RHSA-2011:0330 - Security Advisory

Topic

Updated kernel-rt packages that fix multiple security issues and three bugs
are now available for Red Hat Enterprise MRG 1.3.

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.

Security fixes:

• Missing boundary checks in the PPP over L2TP sockets implementation could

allow a local, unprivileged user to cause a denial of service or escalate
their privileges. (CVE-2010-4160, Important)

• Integer overflow in ib_uverbs_poll_cq() could allow a local, unprivileged

user to cause a denial of service or escalate their privileges.
(CVE-2010-4649, Important)

• Missing boundary check in dvb_ca_ioctl() in the av7110 module. On systems

using old DVB cards requiring the av7110 module, a local, unprivileged user
could use this flaw to cause a denial of service or escalate their
privileges. (CVE-2011-0521, Important)

• Flaw in tcf_act_police_dump() in the network traffic policing

implementation could allow a local, unprivileged user to cause an
information leak. (CVE-2010-3477, Moderate)

• Missing boundary checks in the block layer implementation could allow a

local, unprivileged user to cause a denial of service. (CVE-2010-4162,
CVE-2010-4163, CVE-2010-4668, Moderate)

• Divide-by-zero flaw in tcp_select_initial_window() in the Linux kernel's

TCP/IP protocol suite implementation could allow a local, unprivileged user
to cause a denial of service. (CVE-2010-4165, Moderate)

• NULL pointer dereference flaw in the Bluetooth HCI UART driver could

allow a local, unprivileged user to cause a denial of service.
(CVE-2010-4242, Moderate)

• Flaw in the CPU time clocks implementation for the POSIX clock interface

could allow a local, unprivileged user to cause a denial of service.
(CVE-2010-4248, Moderate)

• Flaw in the garbage collector for AF_UNIX sockets could allow a local,

unprivileged user to trigger a denial of service (out-of-memory condition).
(CVE-2010-4249, Moderate)

• Memory leak in the inotify_init() system call. In some cases, it could

leak a group, which could allow a local, unprivileged user to eventually
cause a denial of service. (CVE-2010-4250, Moderate)

• /sys/kernel/debug/acpi/custom_method had world-writable permissions,

which could allow a local, unprivileged user to escalate their privileges.
Note: The debugfs file system must be mounted locally to exploit this
issue. It is not mounted by default. (CVE-2010-4347, Moderate)

• Heap overflow in iowarrior_write() could allow a user with access to an

IO-Warrior USB device to cause a denial of service or escalate their
privileges. (CVE-2010-4656, Moderate)

• Missing security check in the Linux kernel's implementation of the

install_special_mapping routine could allow a local, unprivileged user to
bypass the mmap_min_addr protection mechanism. (CVE-2010-4346, Low)

• Information leak in bcm_connect() in the Controller Area Network (CAN)

Broadcast Manager implementation could allow a local, unprivileged user to
leak kernel mode addresses in /proc/net/can-bcm. (CVE-2010-4565, Low)

• A logic error in orinoco_ioctl_set_auth() in the Linux kernel's ORiNOCO

wireless extensions support implementation could render TKIP
countermeasures ineffective when it is enabled, as it enabled the card
instead of shutting it down. (CVE-2010-4648, Low)

• Missing initialization flaw in ethtool_get_regs() could allow a local

user who has the CAP_NET_ADMIN capability to cause an information leak.
(CVE-2010-4655, Low)

• Flaw in ib_uverbs_poll_cq() could allow a local, unprivileged user to

cause an information leak. (CVE-2011-1044, Low)

Red Hat would like to thank Dan Rosenberg for reporting CVE-2010-4160,
CVE-2010-4162, CVE-2010-4163, CVE-2010-4668, and CVE-2010-4565; Steve Chen
for reporting CVE-2010-4165; Alan Cox for reporting CVE-2010-4242; Vegard
Nossum for reporting CVE-2010-4249 and CVE-2010-4250; Kees Cook for
reporting CVE-2010-4656 and CVE-2010-4655; and Tavis Ormandy for reporting
CVE-2010-4346.

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

Solution

Users should upgrade to these updated kernel-rt packages. They are
based on upstream version 2.6.33.7.2-rt30 (despite package naming) and
correct these issues. The system must be rebooted for this update to
take effect.

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 1 x86_64
• MRG Realtime 1 i386

Fixes

• BZ - 636386 - CVE-2010-3477 kernel: net/sched/act_police.c infoleak
• BZ - 641410 - CVE-2010-4242 kernel: missing tty ops write function presence check in hci_uart_tty_open()
• BZ - 651892 - CVE-2010-4160 kernel: L2TP send buffer allocation size overflows
• BZ - 652508 - CVE-2010-4165 kernel: possible kernel oops from user MSS
• BZ - 652529 - CVE-2010-4162 kernel: bio: integer overflow page count when mapping/copying user data
• BZ - 652957 - CVE-2010-4163 CVE-2010-4668 kernel: panic when submitting certain 0-length I/O requests
• BZ - 656264 - CVE-2010-4248 kernel: posix-cpu-timers: workaround to suppress the problems with mt exec
• BZ - 656756 - CVE-2010-4249 kernel: unix socket local dos
• BZ - 656830 - CVE-2010-4250 kernel: inotify memory leak
• BZ - 659574 - CVE-2010-4258 kernel: failure to revert address limit override in OOPS error path [mrg-1.3]
• BZ - 662189 - CVE-2010-4346 kernel: install_special_mapping skips security_file_mmap check
• BZ - 663542 - CVE-2010-4347 kernel: local privilege escalation via /sys/kernel/debug/acpi/custom_method
• BZ - 664544 - CVE-2010-4565 kernel: CAN info leak
• BZ - 667907 - CVE-2010-4648 kernel: orinoco: fix TKIP countermeasure behaviour
• BZ - 667916 - CVE-2010-4649 CVE-2011-1044 kernel: IB/uverbs: Handle large number of entries in poll CQ
• BZ - 672398 - CVE-2011-0521 kernel: av7110 negative array offset
• BZ - 672420 - CVE-2010-4656 kernel: iowarrior usb device heap overflow
• BZ - 672428 - CVE-2010-4655 kernel: heap contents leak for CAP_NET_ADMIN via ethtool ioctl

CVEs

• CVE-2011-1044
• CVE-2010-4250
• CVE-2010-4565
• CVE-2010-4648
• CVE-2010-4656
• CVE-2010-4649
• CVE-2010-4346
• CVE-2010-4347
• CVE-2010-4165
• CVE-2011-0521
• CVE-2010-4655
• CVE-2010-3477
• CVE-2010-4249
• CVE-2010-4668
• CVE-2010-4160
• CVE-2010-4162
• CVE-2010-4163
• CVE-2010-4248
• CVE-2010-4242

References

• https://access.redhat.com/security/updates/classification/#important
• http://docs.redhat.com/docs/en-US/Red_Hat_Enterprise_MRG/1.3/html/Technical_Notes/chap-Package_Updates.html#RHSA-2011-0330