Issued:
2012-12-04
Updated:
2012-12-04

RHSA-2012:1491 - 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 multiple
bugs are now available for Red Hat Enterprise MRG 2.2.

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 flaw was found in the way Netlink messages without SCM_CREDENTIALS
    (used for authentication) data set were handled. When not explicitly set,
    the data was sent but with all values set to 0, including the process ID
    and user ID, causing the Netlink message to appear as if it were sent with
    root privileges. A local, unprivileged user could use this flaw to send
    spoofed Netlink messages to an application, possibly resulting in the
    application performing privileged operations if it relied on
    SCM_CREDENTIALS data for the authentication of Netlink messages.
    (CVE-2012-3520, Important)
  • A race condition was found in the way asynchronous I/O and fallocate()
    interacted when using the ext4 file system. A local, unprivileged user
    could use this flaw to expose random data from an extent whose data blocks
    have not yet been written, and thus contain data from a deleted file.
    (CVE-2012-4508, Important)
  • A use-after-free flaw was found in the Linux kernel's memory management
    subsystem in the way quota handling for huge pages was performed. A local,
    unprivileged user could use this flaw to cause a denial of service or,
    potentially, escalate their privileges. (CVE-2012-2133, Moderate)
  • A use-after-free flaw was found in the madvise() system call
    implementation in the Linux kernel. A local, unprivileged user could use
    this flaw to cause a denial of service or, potentially, escalate their
    privileges. (CVE-2012-3511, Moderate)
  • A divide-by-zero flaw was found in the TCP Illinois congestion control
    algorithm implementation in the Linux kernel. If the TCP Illinois
    congestion control algorithm were in use (the sysctl
    net.ipv4.tcp_congestion_control variable set to "illinois"), a local,
    unprivileged user could trigger this flaw and cause a denial of service.
    (CVE-2012-4565, Moderate)
  • An information leak flaw was found in the uname() system call
    implementation in the Linux kernel. A local, unprivileged user could use
    this flaw to leak kernel stack memory to user-space by setting the UNAME26
    personality and then calling the uname() system call. (CVE-2012-0957, Low)
  • Buffer overflow flaws were found in the udf_load_logicalvol() function in
    the Universal Disk Format (UDF) file system implementation in the Linux
    kernel. An attacker with physical access to a system could use these flaws
    to cause a denial of service or escalate their privileges. (CVE-2012-3400,
    Low)
  • A flaw was found in the way the msg_namelen variable in the rds_recvmsg()
    function of the Linux kernel's Reliable Datagram Sockets (RDS) protocol
    implementation was initialized. A local, unprivileged user could use this
    flaw to leak kernel stack memory to user-space. (CVE-2012-3430, Low)

Red Hat would like to thank Pablo Neira Ayuso for reporting CVE-2012-3520;
Theodore Ts'o for reporting CVE-2012-4508; Shachar Raindel for reporting
CVE-2012-2133; and Kees Cook for reporting CVE-2012-0957. Upstream
acknowledges Dmitry Monakhov as the original reporter of CVE-2012-4508. The
CVE-2012-4565 issue was discovered by Rodrigo Freire of Red Hat, and the
CVE-2012-3430 issue was discovered by the Red Hat InfiniBand team.

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

Users should upgrade to these updated packages, which upgrade the kernel-rt
kernel to version kernel-rt-3.2.33-rt50, and 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/knowledge/articles/11258

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 - 817430 - CVE-2012-2133 kernel: use after free bug in "quota" handling
  • BZ - 820039 - CVE-2012-3430 kernel: recv{from,msg}() on an rds socket can leak kernel memory
  • BZ - 843130 - RFE kernel: net: mitigate blind reset attacks using RST and SYN bits
  • BZ - 843139 - CVE-2012-3400 kernel: udf: buffer overflow when parsing sparing table
  • BZ - 849734 - CVE-2012-3511 kernel: mm: use-after-free in madvise_remove()
  • BZ - 850449 - CVE-2012-3520 kernel: af_netlink: invalid handling of SCM_CREDENTIALS passing
  • BZ - 856243 - kernel-rt-debug potential deadlock
  • BZ - 859226 - iptables and other tools unable to log to rsyslog
  • BZ - 862877 - CVE-2012-0957 kernel: uts: stack memory leak in UNAME26
  • BZ - 864568 - Rebase MRG Realtime kernel to latest upstream 3.2 stable RT release
  • BZ - 869904 - CVE-2012-4508 kernel: ext4: AIO vs fallocate stale data exposure
  • BZ - 871848 - CVE-2012-4565 kernel: net: divide by zero in tcp algorithm illinois

