Ubuntu 14.04 LTS : linux-lts-vivid vulnerabilities (USN-2690-1)

Ubuntu Security Notice (C) 2015-2016 Canonical, Inc. / NASL script (C) 2015-2016 Tenable Network Security, Inc.


Synopsis :

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

Description :

Andy Lutomirski discovered a flaw in the Linux kernel's handling of
nested NMIs (non-maskable interrupts). An unprivileged local user
could exploit this flaw to cause a denial of service (system crash) or
potentially escalate their privileges. (CVE-2015-3290)

Colin King discovered a flaw in the add_key function of the Linux
kernel's keyring subsystem. A local user could exploit this flaw to
cause a denial of service (memory exhaustion). (CVE-2015-1333)

Andy Lutomirski discovered a flaw that allows user to cause the Linux
kernel to ignore some NMIs (non-maskable interrupts). A local
unprivileged user could exploit this flaw to potentially cause the
system to miss important NMIs resulting in unspecified effects.
(CVE-2015-3291)

Andy Lutomirski and Petr Matousek discovered that an NMI (non-maskable
interrupt) that interrupts userspace and encounters an IRET fault is
incorrectly handled by the Linux kernel. An unprivileged local user
could exploit this flaw to cause a denial of service (kernel OOPs),
corruption, or potentially escalate privileges on the system.
(CVE-2015-5157).

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-3.19-generic,
linux-image-3.19-generic-lpae and / or linux-image-3.19-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: 85078 ()

Bugtraq ID:

CVE ID: CVE-2015-1333
CVE-2015-3290
CVE-2015-3291
CVE-2015-5157

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