[Bug 1751129] [NEW] I think there is some security issue in my ubuntu .

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If I log into any other user i am able to access my main user  through
terminal with my current user password. I am using ubuntu 16.04 and I
think it might be in all ubuntu 16.04 operating systems.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: unity 7.4.5+16.04.20171201.3
Uname: Linux 4.15.1-041501-generic x86_64
.tmp.unity_support_test.0:
 
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,staticswitcher,workarounds,scale,expo,ezoom,dbus]
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
CurrentDesktop: Unity
Date: Fri Feb 23 01:06:34 2018
DistUpgraded: Fresh install
DistroCodename: xenial
DistroVariant: ubuntu
DkmsStatus:
 bbswitch, 0.8, 4.13.0-32-generic, x86_64: installed
 bbswitch, 0.8, 4.15.1-041501-generic, x86_64: installed
 nvidia-384, 384.111, 4.13.0-32-generic, x86_64: installed
 nvidia-384, 384.111, 4.15.1-041501-generic, x86_64: installed
 virtualbox, 5.0.40, 4.13.0-32-generic, x86_64: installed
ExecutablePath: /usr/bin/compiz
GconfCompiz:
 /apps/compiz-1/general:
   /apps/compiz-1/general/screen0:
    /apps/compiz-1/general/screen0/options:
     active_plugins = [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,staticswitcher,workarounds,scale,expo,ezoom,dbus]
GraphicsCard:
 Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 0b) (prog-if 00 [VGA controller])
   Subsystem: Hewlett-Packard Company Haswell-ULT Integrated Graphics Controller [103c:198f]
InstallationDate: Installed on 2018-01-22 (31 days ago)
InstallationMedia: Ubuntu 16.04.3 LTS "Xenial Xerus" - Release amd64 (20170801)
MachineType: Hewlett-Packard HP EliteBook 840 G1
ProcEnviron:
 PATH=(custom, user)
 SHELL=/bin/bash
 LANG=en_IN
 LANGUAGE=en_IN:en
 XDG_RUNTIME_DIR=<set>
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.1-041501-generic root=UUID=95af4278-a5ad-4183-9691-2a68fd0e627e ro resume=UUID=a7e7e167-65b7-4b78-ad75-4400e9b38bad resume= resume= quiet splash vt.handoff=7
SourcePackage: unity
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/01/2015
dmi.bios.vendor: Hewlett-Packard
dmi.bios.version: L71 Ver. 01.33
dmi.board.name: 198F
dmi.board.vendor: Hewlett-Packard
dmi.board.version: KBC Version 15.57
dmi.chassis.asset.tag: CNU4219GQQ
dmi.chassis.type: 10
dmi.chassis.vendor: Hewlett-Packard
dmi.modalias: dmi:bvnHewlett-Packard:bvrL71Ver.01.33:bd09/01/2015:svnHewlett-Packard:pnHPEliteBook840G1:pvrA3009FD10303:rvnHewlett-Packard:rn198F:rvrKBCVersion15.57:cvnHewlett-Packard:ct10:cvr:
dmi.product.family: 103C_5336AN G=N L=BUS B=HP S=ELI
dmi.product.name: HP EliteBook 840 G1
dmi.product.version: A3009FD10303
dmi.sys.vendor: Hewlett-Packard
version.compiz: compiz 1:0.9.12.3+16.04.20171116-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.83-1~16.04.1
version.libgl1-mesa-dri: libgl1-mesa-dri 17.2.8-0ubuntu0~16.04.1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 17.2.8-0ubuntu0~16.04.1
version.xserver-xorg-core: xserver-xorg-core N/A
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
version.xserver-xorg-video-ati: xserver-xorg-video-ati N/A
version.xserver-xorg-video-intel: xserver-xorg-video-intel N/A
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau N/A
xserver.bootTime: Thu Feb 22 21:34:13 2018
xserver.configfile: default
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.19.5-0ubuntu2~16.04.1
xserver.video_driver: modeset

** Affects: sudo (Ubuntu)
     Importance: Undecided
         Status: Incomplete


** Tags: amd64 apport-bug compiz-0.9 ubuntu xenial
-- 
I think there is some security issue in my ubuntu . 
https://bugs.launchpad.net/bugs/1751129
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