RHSA-2013:1264 - Security Advisory

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 heap-based buffer overflow flaw was found in the Linux kernel's iSCSI

target subsystem. A remote attacker could use a specially-crafted iSCSI
request to cause a denial of service on a system or, potentially, escalate
their privileges on that system. (CVE-2013-2850, Important)

• A flaw was found in the Linux kernel's Performance Events implementation.

On systems with certain Intel processors, a local, unprivileged user could
use this flaw to cause a denial of service by leveraging the perf subsystem
to write into the reserved bits of the OFFCORE_RSP_0 and OFFCORE_RSP_1
model-specific registers. (CVE-2013-2146, Moderate)

• An invalid pointer dereference flaw was found in the Linux kernel's

TCP/IP protocol suite implementation. A local, unprivileged user could use
this flaw to crash the system or, potentially, escalate their privileges on
the system by using sendmsg() with an IPv6 socket connected to an IPv4
destination. (CVE-2013-2232, Moderate)

• Two flaws were found in the way the Linux kernel's TCP/IP protocol suite

implementation handled IPv6 sockets that used the UDP_CORK option. A local,
unprivileged user could use these flaws to cause a denial of service.
(CVE-2013-4162, CVE-2013-4163, Moderate)

• A flaw was found in the Linux kernel's Chipidea USB driver. A local,

unprivileged user could use this flaw to cause a denial of service.
(CVE-2013-2058, Low)

• Information leak flaws in the Linux kernel could allow a privileged,

local user to leak kernel memory to user-space. (CVE-2013-2147,
CVE-2013-2164, CVE-2013-2234, CVE-2013-2237, Low)

• Information leak flaws in the Linux kernel could allow a local,

unprivileged user to leak kernel memory to user-space. (CVE-2013-2141,
CVE-2013-2148, Low)

• A format string flaw was found in the Linux kernel's block layer. A

privileged, local user could potentially use this flaw to escalate their
privileges to kernel level (ring0). (CVE-2013-2851, Low)

• A format string flaw was found in the b43_do_request_fw() function in the

Linux kernel's b43 driver implementation. A local user who is able to
specify the "fwpostfix" b43 module parameter could use this flaw to cause a
denial of service or, potentially, escalate their privileges.
(CVE-2013-2852, Low)

• A NULL pointer dereference flaw was found in the Linux kernel's ftrace

and function tracer implementations. A local user who has the CAP_SYS_ADMIN
capability could use this flaw to cause a denial of service.
(CVE-2013-3301, Low)

Red Hat would like to thank Kees Cook for reporting CVE-2013-2850,
CVE-2013-2851, and CVE-2013-2852; and Hannes Frederic Sowa for reporting
CVE-2013-4162 and CVE-2013-4163.

This update also fixes the following bugs:

• The following drivers have been updated, fixing a number of bugs:

myri10ge, bna, enic, mlx4, bgmac, bcma, cxgb3, cxgb4, qlcnic, r8169,
be2net, e100, e1000, e1000e, igb, ixgbe, brcm80211, cpsw, pch_gbe,
bfin_mac, bnx2x, bnx2, cnic, tg3, and sfc. (BZ#974138)

• The realtime kernel was not built with the CONFIG_NET_DROP_WATCH kernel

configuration option enabled. As such, attempting to run the dropwatch
command resulted in the following error:

Unable to find NET_DM family, dropwatch can't work
Cleaning up on socket creation error

With this update, the realtime kernel is built with the
CONFIG_NET_DROP_WATCH option, allowing dropwatch to work as expected.
(BZ#979417)

Users should upgrade to these updated packages, which upgrade the kernel-rt
kernel to version kernel-rt-3.6.11.5-rt37, 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/site/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 - 952197 - CVE-2013-3301 Kernel: tracing: NULL pointer dereference
• BZ - 959210 - CVE-2013-2058 Kernel: usb: chipidea: Allow disabling streaming not just in udc mode
• BZ - 968036 - CVE-2013-2850 kernel: iscsi-target: heap buffer overflow on large key error
• BZ - 969515 - CVE-2013-2851 kernel: block: passing disk names as format strings
• BZ - 969518 - CVE-2013-2852 kernel: b43: format string leaking into error msgs
• BZ - 970873 - CVE-2013-2141 Kernel: signal: information leak in tkill/tgkill
• BZ - 971242 - CVE-2013-2147 Kernel: cpqarray/cciss: information leak via ioctl
• BZ - 971258 - CVE-2013-2148 Kernel: fanotify: info leak in copy_event_to_user
• BZ - 971309 - CVE-2013-2146 Kernel: perf/x86: offcore_rsp valid mask for SNB/IVB
• BZ - 973100 - CVE-2013-2164 Kernel: information leak in cdrom driver
• BZ - 974138 - MRG 2.3 kernel drivers update
• BZ - 980995 - CVE-2013-2234 Kernel: net: information leak in AF_KEY notify
• BZ - 981220 - CVE-2013-2237 Kernel: net: af_key: initialize satype in key_notify_policy_flush
• BZ - 981552 - CVE-2013-2232 Kernel: ipv6: using ipv4 vs ipv6 structure during routing lookup in sendmsg
• BZ - 983603 - update RT specfile references of version.h to vermagic.h
• BZ - 987627 - CVE-2013-4162 Kernel: net: panic while pushing pending data out of a IPv6 socket with UDP_CORK enabled
• BZ - 987633 - CVE-2013-4163 Kernel: net: panic while appending data to a corked IPv6 socket in ip6_append_data_mtu

CVEs

• CVE-2013-3301
• CVE-2013-2852
• CVE-2013-2164
• CVE-2013-2147
• CVE-2013-2232
• CVE-2013-2234
• CVE-2013-2237
• CVE-2013-2146
• CVE-2013-2850
• CVE-2013-2148
• CVE-2013-2141
• CVE-2013-2058
• CVE-2013-2851
• CVE-2013-4162
• CVE-2013-4163

References

• https://access.redhat.com/security/updates/classification/#important