[RedHat] Schwachstelle in libguestfs

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Liebe Kolleginnen und Kollegen,

soeben erreichte uns nachfolgendes RedHat Security Advisory. Wir geben
diese Informationen unveraendert an Sie weiter.

CVE-2010-3851 – Schwachstelle in libguestfs vor Version 1.5.23

Die Bibliothek libguestfs vor Version 1.5.23 enthaelt eine
Schwachstelle, die es einem lokalen Angreifer ermoeglicht, mittels eines
speziell praeparierten Gast-Images beliebige Dateien auf dem Host-System
zu lesen. Die automatische Erkennung des Image-Formats durch qemu wird
dabei so ausgenutzt, dass der Gast-Admin einem Raw-Image nachtraeglich
einen qcow2-Header hinzufuegt und in diesem einen alternativen “backing
store” angibt, beispielsweise eine Datei oder ein Block-Device auf dem
Host-System. Nach einem Neustart wird das Gast-Image dann
faelschlicherweise als “backing store” erkannt und der Angreifer
enthaelt Zugriff auf die Daten des Host-Systems. Die Schwachstelle in
libguestfs besteht darin, dass es bislang nicht moeglich war, das Format
des Images direkt anzugeben. Diese Funktionalitaet ist ab Version 1.5.23
enthalten.

Betroffen sind die folgenden Software Pakete und Plattformen:

Paket libguestfs

Red Hat Enterprise Linux Desktop (v. 6) – x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) – x86_64
Red Hat Enterprise Linux HPC Node (v. 6) – x86_64
Red Hat Enterprise Linux HPC Node Optional (v. 6) – x86_64
Red Hat Enterprise Linux Server (v. 6) – x86_64
Red Hat Enterprise Linux Server Optional (v. 6) – x86_64
Red Hat Enterprise Linux Workstation (v. 6) – x86_64
Red Hat Enterprise Linux Workstation Optional (v. 6) – x86_64

Vom Hersteller werden ueberarbeitete Pakete zur Verfuegung gestellt.

(c) der deutschen Zusammenfassung bei DFN-CERT Services GmbH; die
Verbreitung, auch auszugsweise, ist nur unter Hinweis auf den Urheber,
DFN-CERT Services GmbH, und nur zu nicht kommerziellen Zwecken
gestattet.

Mit freundlichen Gruessen,
Timo Schulz

– —
Timo Schulz, M.Sc. (Incident Response Team)

DFN-CERT Services GmbH, https://www.dfn-cert.de, Phone +49 40 808077-590
Sitz / Register: Hamburg, AG Hamburg, HRB 88805, Ust-IdNr.: DE 232129737
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=====================================================================
Red Hat Security Advisory

Synopsis: Low: libguestfs security, bug fix, and enhancement update
Advisory ID: RHSA-2011:0586-01
Product: Red Hat Enterprise Linux
Advisory URL: https://rhn.redhat.com/errata/RHSA-2011-0586.html
Issue date: 2011-05-19
CVE Names: CVE-2010-3851
=====================================================================

1. Summary:

Updated libguestfs packages that fix one security issue, several bugs, and
add one enhancement are now available for Red Hat Enterprise Linux 6.

The Red Hat Security Response Team has rated this update as having low
security impact. A Common Vulnerability Scoring System (CVSS) base score,
which gives a detailed severity rating, is available from the CVE link in
the References section.

2. Relevant releases/architectures:

3. Description:

libguestfs is a library for accessing and modifying guest disk images.

libguestfs relied on the format auto-detection in QEMU rather than
allowing the guest image file format to be specified. A privileged guest
user could potentially use this flaw to read arbitrary files on the host
that were accessible to a user on that host who was running a program that
utilized the libguestfs library. (CVE-2010-3851)

This erratum upgrades libguestfs to upstream version 1.7.17, which includes
a number of bug fixes and one enhancement. Documentation for these bug
fixes and this enhancement is provided in the Technical Notes document,
linked to in the References section.

All libguestfs users are advised to upgrade to these updated packages,
which correct this issue, and fix the bugs and add the enhancement noted
in the Technical Notes.

