Scientific Linux Security Update : kernel on SL7.x x86_64

This script is Copyright (C) 2015-2016 Tenable Network Security, Inc.


Synopsis :

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

Description :

* A flaw was found in the way the Linux kernel's file system
implementation handled rename operations in which the source was
inside and the destination was outside of a bind mount. A privileged
user inside a container could use this flaw to escape the bind mount
and, potentially, escalate their privileges on the system.
(CVE-2015-2925, Important)

* A race condition flaw was found in the way the Linux kernel's IPC
subsystem initialized certain fields in an IPC object structure that
were later used for permission checking before inserting the object
into a globally visible list. A local, unprivileged user could
potentially use this flaw to elevate their privileges on the system.
(CVE-2015-7613, Important)

* It was found that reporting emulation failures to user space could
lead to either a local (CVE-2014-7842) or a L2->L1 (CVE-2010-5313)
denial of service. In the case of a local denial of service, an
attacker must have access to the MMIO area or be able to access an I/O
port. (CVE-2010-5313, CVE-2014-7842, Moderate)

* A flaw was found in the way the Linux kernel's KVM subsystem handled
non-canonical addresses when emulating instructions that change the
RIP (for example, branches or calls). A guest user with access to an
I/O or MMIO region could use this flaw to crash the guest.
(CVE-2014-3647, Moderate)

* It was found that the Linux kernel memory resource controller's
(memcg) handling of OOM (out of memory) conditions could lead to
deadlocks. An attacker could use this flaw to lock up the system.
(CVE-2014-8171, Moderate)

* A race condition flaw was found between the chown and execve system
calls. A local, unprivileged user could potentially use this flaw to
escalate their privileges on the system. (CVE-2015-3339, Moderate)

* A flaw was discovered in the way the Linux kernel's TTY subsystem
handled the tty shutdown phase. A local, unprivileged user could use
this flaw to cause a denial of service on the system. (CVE-2015-4170,
Moderate)

* A NULL pointer dereference flaw was found in the SCTP
implementation. A local user could use this flaw to cause a denial of
service on the system by triggering a kernel panic when creating
multiple sockets in parallel while the system did not have the SCTP
module loaded. (CVE-2015-5283, Moderate)

* A flaw was found in the way the Linux kernel's perf subsystem
retrieved userlevel stack traces on PowerPC systems. A local,
unprivileged user could use this flaw to cause a denial of service on
the system. (CVE-2015-6526, Moderate)

* A flaw was found in the way the Linux kernel's Crypto subsystem
handled automatic loading of kernel modules. A local user could use
this flaw to load any installed kernel module, and thus increase the
attack surface of the running kernel. (CVE-2013-7421, CVE-2014-9644,
Low)

* An information leak flaw was found in the way the Linux kernel
changed certain segment registers and thread-local storage (TLS)
during a context switch. A local, unprivileged user could use this
flaw to leak the user space TLS base address of an arbitrary process.
(CVE-2014-9419, Low)

* It was found that the Linux kernel KVM subsystem's sysenter
instruction emulation was not sufficient. An unprivileged guest user
could use this flaw to escalate their privileges by tricking the
hypervisor to emulate a SYSENTER instruction in 16-bit mode, if the
guest OS did not initialize the SYSENTER model-specific registers
(MSRs). Note: Certified guest operating systems for Scientific Linux
with KVM do initialize the SYSENTER MSRs and are thus not vulnerable
to this issue when running on a KVM hypervisor. (CVE-2015-0239, Low)

* A flaw was found in the way the Linux kernel handled the securelevel
functionality after performing a kexec operation. A local attacker
could use this flaw to bypass the security mechanism of the
securelevel/secureboot combination. (CVE-2015-7837, Low)

See also :

http://www.nessus.org/u?5d404a7e

Solution :

Update the affected packages.

Risk factor :

Medium / CVSS Base Score : 6.9
(CVSS2#AV:L/AC:M/Au:N/C:C/I:C/A:C)

Ready to Amp Up Your Nessus Experience?

Get Nessus Professional to scan unlimited IPs, run compliance checks & more

Buy Nessus Professional Now