U radu jezgre operacijskog sustava Red Hat Enterprise Linux 6 uočeno je više sigurnosnih propusta. Napadači ih mogu iskoristiti za izvođenje DoS napada, stjecanje povećanih ovlasti te otkrivanje osjetljivih informacija.

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

Synopsis:          Important: kernel-rt security and bug fix update
Advisory ID:       RHSA-2011:1253-01
Product:           Red Hat Enterprise MRG for RHEL-6
Advisory URL:      https://rhn.redhat.com/errata/RHSA-2011-1253.html
Issue date:        2011-09-12
CVE Names:         CVE-2010-4243 CVE-2010-4526 CVE-2011-1020 
                   CVE-2011-1021 CVE-2011-1090 CVE-2011-1160 
                   CVE-2011-1478 CVE-2011-1479 CVE-2011-1494 
                   CVE-2011-1495 CVE-2011-1576 CVE-2011-1577 
                   CVE-2011-1585 CVE-2011-1593 CVE-2011-1598 
                   CVE-2011-1745 CVE-2011-1746 CVE-2011-1748 
                   CVE-2011-1767 CVE-2011-1768 CVE-2011-1770 
                   CVE-2011-1776 CVE-2011-2022 CVE-2011-2183 
                   CVE-2011-2213 CVE-2011-2484 CVE-2011-2491 
                   CVE-2011-2492 CVE-2011-2495 CVE-2011-2496 
                   CVE-2011-2497 CVE-2011-2517 CVE-2011-2695 
=====================================================================

1. Summary:

Updated kernel-rt packages that fix multiple security issues and various
bugs are now available for Red Hat Enterprise MRG 2.0.

The Red Hat Security Response Team has rated this update as having
important 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:

MRG Realtime for RHEL 6 Server v.2 - noarch, x86_64

3. Description:

Security fixes:

* A flaw in the SCTP and DCCP implementations could allow a remote attacker
to cause a denial of service. (CVE-2010-4526, CVE-2011-1770, Important)

* Flaws in the Management Module Support for Message Passing Technology
(MPT) based controllers could allow a local, unprivileged user to cause a
denial of service, an information leak, or escalate their privileges.
(CVE-2011-1494, CVE-2011-1495, Important)

* Flaws in the AGPGART driver, and a flaw in agp_allocate_memory(), could
allow a local user to cause a denial of service or escalate their
privileges. (CVE-2011-1745, CVE-2011-2022, CVE-2011-1746, Important)

* A flaw in the client-side NLM implementation could allow a local,
unprivileged user to cause a denial of service. (CVE-2011-2491, Important)

* A flaw in the Bluetooth implementation could allow a remote attacker to
cause a denial of service or escalate their privileges. (CVE-2011-2497,
Important)

* Flaws in the netlink-based wireless configuration interface could allow a
local user, who has the CAP_NET_ADMIN capability, to cause a denial of
service or escalate their privileges on systems that have an active
wireless interface. (CVE-2011-2517, Important)

* The maximum file offset handling for ext4 file systems could allow a
local, unprivileged user to cause a denial of service. (CVE-2011-2695,
Important)

* A local, unprivileged user could allocate large amounts of memory not
visible to the OOM killer, causing a denial of service. (CVE-2010-4243,
Moderate)

* The proc file system could allow a local, unprivileged user to obtain
sensitive information or possibly cause integrity issues. (CVE-2011-1020,
Moderate)

* A local, privileged user could possibly write arbitrary kernel memory via
/sys/kernel/debug/acpi/custom_method. (CVE-2011-1021, Moderate)

* Inconsistency in the methods for allocating and freeing NFSv4 ACL data;
CVE-2010-4250 fix caused a regression; a flaw in next_pidmap() and
inet_diag_bc_audit(); flaws in the CAN implementation; a race condition in
the memory merging support; a flaw in the taskstats subsystem; and the way
mapping expansions were handled could allow a local, unprivileged user to
cause a denial of service. (CVE-2011-1090, CVE-2011-1479, CVE-2011-1593,
CVE-2011-2213, CVE-2011-1598, CVE-2011-1748, CVE-2011-2183, CVE-2011-2484,
CVE-2011-2496, Moderate)

* A flaw in GRO could result in a denial of service when a malformed VLAN
frame is received. (CVE-2011-1478, Moderate)

* napi_reuse_skb() could be called on VLAN packets allowing an attacker on
the local network to possibly trigger a denial of service. (CVE-2011-1576,
Moderate)

* A denial of service could occur if packets were received while the ipip
or ip_gre module was being loaded. (CVE-2011-1767, CVE-2011-1768, Moderate)

* Information leaks. (CVE-2011-1160, CVE-2011-2492, CVE-2011-2495, Low)

* Flaws in the EFI GUID Partition Table implementation could allow a local
attacker to cause a denial of service. (CVE-2011-1577, CVE-2011-1776, Low)

