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=====================================================================
                   Red Hat Security Advisory

Synopsis:          Moderate: ecryptfs-utils security update
Advisory ID:       RHSA-2011:1241-01
Product:           Red Hat Enterprise Linux
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2011-1241.html
Issue date:        2011-08-31
CVE Names:         CVE-2011-1831 CVE-2011-1832 CVE-2011-1834 
                   CVE-2011-1835 CVE-2011-1837 CVE-2011-3145 
=====================================================================

1. Summary:

Updated ecryptfs-utils packages that fix several security issues are now
available for Red Hat Enterprise Linux 5 and 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.

2. Relevant releases/architectures:

RHEL Desktop Workstation (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux (v. 5 server) - i386, ia64, ppc, s390x, x86_64
Red Hat Enterprise Linux Desktop (v. 5 client) - i386, x86_64
Red Hat Enterprise Linux Desktop (v. 6) - i386, x86_64
Red Hat Enterprise Linux Desktop Optional (v. 6) - i386, 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) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Server Optional (v. 6) - i386, ppc64, s390x, x86_64
Red Hat Enterprise Linux Workstation (v. 6) - i386, x86_64
Red Hat Enterprise Linux Workstation Optional (v. 6) - i386, x86_64

3. Description:

eCryptfs is a stacked, cryptographic file system. It is transparent to the
underlying file system and provides per-file granularity. eCryptfs is
released as a Technology Preview for Red Hat Enterprise Linux 5 and 6.

The setuid mount.ecryptfs_private utility allows users to mount an eCryptfs
file system. This utility can only be run by users in the "ecryptfs" group.

A race condition flaw was found in the way mount.ecryptfs_private checked
the permissions of a requested mount point when mounting an encrypted file
system. A local attacker could possibly use this flaw to escalate their
privileges by mounting over an arbitrary directory. (CVE-2011-1831)

A race condition flaw in umount.ecryptfs_private could allow a local
attacker to unmount an arbitrary file system. (CVE-2011-1832)

It was found that mount.ecryptfs_private did not handle certain errors
correctly when updating the mtab (mounted file systems table) file,
allowing a local attacker to corrupt the mtab file and possibly unmount an
arbitrary file system. (CVE-2011-1834)

An insecure temporary file use flaw was found in the ecryptfs-setup-private
script. A local attacker could use this script to insert their own key that
will subsequently be used by a new user, possibly giving the attacker
access to the user's encrypted data if existing file permissions allow
access. (CVE-2011-1835)

A race condition flaw in mount.ecryptfs_private could allow a local
attacker to overwrite arbitrary files. (CVE-2011-1837)

A race condition flaw in the way temporary files were accessed in
mount.ecryptfs_private could allow a malicious, local user to make
arbitrary modifications to the mtab file. (CVE-2011-3145)

A race condition flaw was found in the way mount.ecryptfs_private checked
the permissions of the directory to mount. A local attacker could use this
flaw to mount (and then access) a directory they would otherwise not have
access to. Note: The fix for this issue is incomplete until a kernel-space
change is made. Future Red Hat Enterprise Linux 5 and 6 kernel updates
will correct this issue. (CVE-2011-1833)

Red Hat would like to thank the Ubuntu Security Team for reporting these
issues. The Ubuntu Security Team acknowledges Vasiliy Kulikov of Openwall
and Dan Rosenberg as the original reporters of CVE-2011-1831,
CVE-2011-1832, and CVE-2011-1833; Dan Rosenberg and Marc Deslauriers as the
original reporters of CVE-2011-1834; Marc Deslauriers as the original
reporter of CVE-2011-1835; and Vasiliy Kulikov of Openwall as the original
reporter of CVE-2011-1837.

Users of ecryptfs-utils are advised to upgrade to these updated packages,
which contain backported patches to correct these issues.

