Ubuntu 14.04 LTS : linux-lts-wily regression (USN-2908-5)

Ubuntu Security Notice (C) 2016 Canonical, Inc. / NASL script (C) 2016 Tenable Network Security, Inc.


Synopsis :

The remote Ubuntu host is missing one or more security-related
patches.

Description :

USN-2908-2 fixed vulnerabilities in the Ubuntu 15.10 Linux kernel
backported to Ubuntu 14.04 LTS. An incorrect locking fix caused a
regression that broke graphics displays for Ubuntu 14.04 LTS guests
running the Ubuntu 15.10 backport kernel within VMware virtual
machines. This update fixes the problem.

We apologize for the inconvenience.

halfdog discovered that OverlayFS, when mounting on top of a FUSE
mount, incorrectly propagated file attributes, including setuid. A
local unprivileged attacker could use this to gain privileges.
(CVE-2016-1576)

halfdog discovered that OverlayFS in the Linux kernel
incorrectly propagated security sensitive extended
attributes, such as POSIX ACLs. A local unprivileged
attacker could use this to gain privileges. (CVE-2016-1575)

It was discovered that the Linux kernel did not properly
enforce rlimits for file descriptors sent over UNIX domain
sockets. A local attacker could use this to cause a denial
of service. (CVE-2013-4312)

It was discovered that the Linux kernel's Filesystem in
Userspace (FUSE) implementation did not handle initial zero
length segments properly. A local attacker could use this to
cause a denial of service (unkillable task). (CVE-2015-8785)

Andy Lutomirski discovered a race condition in the Linux
kernel's translation lookaside buffer (TLB) handling of
flush events. A local attacker could use this to cause a
denial of service or possibly leak sensitive information.
(CVE-2016-2069).

Note that Tenable Network Security has extracted the preceding
description block directly from the Ubuntu security advisory. Tenable
has attempted to automatically clean and format it as much as possible
without introducing additional issues.

Solution :

Update the affected linux-image-4.2-generic,
linux-image-4.2-generic-lpae and / or linux-image-4.2-lowlatency
packages.

Risk factor :

High / CVSS Base Score : 7.2
(CVSS2#AV:L/AC:L/Au:N/C:C/I:C/A:C)
CVSS Temporal Score : 6.0
(CVSS2#E:F/RL:OF/RC:ND)
Public Exploit Available : true

Family: Ubuntu Local Security Checks

Nessus Plugin ID: 89024 ()

Bugtraq ID:

CVE ID: CVE-2013-4312
CVE-2015-8785
CVE-2016-1575
CVE-2016-1576
CVE-2016-2069

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