Issued:
2012-01-10
Updated:
2012-01-10

RHSA-2012:0010 - Security Advisory

Synopsis

Important: kernel-rt security and bug fix update

Type/Severity

Security Advisory: Important

Topic

Updated kernel-rt packages that fix several security issues and two 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

The kernel-rt packages contain the Linux kernel, the core of any Linux
operating system.

This update fixes the following security issues:

  • A malicious CIFS (Common Internet File System) server could send a
    specially-crafted response to a directory read request that would result in
    a denial of service or privilege escalation on a system that has a CIFS
    share mounted. (CVE-2011-3191, Important)
  • The way fragmented IPv6 UDP datagrams over the bridge with UDP
    Fragmentation Offload (UFO) functionality on were handled could allow a
    remote attacker to cause a denial of service. (CVE-2011-4326, Important)
  • GRO (Generic Receive Offload) fields could be left in an inconsistent
    state. An attacker on the local network could use this flaw to cause a
    denial of service. GRO is enabled by default in all network drivers that
    support it. (CVE-2011-2723, Moderate)
  • IPv4 and IPv6 protocol sequence number and fragment ID generation could
    allow a man-in-the-middle attacker to inject packets and possibly hijack
    connections. Protocol sequence numbers and fragment IDs are now more
    random. (CVE-2011-3188, Moderate)
  • A flaw in the FUSE (Filesystem in Userspace) implementation could allow
    a local user in the fuse group who has access to mount a FUSE file system
    to cause a denial of service. (CVE-2011-3353, Moderate)
  • A flaw in the b43 driver. If a system had an active wireless interface
    that uses the b43 driver, an attacker able to send a specially-crafted
    frame to that interface could cause a denial of service. (CVE-2011-3359,
    Moderate)
  • A flaw in the way CIFS shares with DFS referrals at their root were
    handled could allow an attacker on the local network, who is able to deploy
    a malicious CIFS server, to create a CIFS network share that, when mounted,
    would cause the client system to crash. (CVE-2011-3363, Moderate)
  • A flaw in the m_stop() implementation could allow a local, unprivileged
    user to trigger a denial of service. (CVE-2011-3637, Moderate)
  • Flaws in ghash_update() and ghash_final() could allow a local,
    unprivileged user to cause a denial of service. (CVE-2011-4081, Moderate)
  • A flaw in the key management facility could allow a local, unprivileged
    user to cause a denial of service via the keyctl utility. (CVE-2011-4110,
    Moderate)
  • A flaw in the Journaling Block Device (JBD) could allow a local attacker
    to crash the system by mounting a specially-crafted ext3 or ext4 disk.
    (CVE-2011-4132, Moderate)
  • A flaw in the way memory containing security-related data was handled in
    tpm_read() could allow a local, unprivileged user to read the results of a
    previously run TPM command. (CVE-2011-1162, Low)
  • I/O statistics from the taskstats subsystem could be read without any
    restrictions, which could allow a local, unprivileged user to gather
    confidential information, such as the length of a password used in a
    process. (CVE-2011-2494, Low)
  • Flaws in tpacket_rcv() and packet_recvmsg() could allow a local,
    unprivileged user to leak information to user-space. (CVE-2011-2898, Low)

Red Hat would like to thank Darren Lavender for reporting CVE-2011-3191;
Brent Meshier for reporting CVE-2011-2723; Dan Kaminsky for reporting
CVE-2011-3188; Yogesh Sharma for reporting CVE-2011-3363; Nick Bowler for
reporting CVE-2011-4081; Peter Huewe for reporting CVE-2011-1162; and
Vasiliy Kulikov of Openwall for reporting CVE-2011-2494.

This update also fixes the following bugs:

  • Previously, a mismatch in the build-id of the kernel-rt and the one in
    the related debuginfo package caused failures in SystemTap and perf.
    (BZ#768413)
  • IBM x3650m3 systems were not able to boot the MRG Realtime kernel because
    they require a pmcraid driver that was not available. The pmcraid driver is
    included in this update. (BZ#753992)

Users should upgrade to these updated packages, which correct these issues.
The system must be rebooted for this update to take effect.

