RHSA-2011:1253 - Security Advisory

Topic

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.

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.

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.

Affected Products

• MRG Realtime 2 x86_64

Fixes

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

CVEs

• CVE-2010-4243
• CVE-2010-4526
• CVE-2011-1478
• CVE-2011-1090
• CVE-2011-1494
• CVE-2011-1495
• CVE-2011-1577
• CVE-2011-1748
• CVE-2011-1770
• CVE-2011-1598
• CVE-2011-1767
• CVE-2011-1768
• CVE-2011-1776
• CVE-2011-1746
• CVE-2011-1745
• CVE-2011-2492
• CVE-2011-1576
• CVE-2011-2213
• CVE-2011-1593
• CVE-2011-2022
• CVE-2011-2695
• CVE-2011-2517
• CVE-2011-2497
• CVE-2011-2495
• CVE-2011-2491
• CVE-2011-2183
• CVE-2011-1020
• CVE-2011-1021
• CVE-2011-1160
• CVE-2011-2496
• CVE-2011-2484
• CVE-2011-1585
• CVE-2011-1479

References

• 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