Ubuntu Security Notice (C) 2005-2016 Canonical, Inc. / NASL script (C) 2006-2016 Tenable Network Security, Inc.
The remote Ubuntu host is missing one or more security-related
Michael Kerrisk noticed an insufficient permission checking in the
shmctl() function. Any process was permitted to lock/unlock any System
V shared memory segment that fell within the the RLIMIT_MEMLOCK limit
(that is the maximum size of shared memory that unprivileged users can
acquire). This allowed am unprivileged user process to unlock locked
memory of other processes, thereby allowing them to be swapped out.
Usually locked shared memory is used to store passphrases and other
sensitive content which must not be written to the swap space (where
it could be read out even after a reboot).
OGAWA Hirofumi noticed that the table sizes in nls_ascii.c were
incorrectly set to 128 instead of 256. This caused a buffer overflow
in some cases which could be exploited to crash the kernel.
A race condition was found in the terminal handling of the 'setsid()'
function, which is used to start new process sessions.
David Coulson noticed a design flaw in the netfilter/iptables module.
By sending specially crafted packets, a remote attacker could exploit
this to crash the kernel or to bypass firewall rules.
Fixing this vulnerability required a change in the
Application Binary Interface (ABI) of the kernel. This means
that third-party user installed modules might not work any
more with the new kernel, so this fixed kernel has a new ABI
version number. You have to recompile and reinstall all
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.
Update the affected packages.
Risk factor :
High / CVSS Base Score : 7.8