RHSA-2011:0500 - Security Advisory

Topic

Updated kernel-rt packages that fix multiple security issues and various
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.

This update fixes the following security issues:

• A race condition in the way the Linux kernel's InfiniBand implementation

set up new connections could allow a remote user to cause a denial of
service. (CVE-2011-0695, Important)

• An integer signedness flaw in drm_modeset_ctl() could allow a local,

unprivileged user to cause a denial of service or escalate their
privileges. (CVE-2011-1013, Important)

• A flaw in dccp_rcv_state_process() could allow a remote attacker to cause

a denial of service, even when the socket was already closed.
(CVE-2011-1093, Important)

• A missing validation of a null-terminated string data structure element

in bnep_sock_ioctl() could allow a local user to cause an information leak
or a denial of service. (CVE-2011-1079, Moderate)

• A flaw in the Linux kernel's Event Poll (epoll) implementation could

allow a local, unprivileged user to cause a denial of service.
(CVE-2011-1082, Moderate)

• A missing initialization flaw in the XFS file system implementation could

lead to an information leak. (CVE-2011-0711, Low)

• The start_code and end_code values in "/proc/[pid]/stat" were not

protected. In certain scenarios, this flaw could be used to defeat Address
Space Layout Randomization (ASLR). (CVE-2011-0726, Low)

• A missing validation check in the Linux kernel's mac_partition()

implementation, used for supporting file systems created on Mac OS
operating systems, could allow a local attacker to cause a denial of
service by mounting a disk that contains specially-crafted partitions.
(CVE-2011-1010, Low)

• A flaw in dev_load() could allow a local user who has the CAP_NET_ADMIN

capability to load arbitrary modules from "/lib/modules/", instead of only
netdev modules. (CVE-2011-1019, Low)

• A missing initialization flaw in sco_sock_getsockopt_old() could allow a

local, unprivileged user to cause an information leak. (CVE-2011-1078, Low)

• A buffer overflow flaw in the DEC Alpha OSF partition implementation in

the Linux kernel could allow a local attacker to cause an information leak
by mounting a disk that contains specially-crafted partition tables.
(CVE-2011-1163, Low)

• Missing validations of null-terminated string data structure elements

in the do_replace(), compat_do_replace(), do_ipt_get_ctl(),
do_ip6t_get_ctl(), and do_arpt_get_ctl() functions could allow a local user
who has the CAP_NET_ADMIN capability to cause an information leak.
(CVE-2011-1170, CVE-2011-1171, CVE-2011-1172, CVE-2011-1080, Low)

Red Hat would like to thank Jens Kuehnel for reporting CVE-2011-0695;
Vasiliy Kulikov for reporting CVE-2011-1079, CVE-2011-1019, CVE-2011-1078,
CVE-2011-1170, CVE-2011-1171, CVE-2011-1172, and CVE-2011-1080; Nelson
Elhage for reporting CVE-2011-1082; Dan Rosenberg for reporting
CVE-2011-0711; Kees Cook for reporting CVE-2011-0726; and Timo Warns for
reporting CVE-2011-1010 and CVE-2011-1163.

This update also fixes various bugs. Documentation for these bug fixes 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 2.6.33.9-rt31, 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/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 - 653648 - CVE-2011-0695 kernel: panic in ib_cm:cm_work_handler
• BZ - 677260 - CVE-2011-0711 kernel: xfs: prevent leaking uninitialized stack memory in FSGEOMETRY_V1
• BZ - 679282 - CVE-2011-1010 kernel: fs/partitions: Validate map_count in Mac partition tables
• BZ - 679925 - CVE-2011-1013 kernel: drm_modeset_ctl signedness issue
• BZ - 680360 - CVE-2011-1019 kernel: CAP_SYS_MODULE bypass via CAP_NET_ADMIN
• BZ - 681259 - CVE-2011-1078 kernel: bt sco_conninfo infoleak
• BZ - 681260 - CVE-2011-1079 kernel: bnep device field missing NULL terminator
• BZ - 681262 - CVE-2011-1080 kernel: ebtables stack infoleak
• BZ - 681575 - CVE-2011-1082 kernel: potential kernel deadlock when creating circular epoll file structures
• BZ - 682954 - CVE-2011-1093 kernel: dccp: fix oops on Reset after close
• BZ - 684569 - CVE-2011-0726 kernel: proc: protect mm start_code/end_code in /proc/pid/stat
• BZ - 688021 - CVE-2011-1163 kernel: fs/partitions: Corrupted OSF partition table infoleak
• BZ - 689321 - CVE-2011-1170 ipv4: netfilter: arp_tables: fix infoleak to userspace
• BZ - 689327 - CVE-2011-1171 ipv4: netfilter: ip_tables: fix infoleak to userspace
• BZ - 689345 - CVE-2011-1172 ipv6: netfilter: ip6_tables: fix infoleak to userspace
• BZ - 692665 - bnx2x NICs occassionally do not come up on boot

CVEs

• CVE-2011-1171
• CVE-2011-1163
• CVE-2011-1172
• CVE-2011-1078
• CVE-2011-0726
• CVE-2011-1082
• CVE-2011-1080
• CVE-2011-1010
• CVE-2011-0695
• CVE-2011-0711
• CVE-2011-1013
• CVE-2011-1079
• CVE-2011-1170
• CVE-2011-1093
• CVE-2011-1019

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/RHSA-2011-0500.html