RHEL 6 : MRG (RHSA-2012:1491)

This script is Copyright (C) 2014-2017 Tenable Network Security, Inc.


Synopsis :

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

Description :

Updated kernel-rt packages that fix several security issues and
multiple bugs are now available for Red Hat Enterprise MRG 2.2.

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.

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

This update fixes the following security issues :

* A flaw was found in the way Netlink messages without SCM_CREDENTIALS
(used for authentication) data set were handled. When not explicitly
set, the data was sent but with all values set to 0, including the
process ID and user ID, causing the Netlink message to appear as if it
were sent with root privileges. A local, unprivileged user could use
this flaw to send spoofed Netlink messages to an application, possibly
resulting in the application performing privileged operations if it
relied on SCM_CREDENTIALS data for the authentication of Netlink
messages. (CVE-2012-3520, Important)

* A race condition was found in the way asynchronous I/O and
fallocate() interacted when using the ext4 file system. A local,
unprivileged user could use this flaw to expose random data from an
extent whose data blocks have not yet been written, and thus contain
data from a deleted file. (CVE-2012-4508, Important)

* A use-after-free flaw was found in the Linux kernel's memory
management subsystem in the way quota handling for huge pages was
performed. A local, unprivileged user could use this flaw to cause a
denial of service or, potentially, escalate their privileges.
(CVE-2012-2133, Moderate)

* A use-after-free flaw was found in the madvise() system call
implementation in the Linux kernel. A local, unprivileged user could
use this flaw to cause a denial of service or, potentially, escalate
their privileges. (CVE-2012-3511, Moderate)

* A divide-by-zero flaw was found in the TCP Illinois congestion
control algorithm implementation in the Linux kernel. If the TCP
Illinois congestion control algorithm were in use (the sysctl
net.ipv4.tcp_congestion_control variable set to 'illinois'), a local,
unprivileged user could trigger this flaw and cause a denial of
service. (CVE-2012-4565, Moderate)

* An information leak flaw was found in the uname() system call
implementation in the Linux kernel. A local, unprivileged user could
use this flaw to leak kernel stack memory to user-space by setting the
UNAME26 personality and then calling the uname() system call.
(CVE-2012-0957, Low)

* Buffer overflow flaws were found in the udf_load_logicalvol()
function in the Universal Disk Format (UDF) file system implementation
in the Linux kernel. An attacker with physical access to a system
could use these flaws to cause a denial of service or escalate their
privileges. (CVE-2012-3400, Low)

* A flaw was found in the way the msg_namelen variable in the
rds_recvmsg() function of the Linux kernel's Reliable Datagram Sockets
(RDS) protocol implementation was initialized. A local, unprivileged
user could use this flaw to leak kernel stack memory to user-space.
(CVE-2012-3430, Low)

Red Hat would like to thank Pablo Neira Ayuso for reporting
CVE-2012-3520; Theodore Ts'o for reporting CVE-2012-4508; Shachar
Raindel for reporting CVE-2012-2133; and Kees Cook for reporting
CVE-2012-0957. Upstream acknowledges Dmitry Monakhov as the original
reporter of CVE-2012-4508. The CVE-2012-4565 issue was discovered by
Rodrigo Freire of Red Hat, and the CVE-2012-3430 issue was discovered
by the Red Hat InfiniBand team.

This update also fixes multiple bugs. Documentation for these changes
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 kernel-rt-3.2.33-rt50, and correct these
issues. The system must be rebooted for this update to take effect.

See also :

https://www.redhat.com/security/data/cve/CVE-2012-0957.html
https://www.redhat.com/security/data/cve/CVE-2012-2133.html
https://www.redhat.com/security/data/cve/CVE-2012-3400.html
https://www.redhat.com/security/data/cve/CVE-2012-3430.html
https://www.redhat.com/security/data/cve/CVE-2012-3511.html
https://www.redhat.com/security/data/cve/CVE-2012-3520.html
https://www.redhat.com/security/data/cve/CVE-2012-4508.html
https://www.redhat.com/security/data/cve/CVE-2012-4565.html
http://www.nessus.org/u?385bfeb4
http://rhn.redhat.com/errata/RHSA-2012-1491.html
http://www.nessus.org/u?b2da6e03

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 7.6
(CVSS2#AV:N/AC:H/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 6.6
(CVSS2#E:ND/RL:OF/RC:C)
Public Exploit Available : false

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