* While a user has a CIFS share mounted that required successful
authentication, a local, unprivileged user could mount that share without
knowing the correct password if mount.cifs was setuid root. (CVE-2011-1585,
Low)

Red Hat would like to thank Dan Rosenberg for reporting CVE-2011-1770,
CVE-2011-1494, CVE-2011-1495, CVE-2011-2497, and CVE-2011-2213; Vasiliy
Kulikov of Openwall for reporting CVE-2011-1745, CVE-2011-2022,
CVE-2011-1746, CVE-2011-2484, and CVE-2011-2495; Vasily Averin for
reporting CVE-2011-2491; Brad Spengler for reporting CVE-2010-4243; Kees
Cook for reporting CVE-2011-1020; Robert Swiecki for reporting
CVE-2011-1593 and CVE-2011-2496; Oliver Hartkopp for reporting
CVE-2011-1748; Andrea Righi for reporting CVE-2011-2183; Ryan Sweat for
reporting CVE-2011-1478 and CVE-2011-1576; Peter Huewe for reporting
CVE-2011-1160; Marek Kroemeke and Filip Palian for reporting CVE-2011-2492;
and Timo Warns for reporting CVE-2011-1577 and CVE-2011-1776.

4. Solution:

This update also fixes various bugs. Documentation for these bug fixes
will be available shortly from the Technical Notes document linked to
in the References section.

Users should upgrade to these updated packages, which correct these
issues, and fix the bugs noted in the Technical Notes. The system
must be rebooted for this update to take effect.

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

To install kernel packages manually, use "rpm -ivh [package]". Do not
use "rpm -Uvh" as that will remove the running kernel binaries from
your system. You may use "rpm -e" to remove old kernels after
determining that the new kernel functions properly on your system.

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

625688 - CVE-2010-4243 kernel: mm: mem allocated invisible to oom_kill() when
not attached to any threads
664914 - CVE-2010-4526 kernel: sctp: a race between ICMP protocol unreachable
and connect()
680358 - CVE-2011-1020 kernel: no access restrictions of /proc/pid/* after
setuid program exec
680841 - CVE-2011-1021 kernel: /sys/kernel/debug/acpi/custom_method can bypass
module restrictions
681987 - crash module required for RT kernel
682641 - CVE-2011-1090 kernel: nfs4: Ensure that ACL pages sent over NFS were
not allocated from the slab
684671 - CVE-2011-1160 kernel: tpm infoleaks
691270 - CVE-2011-1478 kernel: gro: reset dev and skb_iff on skb reuse
691793 - CVE-2011-1479 kernel: DoS (crash) due slab corruption in inotify_init1
(incomplete fix for CVE-2010-4250)
694021 - CVE-2011-1494 CVE-2011-1495 kernel: drivers/scsi/mpt2sas: prevent heap
overflows
695173 - CVE-2011-1576 kernel: net: Fix memory leak/corruption on VLAN
GRO_DROP
695976 - CVE-2011-1577 kernel: corrupted GUID partition tables can cause kernel
oops
697394 - CVE-2011-1585 kernel: cifs session reuse
697822 - CVE-2011-1593 kernel: proc: signedness issue in next_pidmap()
698057 - CVE-2011-1598 CVE-2011-1748 kernel: missing check in can/bcm and
can/raw socket releases
698996 - CVE-2011-1745 CVE-2011-2022 kernel: agp: insufficient pg_start
parameter checking in AGPIOC_BIND and AGPIOC_UNBIND ioctls
698998 - CVE-2011-1746 kernel: agp: insufficient page_count parameter checking
in agp_allocate_memory()
702303 - CVE-2011-1767 CVE-2011-1768 kernel: netns vs proto registration
ordering
703011 - CVE-2011-1770 kernel: dccp: handle invalid feature options length
703019 - CVE-2011-2492 kernel: bluetooth: l2cap and rfcomm: fix 1 byte infoleak
to userspace
703026 - CVE-2011-1776 kernel: validate size of EFI GUID partition entries
709393 - CVE-2011-2491 kernel: rpc task leak after flock()ing  NFS share
710158 - CONFIG_NF_CT_ACCT is deprecated in kernel-rt-2.6.33.9-rt31.66.el6rt
710338 - CVE-2011-2183 kernel: ksm: race between ksmd and exiting task
714536 - CVE-2011-2213 kernel: inet_diag: insufficient validation
715436 - CVE-2011-2484 kernel: taskstats: duplicate entries in listener mode
can lead to DoS
716538 - CVE-2011-2496 kernel: mm: avoid wrapping vm_pgoff in mremap() and
stack expansions
716805 - CVE-2011-2497 kernel: bluetooth: buffer overflow in l2cap config
request
716825 - CVE-2011-2495 kernel: /proc/PID/io infoleak
718152 - CVE-2011-2517 kernel: nl80211: missing check for valid SSID size in
scan operations
722557 - CVE-2011-2695 kernel: ext4: kernel panic when writing data to the last
block of sparse file
728310 - MRG/RT 2.6.33.9-rt31.73 is missing cxgb3/t3fw-7.10.0.bin firmware
files
728551 - add /sys/kernel/realtime entry

