RHEL 6 : kernel (RHSA-2010:0842)

This script is Copyright (C) 2010-2014 Tenable Network Security, Inc.


Synopsis :

The remote Red Hat host is missing one or more security updates.

Description :

Updated kernel packages that fix multiple security issues and several
bugs are now available for Red Hat Enterprise Linux 6.

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.

[Updated 22 November 2010] The packages list in this erratum has been
updated to include four missing debuginfo-common packages (one per
architecture). No changes have been made to the original packages.

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

This update fixes the following security issues :

* 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)

* compat_alloc_user_space() in the Linux kernel 32/64-bit
compatibility layer implementation was missing sanity checks. This
function could be abused in other areas of the Linux kernel if its
length argument can be controlled from user-space. On 64-bit systems,
a local, unprivileged user could use this flaw to escalate their
privileges. (CVE-2010-3081, Important)

* A buffer overflow flaw in niu_get_ethtool_tcam_all() in the niu
Ethernet driver in the Linux kernel, could allow a local user to cause
a denial of service or escalate their privileges. (CVE-2010-3084,
Important)

* A flaw in the IA32 system call emulation provided in 64-bit Linux
kernels could allow a local user to escalate their privileges.
(CVE-2010-3301, 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 was found 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)

* A function in the Linux kernel's Reliable Datagram Sockets (RDS)
protocol implementation was missing sanity checks, which could allow a
local, unprivileged user to escalate their privileges. (CVE-2010-3904,
Important)

* A flaw in drm_ioctl() in the Linux kernel's Direct Rendering Manager
(DRM) implementation could allow a local, unprivileged user to cause
an information leak. (CVE-2010-2803, Moderate)

* It was found that wireless drivers might not always clear allocated
buffers when handling a driver-specific IOCTL information request. A
local user could trigger this flaw to cause an information leak.
(CVE-2010-2955, Moderate)

* A NULL pointer dereference flaw in ftrace_regex_lseek() in the Linux
kernel's ftrace implementation could allow a local, unprivileged user
to cause a denial of service. Note: The debugfs file system must be
mounted locally to exploit this issue. It is not mounted by default.
(CVE-2010-3079, Moderate)

* A flaw in the Linux kernel's packet writing driver could be
triggered via the PKT_CTRL_CMD_STATUS IOCTL request, possibly allowing
a local, unprivileged user with access to '/dev/pktcdvd/control' to
cause an information leak. Note: By default, only users in the cdrom
group have access to '/dev/pktcdvd/control'. (CVE-2010-3437, Moderate)

* A flaw was found in the way KVM (Kernel-based Virtual Machine)
handled the reloading of fs and gs segment registers when they had
invalid selectors. A privileged host user with access to '/dev/kvm'
could use this flaw to crash the host. (CVE-2010-3698, Moderate)

Red Hat would like to thank Kees Cook for reporting CVE-2010-2962 and
CVE-2010-2803
Ben Hawkes for reporting CVE-2010-3081 and
CVE-2010-3301
Dan Rosenberg for reporting CVE-2010-3442,
CVE-2010-3705, CVE-2010-3904, and CVE-2010-3437
and Robert Swiecki
for reporting CVE-2010-3079.

This update also fixes several 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 contain
backported patches to correct these issues. The system must be
rebooted for this update to take effect.

See also :

https://www.redhat.com/security/data/cve/CVE-2010-2803.html
https://www.redhat.com/security/data/cve/CVE-2010-2955.html
https://www.redhat.com/security/data/cve/CVE-2010-2962.html
https://www.redhat.com/security/data/cve/CVE-2010-3079.html
https://www.redhat.com/security/data/cve/CVE-2010-3081.html
https://www.redhat.com/security/data/cve/CVE-2010-3084.html
https://www.redhat.com/security/data/cve/CVE-2010-3301.html
https://www.redhat.com/security/data/cve/CVE-2010-3432.html
https://www.redhat.com/security/data/cve/CVE-2010-3437.html
https://www.redhat.com/security/data/cve/CVE-2010-3442.html
https://www.redhat.com/security/data/cve/CVE-2010-3698.html
https://www.redhat.com/security/data/cve/CVE-2010-3705.html
https://www.redhat.com/security/data/cve/CVE-2010-3904.html
http://www.nessus.org/u?d2334068
http://rhn.redhat.com/errata/RHSA-2010-0842.html

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 8.3
(CVSS2#AV:A/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 7.2
(CVSS2#E:ND/RL:OF/RC:C)
Public Exploit Available : true