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 2.3.

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 buffer overflow flaw was found in the way UTF-8 characters were
  converted to UTF-16 in the utf8s_to_utf16s() function of the Linux kernel's
  FAT file system implementation. A local user able to mount a FAT file
  system with the "utf8=1" option could use this flaw to crash the system or,
  potentially, to escalate their privileges. (CVE-2013-1773, Important)
  
• It was found that the RHSA-2012:0333 update did not correctly fix the
  CVE-2011-4131 issue. A malicious Network File System version 4 (NFSv4)
  server could return a crafted reply to a GETACL request, causing a denial
  of service on the client. (CVE-2012-2375, Moderate)
  
• A memory disclosure flaw was found in the way the load_script() function
  in the binfmt_script binary format handler handled excessive recursions. A
  local, unprivileged user could use this flaw to leak kernel stack memory to
  user-space by executing specially-crafted scripts. (CVE-2012-4530, Low)
  
• A flaw was found in the way file permission checks for the "/dev/kmsg"
  file were performed in restricted root environments (for example, when
  using a capability-based security model). A local user able to write to
  this file could cause a denial of service. (CVE-2013-1772, Low)
  

The CVE-2012-2375 issue was discovered by Jian Li of Red Hat.

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-3.6.11-rt28, correct these issues, and fix the
bugs noted in the Red Hat Enterprise MRG 2 Technical Notes. 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 - 773017 - kernel-rt-{debug,trace}-debuginfo conflicts against kernel-debuginfo
• BZ - 822869 - CVE-2012-2375 kernel: incomplete fix for CVE-2011-4131
• BZ - 866596 - RFE: rebase to 3.4 or greater kernel [mrg2.3]
• BZ - 866600 - RFE: adding PTP kernel support as a Tech Preview [mrg2.3]
• BZ - 868285 - CVE-2012-4530 kernel: stack disclosure in binfmt_script load_script()
• BZ - 916075 - CVE-2013-1772 kernel: call_console_drivers() function log prefix stripping DoS
• BZ - 916115 - CVE-2013-1773 kernel: VFAT slab-based buffer overflow

CVEs

• CVE-2012-2375
• CVE-2012-4530
• CVE-2013-1773
• CVE-2013-1772

References

• https://access.redhat.com/security/updates/classification/#important
• https://rhn.redhat.com/errata/RHSA-2012-0333.html
• https://access.redhat.com/knowledge/docs/en-US/Red_Hat_Enterprise_MRG/2/html/Technical_Notes/RHSA-2013-0566.html

MRG Realtime 2

SRPM
kernel-rt-3.6.11-rt28.20.el6rt.src.rpm	SHA-256: 6cd532af109c912f6ef0ac2c2696aa34112679116b5a3d44be661e0e4a43cb01
x86_64
kernel-rt-3.6.11-rt28.20.el6rt.x86_64.rpm	SHA-256: 1c69506775e57587c8cae92fdf566af0f39df127a4812cc5b1aaff7fa64ecf48
kernel-rt-debug-3.6.11-rt28.20.el6rt.x86_64.rpm	SHA-256: cbd523d58290a5f74a861fd13732a347d9d4289454fb2af853653a0036b17711
kernel-rt-debug-debuginfo-3.6.11-rt28.20.el6rt.x86_64.rpm	SHA-256: 93562e4d987c6876547f1258fa79d8e027e546a828eac3c3a2d07172759a187f
kernel-rt-debug-devel-3.6.11-rt28.20.el6rt.x86_64.rpm	SHA-256: 47a8815b957e6c109c8a1ce142491c6b6364bfbff53c19cd95e2c8890d0b2186
kernel-rt-debuginfo-3.6.11-rt28.20.el6rt.x86_64.rpm	SHA-256: ed956a177622b962aaf9a477d591b55e18c46ec6497f2b4003fe3273cf078cf2
kernel-rt-debuginfo-common-x86_64-3.6.11-rt28.20.el6rt.x86_64.rpm	SHA-256: 0ad38a2db5e71b2bd6b181cb1eab73a584710b91d0f5c2c1c689aaae3e529bdb
kernel-rt-devel-3.6.11-rt28.20.el6rt.x86_64.rpm	SHA-256: 50b6825dbb45931865ae928407b8b1339709e7002b96d3a19736fd194b8f0225
kernel-rt-doc-3.6.11-rt28.20.el6rt.noarch.rpm	SHA-256: 90ffac48ed9b21fdb283f3a09324d3defce4e04d01c9dc264d258df0f462be07
kernel-rt-firmware-3.6.11-rt28.20.el6rt.noarch.rpm	SHA-256: f13ab3f8bbd946d0964bb3cead8cce34bec7b702dc188b18871855babd386413
kernel-rt-trace-3.6.11-rt28.20.el6rt.x86_64.rpm	SHA-256: fa0ef07e16ad3c2e0e385840c6c15d6be9cd1ea137e5093c80ac0cbcc4c567a5
kernel-rt-trace-debuginfo-3.6.11-rt28.20.el6rt.x86_64.rpm	SHA-256: eeff614bf1b44a41910481fbb2834ef6acee2ad815564e92d025980ce3a5f40f
kernel-rt-trace-devel-3.6.11-rt28.20.el6rt.x86_64.rpm	SHA-256: 0522dfa8b9500c8e8cf392fb3a603bc5de650f815732bfe432aeff58984c650b
kernel-rt-vanilla-3.6.11-rt28.20.el6rt.x86_64.rpm	SHA-256: 283cfeb837f7d9bbc3ec173af98eba2bff15c0a36896cf2dcc64da1f51573b76
kernel-rt-vanilla-debuginfo-3.6.11-rt28.20.el6rt.x86_64.rpm	SHA-256: a9e96f9e40d3bb9aab7a8f81d10eeedfd1ae49b3e06fa819e695cc13cac0e62e
kernel-rt-vanilla-devel-3.6.11-rt28.20.el6rt.x86_64.rpm	SHA-256: 8019090273c8a20868975369a88fd12a092d5a0064cd3ce611362d0c1a5b7343
mrg-rt-release-3.6.11-rt28.20.el6rt.noarch.rpm	SHA-256: 04344d12c450ef2e4ac72869bbad4910c911134a90bdf348c792392cdea9bda2