6. Package List:

MRG Realtime for RHEL 6 Server v.2:

Source:
ftp://ftp.redhat.com/pub/redhat/linux/enterprise/6Server/en/RHEMRG-RHEL6/SRPMS/kernel-rt-2.6.33.9-rt31.75.el6rt.src.rpm

noarch:
kernel-rt-doc-2.6.33.9-rt31.75.el6rt.noarch.rpm
kernel-rt-firmware-2.6.33.9-rt31.75.el6rt.noarch.rpm

x86_64:
kernel-rt-2.6.33.9-rt31.75.el6rt.x86_64.rpm
kernel-rt-debug-2.6.33.9-rt31.75.el6rt.x86_64.rpm
kernel-rt-debug-debuginfo-2.6.33.9-rt31.75.el6rt.x86_64.rpm
kernel-rt-debug-devel-2.6.33.9-rt31.75.el6rt.x86_64.rpm
kernel-rt-debuginfo-2.6.33.9-rt31.75.el6rt.x86_64.rpm
kernel-rt-debuginfo-common-x86_64-2.6.33.9-rt31.75.el6rt.x86_64.rpm
kernel-rt-devel-2.6.33.9-rt31.75.el6rt.x86_64.rpm
kernel-rt-trace-2.6.33.9-rt31.75.el6rt.x86_64.rpm
kernel-rt-trace-debuginfo-2.6.33.9-rt31.75.el6rt.x86_64.rpm
kernel-rt-trace-devel-2.6.33.9-rt31.75.el6rt.x86_64.rpm
kernel-rt-vanilla-2.6.33.9-rt31.75.el6rt.x86_64.rpm
kernel-rt-vanilla-debuginfo-2.6.33.9-rt31.75.el6rt.x86_64.rpm
kernel-rt-vanilla-devel-2.6.33.9-rt31.75.el6rt.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-2010-4243.html
https://www.redhat.com/security/data/cve/CVE-2010-4526.html
https://www.redhat.com/security/data/cve/CVE-2011-1020.html
https://www.redhat.com/security/data/cve/CVE-2011-1021.html
https://www.redhat.com/security/data/cve/CVE-2011-1090.html
https://www.redhat.com/security/data/cve/CVE-2011-1160.html
https://www.redhat.com/security/data/cve/CVE-2011-1478.html
https://www.redhat.com/security/data/cve/CVE-2011-1479.html
https://www.redhat.com/security/data/cve/CVE-2011-1494.html
https://www.redhat.com/security/data/cve/CVE-2011-1495.html
https://www.redhat.com/security/data/cve/CVE-2011-1576.html
https://www.redhat.com/security/data/cve/CVE-2011-1577.html
https://www.redhat.com/security/data/cve/CVE-2011-1585.html
https://www.redhat.com/security/data/cve/CVE-2011-1593.html
https://www.redhat.com/security/data/cve/CVE-2011-1598.html
https://www.redhat.com/security/data/cve/CVE-2011-1745.html
https://www.redhat.com/security/data/cve/CVE-2011-1746.html
https://www.redhat.com/security/data/cve/CVE-2011-1748.html
https://www.redhat.com/security/data/cve/CVE-2011-1767.html
https://www.redhat.com/security/data/cve/CVE-2011-1768.html
https://www.redhat.com/security/data/cve/CVE-2011-1770.html
https://www.redhat.com/security/data/cve/CVE-2011-1776.html
https://www.redhat.com/security/data/cve/CVE-2011-2022.html
https://www.redhat.com/security/data/cve/CVE-2011-2183.html
https://www.redhat.com/security/data/cve/CVE-2011-2213.html
https://www.redhat.com/security/data/cve/CVE-2011-2484.html
https://www.redhat.com/security/data/cve/CVE-2011-2491.html
https://www.redhat.com/security/data/cve/CVE-2011-2492.html
https://www.redhat.com/security/data/cve/CVE-2011-2495.html
https://www.redhat.com/security/data/cve/CVE-2011-2496.html
https://www.redhat.com/security/data/cve/CVE-2011-2497.html
https://www.redhat.com/security/data/cve/CVE-2011-2517.html
https://www.redhat.com/security/data/cve/CVE-2011-2695.html
https://access.redhat.com/security/updates/classification/#important
https://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_MRG/2.0/html/Technical_Notes/index.html

8. Contact:

The Red Hat security contact is <Ova e-mail adresa je zaštićena od spambota. Potrebno je omogućiti JavaScript da je vidite.>.  More contact
details at https://access.redhat.com/security/team/contact/

Copyright 2011 Red Hat, Inc.
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