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/):

729465 - CVE-2011-1831 CVE-2011-1832 CVE-2011-1834 CVE-2011-1835 CVE-2011-1837 ecryptfs: multiple flaws to mount/umount arbitrary locations and possibly disclose confidential information
732607 - CVE-2011-3145 ecryptfs-utils: incorrect mtab group ownership

6. Package List:

Red Hat Enterprise Linux Desktop (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/ecryptfs-utils-75-5.el5_7.2.src.rpm

i386:
ecryptfs-utils-75-5.el5_7.2.i386.rpm
ecryptfs-utils-debuginfo-75-5.el5_7.2.i386.rpm
ecryptfs-utils-gui-75-5.el5_7.2.i386.rpm

x86_64:
ecryptfs-utils-75-5.el5_7.2.i386.rpm
ecryptfs-utils-75-5.el5_7.2.x86_64.rpm
ecryptfs-utils-debuginfo-75-5.el5_7.2.i386.rpm
ecryptfs-utils-debuginfo-75-5.el5_7.2.x86_64.rpm
ecryptfs-utils-gui-75-5.el5_7.2.x86_64.rpm

RHEL Desktop Workstation (v. 5 client):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Client/en/os/SRPMS/ecryptfs-utils-75-5.el5_7.2.src.rpm

i386:
ecryptfs-utils-debuginfo-75-5.el5_7.2.i386.rpm
ecryptfs-utils-devel-75-5.el5_7.2.i386.rpm

x86_64:
ecryptfs-utils-debuginfo-75-5.el5_7.2.i386.rpm
ecryptfs-utils-debuginfo-75-5.el5_7.2.x86_64.rpm
ecryptfs-utils-devel-75-5.el5_7.2.i386.rpm
ecryptfs-utils-devel-75-5.el5_7.2.x86_64.rpm

Red Hat Enterprise Linux (v. 5 server):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/5Server/en/os/SRPMS/ecryptfs-utils-75-5.el5_7.2.src.rpm

i386:
ecryptfs-utils-75-5.el5_7.2.i386.rpm
ecryptfs-utils-debuginfo-75-5.el5_7.2.i386.rpm
ecryptfs-utils-devel-75-5.el5_7.2.i386.rpm
ecryptfs-utils-gui-75-5.el5_7.2.i386.rpm

ia64:
ecryptfs-utils-75-5.el5_7.2.ia64.rpm
ecryptfs-utils-debuginfo-75-5.el5_7.2.ia64.rpm
ecryptfs-utils-devel-75-5.el5_7.2.ia64.rpm
ecryptfs-utils-gui-75-5.el5_7.2.ia64.rpm

ppc:
ecryptfs-utils-75-5.el5_7.2.ppc.rpm
ecryptfs-utils-75-5.el5_7.2.ppc64.rpm
ecryptfs-utils-debuginfo-75-5.el5_7.2.ppc.rpm
ecryptfs-utils-debuginfo-75-5.el5_7.2.ppc64.rpm
ecryptfs-utils-devel-75-5.el5_7.2.ppc.rpm
ecryptfs-utils-devel-75-5.el5_7.2.ppc64.rpm
ecryptfs-utils-gui-75-5.el5_7.2.ppc.rpm

s390x:
ecryptfs-utils-75-5.el5_7.2.s390.rpm
ecryptfs-utils-75-5.el5_7.2.s390x.rpm
ecryptfs-utils-debuginfo-75-5.el5_7.2.s390.rpm
ecryptfs-utils-debuginfo-75-5.el5_7.2.s390x.rpm
ecryptfs-utils-devel-75-5.el5_7.2.s390.rpm
ecryptfs-utils-devel-75-5.el5_7.2.s390x.rpm
ecryptfs-utils-gui-75-5.el5_7.2.s390x.rpm

x86_64:
ecryptfs-utils-75-5.el5_7.2.i386.rpm
ecryptfs-utils-75-5.el5_7.2.x86_64.rpm
ecryptfs-utils-debuginfo-75-5.el5_7.2.i386.rpm
ecryptfs-utils-debuginfo-75-5.el5_7.2.x86_64.rpm
ecryptfs-utils-devel-75-5.el5_7.2.i386.rpm
ecryptfs-utils-devel-75-5.el5_7.2.x86_64.rpm
ecryptfs-utils-gui-75-5.el5_7.2.x86_64.rpm