4. 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

5. Bugs fixed (http://bugzilla.redhat.com/):

600144 – document that mkmountpoint and umount-all cannot be mixed
612308 – qemu -net / vlan option deprecated. Use -netdev instead.
613593 – Rebase libguestfs in RHEL 6.1
615223 – vfs-type could not read just-created filesystem
617440 – guestfish: fails to tilde expand ‘~’ when the $HOME env is unset
627468 – [RFE]It’s better to emphasize “libguestfs-winsupport” in V2V manpage or error output
627832 – [RFE] guestfish should print outputs in a suitable base (eg. octal for modes)
627833 – get-e2uuid should use blkid instead of “tune2fs -l” to get filesystem UUID
633174 – some guestfish sub commands can not handle special files properly
639601 – “virt-ls” command failed to parse domain name “#”
639602 – “”virt-list-filesystems” fails to parse the command line argument if the domain name is “#”.
643958 – CVE-2010-3851 libguestfs: missing disk format specifier when adding a disk
657472 – checksum: wrong check sum type causes umount to fail
657502 – virt-inspector depends on EPEL package perl-String-ShellQuote but does not require it
666577 – libguestfs: unknown filesystem /dev/fd0
666579 – libguestfs: unknown filesystem /dev/hd{x} (cdrom)
668115 – virt-filesystems command fails on guest with corrupt filesystem label
668611 – guestfish -i is trying to mount all mounts from /etc/fstab and fails with an error when device doesn’t exists
673477 – Add a grep-friendly string to LIBGUESTFS_TRACE output
673721 – Typo in virt-make-fs manual page
676788 – libguestfs trace segfaults when list-filesystems returns error
677616 – appliance doesn’t include augeas device_map lens
691724 – virt-inspector reports unknown filesystem /dev/vda1
695138 – Remove dependency on gfs2-utils

6. Package List:

Red Hat Enterprise Linux Desktop (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/libguestfs-1.7.17-17.el6.src.rpm

x86_64:
guestfish-1.7.17-17.el6.x86_64.rpm
libguestfs-1.7.17-17.el6.x86_64.rpm
libguestfs-debuginfo-1.7.17-17.el6.x86_64.rpm
libguestfs-java-1.7.17-17.el6.x86_64.rpm
libguestfs-mount-1.7.17-17.el6.x86_64.rpm
libguestfs-tools-1.7.17-17.el6.x86_64.rpm
libguestfs-tools-c-1.7.17-17.el6.x86_64.rpm
perl-Sys-Guestfs-1.7.17-17.el6.x86_64.rpm

Red Hat Enterprise Linux Desktop Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/libguestfs-1.7.17-17.el6.src.rpm

x86_64:
libguestfs-debuginfo-1.7.17-17.el6.x86_64.rpm
libguestfs-devel-1.7.17-17.el6.x86_64.rpm
libguestfs-java-devel-1.7.17-17.el6.x86_64.rpm
libguestfs-javadoc-1.7.17-17.el6.x86_64.rpm
ocaml-libguestfs-1.7.17-17.el6.x86_64.rpm
ocaml-libguestfs-devel-1.7.17-17.el6.x86_64.rpm
python-libguestfs-1.7.17-17.el6.x86_64.rpm
ruby-libguestfs-1.7.17-17.el6.x86_64.rpm

Red Hat Enterprise Linux HPC Node (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/libguestfs-1.7.17-17.el6.src.rpm

Red Hat Enterprise Linux HPC Node Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/libguestfs-1.7.17-17.el6.src.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/libguestfs-1.7.17-17.el6.src.rpm

Red Hat Enterprise Linux Server Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/libguestfs-1.7.17-17.el6.src.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/libguestfs-1.7.17-17.el6.src.rpm

Red Hat Enterprise Linux Workstation Optional (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/libguestfs-1.7.17-17.el6.src.rpm

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

7. References:

https://www.redhat.com/security/data/cve/CVE-2010-3851.html
https://access.redhat.com/security/updates/classification/#low
http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_Linux/6/html/6.1_Technical_Notes/index.html#libguestfs

8. Contact:

The Red Hat security contact is . More contact
details at https://access.redhat.com/security/team/contact/

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[RedHat] Schwachstelle in libguestfs - RHSA-2011:0586-01

LMP003 Chemnitzer Linux-Tage 2026

[RedHat] Schwachstelle in libguestfs – RHSA-2011:0586-01

[RedHat] Schwachstelle in libguestfs - RHSA-2011:0586-01