Scientific Linux Security Update : kernel on SL5.x i386/x86_64

This script is Copyright (C) 2012-2014 Tenable Network Security, Inc.


Synopsis :

The remote Scientific Linux host is missing one or more security
updates.

Description :

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

This update fixes the following security issues :

- A NULL pointer dereference flaw was found in the Linux
kernel's Stream Control Transmission Protocol (SCTP)
implementation. A remote attacker could send a specially
crafted SCTP packet to a target system, resulting in a
denial of service. (CVE-2011-2482, Important)

- A flaw in the Linux kernel's client-side NFS Lock
Manager (NLM) implementation could allow a local,
unprivileged user to cause a denial of service.
(CVE-2011-2491, Important)

- Buffer overflow flaws in the Linux kernel's
netlink-based wireless configuration interface
implementation could allow a local user, who has the
CAP_NET_ADMIN capability, to cause a denial of service
or escalate their privileges on systems that have an
active wireless interface. (CVE-2011-2517, Important)

- A flaw was found in the way the Linux kernel's Xen
hypervisor implementation emulated the SAHF instruction.
When using a fully-virtualized guest on a host that does
not use hardware assisted paging (HAP), such as those
running CPUs that do not have support for (or those that
have it disabled) Intel Extended Page Tables (EPT) or
AMD Virtualization (AMD-V) Rapid Virtualization Indexing
(RVI), a privileged guest user could trigger this flaw
to cause the hypervisor to crash. (CVE-2011-2519,
Moderate)

- An off-by-one flaw was found in the __addr_ok() macro in
the Linux kernel's Xen hypervisor implementation when
running on 64-bit systems. A privileged guest user could
trigger this flaw to cause the hypervisor to crash.
(CVE-2011-2901, Moderate)

- /proc/[PID]/io is world-readable by default. Previously,
these files could be read without any further
restrictions. A local, unprivileged user could read
these files, belonging to other, possibly privileged
processes to gather confidential information, such as
the length of a password used in a process.
(CVE-2011-2495, Low)

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, and fix the bugs noted in
the Technical Notes. The system must be rebooted for this update to
take effect.

See also :

http://www.nessus.org/u?b2308247

Solution :

Update the affected packages.

Risk factor :

High / CVSS Base Score : 7.8
(CVSS2#AV:N/AC:L/Au:N/C:N/I:N/A:C)

Family: Scientific Linux Local Security Checks

Nessus Plugin ID: 61132 ()

Bugtraq ID:

CVE ID: CVE-2011-2482
CVE-2011-2491
CVE-2011-2495
CVE-2011-2517
CVE-2011-2519
CVE-2011-2901