8.3 - RHSA-2010:0958

Problem Description:

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.

2. Relevant releases/architectures:

MRG Realtime for RHEL 5 Server - i386, noarch, x86_64

3. Description:

The kernel-rt packages contain the Linux kernel, the core of any Linux operating system.

Security fixes:

* Missing sanity checks in the Intel i915 driver in the Linux kernel could allow a local, unprivileged user to escalate their privileges. (CVE-2010-2962, Important)

* A flaw in sctp_packet_config() in the Linux kernel's Stream Control Transmission Protocol (SCTP) implementation could allow a remote attacker to cause a denial of service. (CVE-2010-3432, Important)

* A missing integer overflow check in snd_ctl_new() in the Linux kernel's sound subsystem could allow a local, unprivileged user on a 32-bit system to cause a denial of service or escalate their privileges. (CVE-2010-3442, Important)

* A flaw in sctp_auth_asoc_get_hmac() in the Linux kernel's SCTP implementation. When iterating through the hmac_ids array, it did not reset the last id element if it was out of range. This could allow a remote attacker to cause a denial of service. (CVE-2010-3705, Important)

* Missing sanity checks in setup_arg_pages() in the Linux kernel. When making the size of the argument and environment area on the stack very large, it could trigger a BUG_ON(), resulting in a local denial of service. (CVE-2010-3858, Moderate)

* A flaw in ethtool_get_rxnfc() in the Linux kernel's ethtool IOCTL handler. When it is called with a large info.rule_cnt, it could allow a local user to cause an information leak. (CVE-2010-3861, Moderate)

* A flaw in bcm_connect() in the Linux kernel's Controller Area Network (CAN) Broadcast Manager. On 64-bit systems, writing the socket address may overflow the procname character array. (CVE-2010-3874, Moderate)

* A flaw in inet_csk_diag_dump() in the Linux kernel's module for monitoring the sockets of INET transport protocols. By sending a netlink message with certain bytecode, a local, unprivileged user could cause a denial of service. (CVE-2010-3880, Moderate)

* Missing sanity checks in gdth_ioctl_alloc() in the gdth driver in the Linux kernel, could allow a local user with access to "/dev/gdth" on a 64-bit system to cause a denial of service or escalate their privileges. (CVE-2010-4157, Moderate)

* A use-after-free flaw in the mprotect() system call could allow a local, unprivileged user to cause a local denial of service. (CVE-2010-4169, Moderate)

* Missing initialization flaws in the Linux kernel could lead to information leaks. (CVE-2010-3876, CVE-2010-4072, CVE-2010-4073, CVE-2010-4074, CVE-2010-4075, CVE-2010-4077, CVE-2010-4079, CVE-2010-4080, CVE-2010-4082, CVE-2010-4083, CVE-2010-4158, Low)

Red Hat would like to thank Kees Cook for reporting CVE-2010-2962, CVE-2010-3861, and CVE-2010-4072; Dan Rosenberg for reporting CVE-2010-3442, CVE-2010-3705, CVE-2010-3874, CVE-2010-4073, CVE-2010-4074, CVE-2010-4075, CVE-2010-4077, CVE-2010-4079, CVE-2010-4080, CVE-2010-4082, CVE-2010-4083, and CVE-2010-4158; Brad Spengler for reporting CVE-2010-3858; Nelson Elhage for reporting CVE-2010-3880; and Vasiliy Kulikov for reporting CVE-2010-3876.

Bug fixes:

* A vulnerability in the 32-bit compatibility code for the VIDIOCSMICROCODE IOCTL in the Video4Linux implementation. It does not affect Red Hat Enterprise MRG, but as a preventive measure, this update removes the code. Red Hat would like to thank Kees Cook for reporting this vulnerability. (BZ#642469)

* The kernel-rt spec file was missing the crypto, drm, generated, and trace header directories when generating the kernel-rt-devel package, resulting in out-of-tree modules failing to build. (BZ#608784)

* On computers without a supported Performance Monitoring Unit, a crash would occur when running the "perf top" command, and occasionally other perf commands. perf software events are now marked as IRQ safe to avoid this crash. (BZ#647434)

Users should upgrade to these updated packages, which contain backported patches to correct these issues. The system must be rebooted for this update to take effect.

4. 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 http://kbase.redhat.com/faq/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.

5. Bugs fixed (http://bugzilla.redhat.com/):

608784 - cannot build third-party modules based upon 2.6.33.5-rt* packages 637675 - CVE-2010-3432 kernel: sctp: do not reset the packet during sctp_packet_config 637688 - CVE-2010-2962 kernel: arbitrary kernel memory write via i915 GEM ioctl 638478 - CVE-2010-3442 kernel: prevent heap corruption in snd_ctl_new() 640036 - CVE-2010-3705 kernel: sctp memory corruption in HMAC handling 642469 - CVE-2010-2963 kernel: v4l: VIDIOCSMICROCODE arbitrary write [mrg-1.3] 645222 - CVE-2010-3858 kernel: setup_arg_pages: diagnose excessive argument size 646725 - CVE-2010-3861 kernel: heap contents leak from ETHTOOL_GRXCLSRLALL 647434 - perf: Mark software events as irqsafe 648656 - CVE-2010-4072 kernel: ipc/shm.c: reading uninitialized stack memory 648658 - CVE-2010-4073 kernel: ipc/compat*.c: reading uninitialized stack memory 648659 - CVE-2010-4074 kernel: drivers/usb/serial/mos*.c: reading uninitialized stack memory 648660 - CVE-2010-4075 kernel: drivers/serial/serial_core.c: reading uninitialized stack memory 648663 - CVE-2010-4077 kernel: drivers/char/nozomi.c: reading uninitialized stack memory 648666 - CVE-2010-4079 kernel: drivers/video/ivtv/ivtvfb.c: reading uninitialized stack memory 648669 - CVE-2010-4080 kernel: drivers/sound/pci/rme9652/hdsp.c: reading uninitialized stack memory 648671 - CVE-2010-4082 kernel: drivers/video/via/ioctl.c: reading uninitialized stack memory 648673 - CVE-2010-4083 kernel: ipc/sem.c: reading uninitialized stack memory 649695 - CVE-2010-3874 kernel: CAN info leak/minor heap overflow 649715 - CVE-2010-3876 kernel: net/packet/af_packet.c: reading uninitialized stack memory 651147 - CVE-2010-4157 kernel: gdth: integer overflow in ioc_general() 651264 - CVE-2010-3880 kernel: logic error in INET_DIAG bytecode auditing 651671 - CVE-2010-4169 kernel: perf bug 651698 - CVE-2010-4158 kernel: socket filters infoleak