Synopsis

Important: kernel-rt security and bug fix update

Type/Severity

Security Advisory: Important

Topic

Updated kernel-rt packages that fix multiple security issues and one bug
are now available for Red Hat Enterprise MRG 2.4.

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.

• A flaw was found in the way IP packets with an Internet Header Length

(ihl) of zero were processed in the skb_flow_dissect() function in the
Linux kernel. A remote attacker could use this flaw to trigger an infinite
loop in the kernel, leading to a denial of service. (CVE-2013-4348,
Important)

• A flaw was found in the way the Linux kernel's IPv6 implementation

handled certain UDP packets when the UDP Fragmentation Offload (UFO)
feature was enabled. A remote attacker could use this flaw to crash the
system or, potentially, escalate their privileges on the system.
(CVE-2013-4387, Important)

• A flaw was found in the way the Linux kernel handled the creation of

temporary IPv6 addresses. If the IPv6 privacy extension was enabled
(/proc/sys/net/ipv6/conf/eth0/use_tempaddr set to '2'), an attacker on
the local network could disable IPv6 temporary address generation, leading
to a potential information disclosure. (CVE-2013-0343, Moderate)

• A flaw was found in the way the Linux kernel handled HID (Human Interface

Device) reports with an out-of-bounds Report ID. An attacker with physical
access to the system could use this flaw to crash the system or,
potentially, escalate their privileges on the system. (CVE-2013-2888,
Moderate)

• Heap-based buffer overflow flaws were found in the way the

Pantherlord/GreenAsia game controller driver, the Logitech force feedback
drivers, and the Logitech Unifying receivers driver handled HID reports.
An attacker with physical access to the system could use these flaws to
crash the system or, potentially, escalate their privileges on the system.
(CVE-2013-2892, CVE-2013-2893, CVE-2013-2895, Moderate)

• A NULL pointer dereference flaw was found in the way the N-Trig touch

screen driver handled HID reports. An attacker with physical access to the
system could use this flaw to crash the system, resulting in a denial of
service. (CVE-2013-2896, Moderate)

• An information leak flaw was found in the way the Linux kernel's device

mapper subsystem, under certain conditions, interpreted data written to
snapshot block devices. An attacker could use this flaw to read data from
disk blocks in free space, which are normally inaccessible. (CVE-2013-4299,
Moderate)

• A use-after-free flaw was found in the tun_set_iff() function in the

Universal TUN/TAP device driver implementation in the Linux kernel.
A privileged user could use this flaw to crash the system or, potentially,
further escalate their privileges on the system. (CVE-2013-4343, Moderate)

• An off-by-one flaw was found in the way the ANSI CPRNG implementation in

the Linux kernel processed non-block size aligned requests. This could lead
to random numbers being generated with less bits of entropy than expected
when ANSI CPRNG was used. (CVE-2013-4345, Moderate)

• A flaw was found in the way the Linux kernel's IPv6 SCTP implementation

interacted with the IPsec subsystem. This resulted in unencrypted SCTP
packets being sent over the network even though IPsec encryption was
enabled. An attacker able to inspect these SCTP packets could use this flaw
to obtain potentially sensitive information. (CVE-2013-4350, Moderate)

Red Hat would like to thank Fujitsu for reporting CVE-2013-4299 and Stephan
Mueller for reporting CVE-2013-4345. The CVE-2013-4348 issue was discovered
by Jason Wang of Red Hat.

Bug fix:

• RoCE appeared to be supported in the MRG Realtime kernel even when the

required user space packages from the HPN channel were not installed.
The Realtime kernel now checks for the HPN channel packages before exposing
the RoCE interfaces. RoCE devices appear as plain 10GigE devices if the
needed HPN channel user space packages are not installed. (BZ#1012993)

Users should upgrade to these updated packages, which upgrade the kernel-rt
kernel to version kernel-rt-3.8.13-rt14, 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 - 914664 - CVE-2013-0343 kernel: handling of IPv6 temporary addresses
• BZ - 1000360 - CVE-2013-2895 Kernel: HID: logitech-dj: heap overflow flaw
• BZ - 1000414 - CVE-2013-2893 Kernel: HID: LG: heap overflow flaw
• BZ - 1000429 - CVE-2013-2892 Kernel: HID: pantherlord: heap overflow flaw
• BZ - 1000451 - CVE-2013-2888 Kernel: HID: memory corruption flaw
• BZ - 1000494 - CVE-2013-2896 Kernel: HID: ntrig: NULL pointer dereference
• BZ - 1004233 - CVE-2013-4299 kernel: dm: dm-snapshot data leak
• BZ - 1007690 - CVE-2013-4345 kernel: ansi_cprng: off by one error in non-block size request
• BZ - 1007733 - CVE-2013-4343 Kernel: net: use-after-free TUNSETIFF
• BZ - 1007872 - CVE-2013-4350 kernel: net: sctp: ipv6 ipsec encryption bug in sctp_v6_xmit
• BZ - 1007939 - CVE-2013-4348 kernel: net: deadloop path in skb_flow_dissect()
• BZ - 1011927 - CVE-2013-4387 Kernel: net: IPv6: panic when UFO=On for an interface
• BZ - 1012993 - mlx4: Don't show RoCE interfaces if the hpn channel is not installed

CVEs

• CVE-2013-4299
• CVE-2013-0343
• CVE-2013-4345
• CVE-2013-4343
• CVE-2013-4348
• CVE-2013-2895
• CVE-2013-2896
• CVE-2013-2888
• CVE-2013-4387
• CVE-2013-2892
• CVE-2013-2893
• CVE-2013-4350

References