Red Hat Enterprise Linux Desktop (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/ecryptfs-utils-82-6.el6_1.3.src.rpm

i386:
ecryptfs-utils-82-6.el6_1.3.i686.rpm
ecryptfs-utils-debuginfo-82-6.el6_1.3.i686.rpm

x86_64:
ecryptfs-utils-82-6.el6_1.3.i686.rpm
ecryptfs-utils-82-6.el6_1.3.x86_64.rpm
ecryptfs-utils-debuginfo-82-6.el6_1.3.i686.rpm
ecryptfs-utils-debuginfo-82-6.el6_1.3.x86_64.rpm

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

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Client/en/os/SRPMS/ecryptfs-utils-82-6.el6_1.3.src.rpm

i386:
ecryptfs-utils-debuginfo-82-6.el6_1.3.i686.rpm
ecryptfs-utils-devel-82-6.el6_1.3.i686.rpm
ecryptfs-utils-python-82-6.el6_1.3.i686.rpm

x86_64:
ecryptfs-utils-debuginfo-82-6.el6_1.3.i686.rpm
ecryptfs-utils-debuginfo-82-6.el6_1.3.x86_64.rpm
ecryptfs-utils-devel-82-6.el6_1.3.i686.rpm
ecryptfs-utils-devel-82-6.el6_1.3.x86_64.rpm
ecryptfs-utils-python-82-6.el6_1.3.x86_64.rpm

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

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/ecryptfs-utils-82-6.el6_1.3.src.rpm

x86_64:
ecryptfs-utils-82-6.el6_1.3.i686.rpm
ecryptfs-utils-82-6.el6_1.3.x86_64.rpm
ecryptfs-utils-debuginfo-82-6.el6_1.3.i686.rpm
ecryptfs-utils-debuginfo-82-6.el6_1.3.x86_64.rpm

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

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6ComputeNode/en/os/SRPMS/ecryptfs-utils-82-6.el6_1.3.src.rpm

x86_64:
ecryptfs-utils-debuginfo-82-6.el6_1.3.i686.rpm
ecryptfs-utils-debuginfo-82-6.el6_1.3.x86_64.rpm
ecryptfs-utils-devel-82-6.el6_1.3.i686.rpm
ecryptfs-utils-devel-82-6.el6_1.3.x86_64.rpm
ecryptfs-utils-python-82-6.el6_1.3.x86_64.rpm

Red Hat Enterprise Linux Server (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/ecryptfs-utils-82-6.el6_1.3.src.rpm

i386:
ecryptfs-utils-82-6.el6_1.3.i686.rpm
ecryptfs-utils-debuginfo-82-6.el6_1.3.i686.rpm

ppc64:
ecryptfs-utils-82-6.el6_1.3.ppc.rpm
ecryptfs-utils-82-6.el6_1.3.ppc64.rpm
ecryptfs-utils-debuginfo-82-6.el6_1.3.ppc.rpm
ecryptfs-utils-debuginfo-82-6.el6_1.3.ppc64.rpm

s390x:
ecryptfs-utils-82-6.el6_1.3.s390.rpm
ecryptfs-utils-82-6.el6_1.3.s390x.rpm
ecryptfs-utils-debuginfo-82-6.el6_1.3.s390.rpm
ecryptfs-utils-debuginfo-82-6.el6_1.3.s390x.rpm

x86_64:
ecryptfs-utils-82-6.el6_1.3.i686.rpm
ecryptfs-utils-82-6.el6_1.3.x86_64.rpm
ecryptfs-utils-debuginfo-82-6.el6_1.3.i686.rpm
ecryptfs-utils-debuginfo-82-6.el6_1.3.x86_64.rpm