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

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 - 716842 - CVE-2011-2494 kernel: taskstats io infoleak
  • BZ - 726552 - CVE-2011-2723 kernel: gro: only reset frag0 when skb can be pulled
  • BZ - 728023 - CVE-2011-2898 kernel: af_packet: infoleak
  • BZ - 732629 - CVE-2011-1162 kernel: tpm: infoleak
  • BZ - 732658 - CVE-2011-3188 kernel: net: improve sequence number generation
  • BZ - 732869 - CVE-2011-3191 kernel: cifs: signedness issue in CIFSFindNext()
  • BZ - 736761 - CVE-2011-3353 kernel: fuse: check size of FUSE_NOTIFY_INVAL_ENTRY message
  • BZ - 738202 - CVE-2011-3359 kernel: b43: allocate receive buffers big enough for max frame len + offset
  • BZ - 738291 - CVE-2011-3363 kernel: cifs: always do is_path_accessible check in cifs_mount
  • BZ - 747848 - CVE-2011-3637 kernel: proc: fix oops on invalid /proc/<pid>/maps access
  • BZ - 749475 - CVE-2011-4081 kernel: crypto: ghash: null pointer deref if no key is set
  • BZ - 751297 - CVE-2011-4110 kernel: keys: NULL pointer deref in the user-defined key type
  • BZ - 753341 - CVE-2011-4132 kernel: jbd/jbd2: invalid value of first log block leads to oops
  • BZ - 755584 - CVE-2011-4326 kernel: wrong headroom check in udp6_ufo_fragment()

CVEs

References

MRG Realtime 2

SRPM
kernel-rt-2.6.33.9-rt31.79.el6rt.src.rpm SHA-256: 627e73fc9a9c750cfc6f17450b67799eb9e0789d0cc0e00952470ce957fd4b8e
x86_64
kernel-rt-2.6.33.9-rt31.79.el6rt.x86_64.rpm SHA-256: f4e0e27e887a733ee59d13ea96be84d15805945ec6c8ec1445b0ca66f831aca9
kernel-rt-debug-2.6.33.9-rt31.79.el6rt.x86_64.rpm SHA-256: d7cdbbd195e92512342bbba6ab0674ad638139a615d9ec6474f2507b1f46a8f5
kernel-rt-debug-debuginfo-2.6.33.9-rt31.79.el6rt.x86_64.rpm SHA-256: ea4826de1b864d83c62f7f02d669b2fa428e9172a43ef90b2327216ec11b8ec7
kernel-rt-debug-devel-2.6.33.9-rt31.79.el6rt.x86_64.rpm SHA-256: aee150bd75a40859a7835597cb08740b6801317b1a34ba54d44cdb6ac946f690
kernel-rt-debuginfo-2.6.33.9-rt31.79.el6rt.x86_64.rpm SHA-256: 3bedc9708ebb246b97ba96811d5f47d4e58eea8a6e224c17a005ba50872c303d
kernel-rt-debuginfo-common-x86_64-2.6.33.9-rt31.79.el6rt.x86_64.rpm SHA-256: 89a342c32f8c7de22348bdbebe6c950fe280dcd07e61f490190ab7198bf5bdd6
kernel-rt-devel-2.6.33.9-rt31.79.el6rt.x86_64.rpm SHA-256: 440174bc8b1db0418a7590e80a2360de7b48ceac61540cf74c76566acc4bb1e5
kernel-rt-doc-2.6.33.9-rt31.79.el6rt.noarch.rpm SHA-256: a9a957554db4300235eae568557034f6596dcd205306000ab58e3d48650159a6
kernel-rt-firmware-2.6.33.9-rt31.79.el6rt.noarch.rpm SHA-256: f870c7bf2dfb882815f3ed504b684a9b224d68a4159d9956c97a20f699dd3574
kernel-rt-trace-2.6.33.9-rt31.79.el6rt.x86_64.rpm SHA-256: 09701aaeaafc5622366cfc2f861ad14b59813c2a0aeb44ceca91b2628b8cf9f0
kernel-rt-trace-debuginfo-2.6.33.9-rt31.79.el6rt.x86_64.rpm SHA-256: 3e91708c438dd6710476dbecb60e5e7e4c1ce2015c18def1b151f434471056a3
kernel-rt-trace-devel-2.6.33.9-rt31.79.el6rt.x86_64.rpm SHA-256: 87ebcfe1107a6a2841d313a7801b06c504ac3789f092af015dfaafd5a70ea194
kernel-rt-vanilla-2.6.33.9-rt31.79.el6rt.x86_64.rpm SHA-256: b50981f8c3a2cdfd9623cf419932e2133fa1e07133fd6c995b177de554256e84
kernel-rt-vanilla-debuginfo-2.6.33.9-rt31.79.el6rt.x86_64.rpm SHA-256: 265fc09a3ea79a6576d018dadc773613816936bab38225a3979eee484dd9a445
kernel-rt-vanilla-devel-2.6.33.9-rt31.79.el6rt.x86_64.rpm SHA-256: 02d1867c573dfd52b0c73bdb7f4aba6156b772b68cce8d67e77ca00b37661ebd

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