CVEs

References

MRG Realtime 2

SRPM
kernel-rt-3.2.33-rt50.66.el6rt.src.rpm SHA-256: 81e0b74c896d18fc7bbff2de1537ef0b21e524640f37b4d86d81dbfbc4d95d97
x86_64
kernel-rt-3.2.33-rt50.66.el6rt.x86_64.rpm SHA-256: e6ae4f9f76b7a7f5f8f254c0b883664c41fd5ca8ba5eb57126c96a0401068877
kernel-rt-debug-3.2.33-rt50.66.el6rt.x86_64.rpm SHA-256: 9ba9dddb5fff07ececb7725f20afa6671f618cf7a1d6d1e7947fc5bbc066ee3c
kernel-rt-debug-debuginfo-3.2.33-rt50.66.el6rt.x86_64.rpm SHA-256: 01ceaff2f4d1f465d867db2901fa4dd82d35e58386d888ec3d8a993e18ce4878
kernel-rt-debug-devel-3.2.33-rt50.66.el6rt.x86_64.rpm SHA-256: c1c2ea8bc7dec588124a1944e16482c07762f72c4b4f20c2d0e9712524bfe06a
kernel-rt-debuginfo-3.2.33-rt50.66.el6rt.x86_64.rpm SHA-256: e2d420830ca25a8e4796f784f0df0494837249173782ac38a74f18220202b41a
kernel-rt-debuginfo-common-x86_64-3.2.33-rt50.66.el6rt.x86_64.rpm SHA-256: 9105e05e580d5439869c0a03a9447de5749797d3cb3054d2dcb93ce54a26e63f
kernel-rt-devel-3.2.33-rt50.66.el6rt.x86_64.rpm SHA-256: 7d06ae9f3d99e115d579cdd9227e3757927274462d15dc74039c91cdbd138760
kernel-rt-doc-3.2.33-rt50.66.el6rt.noarch.rpm SHA-256: 8edd30f0fc79e996832c01889bb0f6bbd4056edc78ddfc8790109b7d0f0d26ad
kernel-rt-firmware-3.2.33-rt50.66.el6rt.noarch.rpm SHA-256: 919d678ab02728b399c8f16a007803a2a1ab82b799b52cc7c7a8be623141e7d2
kernel-rt-trace-3.2.33-rt50.66.el6rt.x86_64.rpm SHA-256: 84fe9bf69c970163928be9ce851d61b1ab308ca3e31f6e3e2df43e2302334982
kernel-rt-trace-debuginfo-3.2.33-rt50.66.el6rt.x86_64.rpm SHA-256: c22da36b53399d9e901d06fd68d56cf04ad9ab03b51fa2dfb4f06c95ef45d7ed
kernel-rt-trace-devel-3.2.33-rt50.66.el6rt.x86_64.rpm SHA-256: daf945bbfed7238579b1eb63321a81c45c62e3d3850714ffe54b89252813a56f
kernel-rt-vanilla-3.2.33-rt50.66.el6rt.x86_64.rpm SHA-256: 461048a87ef8c2c4a9ef94a6b33d81cea282a51c0a9fae1c6926edc8f881f3eb
kernel-rt-vanilla-debuginfo-3.2.33-rt50.66.el6rt.x86_64.rpm SHA-256: ec745a1b47d716be4e0bab976c550261393378ff101e851b50ae76c50a798cff
kernel-rt-vanilla-devel-3.2.33-rt50.66.el6rt.x86_64.rpm SHA-256: 13a2cff48e37d79b6149388b1c4caa81e307b7bfd317e7b675d52f6bc95b8852
mrg-rt-release-3.2.33-rt50.66.el6rt.noarch.rpm SHA-256: a1809fb3af5d001fa977b8958b672f7b17bb3040b6a0cadff0cbe21effca6982

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