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

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/os/SRPMS/ecryptfs-utils-82-6.el6_1.3.src.rpm

i386:
ecryptfs-utils-debuginfo-82-6.el6_1.3.i686.rpm
ecryptfs-utils-devel-82-6.el6_1.3.i686.rpm
ecryptfs-utils-python-82-6.el6_1.3.i686.rpm

ppc64:
ecryptfs-utils-debuginfo-82-6.el6_1.3.ppc.rpm
ecryptfs-utils-debuginfo-82-6.el6_1.3.ppc64.rpm
ecryptfs-utils-devel-82-6.el6_1.3.ppc.rpm
ecryptfs-utils-devel-82-6.el6_1.3.ppc64.rpm
ecryptfs-utils-python-82-6.el6_1.3.ppc64.rpm

s390x:
ecryptfs-utils-debuginfo-82-6.el6_1.3.s390.rpm
ecryptfs-utils-debuginfo-82-6.el6_1.3.s390x.rpm
ecryptfs-utils-devel-82-6.el6_1.3.s390.rpm
ecryptfs-utils-devel-82-6.el6_1.3.s390x.rpm
ecryptfs-utils-python-82-6.el6_1.3.s390x.rpm

x86_64:
ecryptfs-utils-debuginfo-82-6.el6_1.3.i686.rpm
ecryptfs-utils-debuginfo-82-6.el6_1.3.x86_64.rpm
ecryptfs-utils-devel-82-6.el6_1.3.i686.rpm
ecryptfs-utils-devel-82-6.el6_1.3.x86_64.rpm
ecryptfs-utils-python-82-6.el6_1.3.x86_64.rpm

Red Hat Enterprise Linux Workstation (v. 6):

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/ecryptfs-utils-82-6.el6_1.3.src.rpm

i386:
ecryptfs-utils-82-6.el6_1.3.i686.rpm
ecryptfs-utils-debuginfo-82-6.el6_1.3.i686.rpm

x86_64:
ecryptfs-utils-82-6.el6_1.3.i686.rpm
ecryptfs-utils-82-6.el6_1.3.x86_64.rpm
ecryptfs-utils-debuginfo-82-6.el6_1.3.i686.rpm
ecryptfs-utils-debuginfo-82-6.el6_1.3.x86_64.rpm

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

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Workstation/en/os/SRPMS/ecryptfs-utils-82-6.el6_1.3.src.rpm

i386:
ecryptfs-utils-debuginfo-82-6.el6_1.3.i686.rpm
ecryptfs-utils-devel-82-6.el6_1.3.i686.rpm
ecryptfs-utils-python-82-6.el6_1.3.i686.rpm

x86_64:
ecryptfs-utils-debuginfo-82-6.el6_1.3.i686.rpm
ecryptfs-utils-debuginfo-82-6.el6_1.3.x86_64.rpm
ecryptfs-utils-devel-82-6.el6_1.3.i686.rpm
ecryptfs-utils-devel-82-6.el6_1.3.x86_64.rpm
ecryptfs-utils-python-82-6.el6_1.3.x86_64.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-2011-1831.html
https://www.redhat.com/security/data/cve/CVE-2011-1832.html
https://www.redhat.com/security/data/cve/CVE-2011-1834.html
https://www.redhat.com/security/data/cve/CVE-2011-1835.html
https://www.redhat.com/security/data/cve/CVE-2011-1837.html
https://www.redhat.com/security/data/cve/CVE-2011-3145.html
https://access.redhat.com/security/updates/classification/#moderate
https://access.redhat.com/support/offerings/techpreview/

8. Contact:

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

Copyright 2011 Red Hat, Inc.
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