ee33071cdc42e5b32eb3764
kexec-tools-debuginfo-1.102pre-154.el5.s390x.rpm
File outdated by:  RHBA-2013:1321
    MD5: 38b475ef603990254bc19b19676a9c8c
SHA-256: f23709c1e494e17b57f2af0449671a13b61fbf1a87afc220ae635d94da5367c0
 
x86_64:
kexec-tools-1.102pre-154.el5.x86_64.rpm
File outdated by:  RHBA-2013:1321
    MD5: b63403f2cdccb73beeba46f2ccdebb2f
SHA-256: be39a444d43e292309d76ba3149ac1afff7d915e3707c90d796de977977a723f
kexec-tools-debuginfo-1.102pre-154.el5.x86_64.rpm
File outdated by:  RHBA-2013:1321
    MD5: 1ffbae554e81ad010b4cb3bb897e03eb
SHA-256: b5802a23a6c01391609259c4dd4473e0b8294637984568c5493683780206ab42
 
Red Hat Enterprise Linux Desktop (v. 5 client)

SRPMS:
kexec-tools-1.102pre-154.el5.src.rpm
File outdated by:  RHBA-2013:1321
    MD5: 84a3bde6702fd0b212fb4621f71a46fc
SHA-256: 2fa41532f1337d43b19ac26c18478bac1c5f18153f0343ea2a63e269828da043
 
IA-32:
kexec-tools-1.102pre-154.el5.i386.rpm
File outdated by:  RHBA-2013:1321
    MD5: 165ad57d399d6b3dc2ca7b6672d8fd02
SHA-256: f66caafc2862a1b33deee09a74655a7e7e5e0aac26a0b036c0dc714c056ecf1c
kexec-tools-debuginfo-1.102pre-154.el5.i386.rpm
File outdated by:  RHBA-2013:1321
    MD5: a2f8b134708a90932c9c79ca9e43c222
SHA-256: fd0e322cf5b41bf10a7c07690a344046add7e24e00b5e992000a3e7e491dd4fd
 
x86_64:
kexec-tools-1.102pre-154.el5.x86_64.rpm
File outdated by:  RHBA-2013:1321
    MD5: b63403f2cdccb73beeba46f2ccdebb2f
SHA-256: be39a444d43e292309d76ba3149ac1afff7d915e3707c90d796de977977a723f
kexec-tools-debuginfo-1.102pre-154.el5.x86_64.rpm
File outdated by:  RHBA-2013:1321
    MD5: 1ffbae554e81ad010b4cb3bb897e03eb
SHA-256: b5802a23a6c01391609259c4dd4473e0b8294637984568c5493683780206ab42
 
(The unlinked packages above are only available from the Red Hat Network)

Bugs fixed (see bugzilla for more information)

662530 - ln: creating symbolic link `/tmp/initrd.ta4308/lib/libc.so.6' to `/lib/power6/libc.so.6': File exists
678308 - kexec kernel crashes due to use of reserved memory range
709622 - Non-portable "while" loop form used
716439 - CVE-2011-3588 CVE-2011-3589 CVE-2011-3590 kexec-tools: Multiple security flaws by management of kdump core files and ramdisk images
748319 - fsck: WARNING: couldn't open /etc/fstab: No such file or directory


References



These packages are GPG signed by Red Hat for security. Our key and details on how to verify the signature are available from:
https://www.redhat.com/security/team/key/#package

The Red Hat security contact is secalert@redhat.com. More contact details at http://www.redhat.com/security/team/contact/