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[Bug 1450667] [NEW] timezone not cleared despite "env_keep -= TZ" in /etc/sudoers

To: touch-packages@xxxxxxxxxxxxxxxxxxx
From: andrew bezella <abezella@xxxxxxxxxxx>
Date: Thu, 30 Apr 2015 23:14:46 -0000
Reply-to: Bug 1450667 <1450667@xxxxxxxxxxxxxxxxxx>
Sender: bounces@xxxxxxxxxxxxx
Public bug reported:

the sanity check of the TZ env variable implemented in
1.8.9p5-1ubuntu1.1 to address CVE-2014-9680 apparently has the side
effect of carrying forward the TZ variable despite explicit removal in
/etc/sudoers. 1.8.9p5-1ubuntu1 does not exhibit this behavior.

% fgrep env_ /etc/sudoers
Defaults env_reset
Defaults env_keep+="JAVA_HOME"
Defaults env_keep+="SSH_AUTH_SOCK"
Defaults env_keep-="TZ"

with 1.8.9p5-1ubuntu1:
% sudo sudo -V
Sudo version 1.8.9p5
Configure options: --prefix=/usr -v --with-all-insults --with-pam --with-fqdn --with-logging=syslog --with-logfac=authpriv --with-env-editor --with-editor=/usr/bin/editor --with-timeout=15 --with-password-timeout=0 --with-passprompt=[sudo] password for %p:  --without-lecture --with-tty-tickets --disable-root-mailer --enable-admin-flag --with-sendmail=/usr/sbin/sendmail --with-timedir=/var/lib/sudo --mandir=/usr/share/man --libexecdir=/usr/lib/sudo --with-sssd --with-sssd-lib=/usr/lib/x86_64-linux-gnu --with-selinux
Sudoers policy plugin version 1.8.9p5
Sudoers file grammar version 43

Sudoers path: /etc/sudoers
Authentication methods: 'pam'
Syslog facility if syslog is being used for logging: authpriv
Syslog priority to use when user authenticates successfully: notice
Syslog priority to use when user authenticates unsuccessfully: alert
Send mail if the user is not in sudoers
Lecture user the first time they run sudo
Require users to authenticate by default
Root may run sudo
Always set $HOME to the target user's home directory
Allow some information gathering to give useful error messages
Require fully-qualified hostnames in the sudoers file
Visudo will honor the EDITOR environment variable
Set the LOGNAME and USER environment variables
Length at which to wrap log file lines (0 for no wrap): 80
Authentication timestamp timeout: 60.0 minutes
Password prompt timeout: 0.0 minutes
Number of tries to enter a password: 3
Umask to use or 0777 to use user's: 022
Path to mail program: /usr/sbin/sendmail
Flags for mail program: -t
Address to send mail to: root
Subject line for mail messages: *** SECURITY information for %h ***
Incorrect password message: Sorry, try again.
Path to authentication timestamp dir: /var/lib/sudo
Default password prompt: [sudo] password for %p: 
Default user to run commands as: root
Path to the editor for use by visudo: /usr/bin/editor
When to require a password for 'list' pseudocommand: any
When to require a password for 'verify' pseudocommand: all
File descriptors >= 3 will be closed before executing a command
Reset the environment to a default set of variables
Environment variables to check for sanity:
	TERM
	LINGUAS
	LC_*
	LANGUAGE
	LANG
	COLORTERM
Environment variables to remove:
	RUBYOPT
	RUBYLIB
	PYTHONUSERBASE
	PYTHONINSPECT
	PYTHONPATH
	PYTHONHOME
	TMPPREFIX
	ZDOTDIR
	READNULLCMD
	NULLCMD
	FPATH
	PERL5DB
	PERL5OPT
	PERL5LIB
	PERLLIB
	PERLIO_DEBUG 
	JAVA_TOOL_OPTIONS
	SHELLOPTS
	GLOBIGNORE
	PS4
	BASH_ENV
	ENV
	TERMCAP
	TERMPATH
	TERMINFO_DIRS
	TERMINFO
	_RLD*
	LD_*
	PATH_LOCALE
	NLSPATH
	HOSTALIASES
	RES_OPTIONS
	LOCALDOMAIN
	CDPATH
	IFS
Environment variables to preserve:
	SSH_AUTH_SOCK
	JAVA_HOME
	XAUTHORIZATION
	XAUTHORITY
	PS2
	PS1
	PATH
	LS_COLORS
	KRB5CCNAME
	HOSTNAME
	HOME
	DISPLAY
	COLORS
Locale to use while parsing sudoers: C
Directory in which to store input/output logs: /var/log/sudo-io
File in which to store the input/output log: %{seq}
Add an entry to the utmp/utmpx file when allocating a pty
PAM service name to use
PAM service name to use for login shells
Create a new PAM session for the command to run in
Maximum I/O log sequence number: 0

Local IP address and netmask pairs:
	207.241.227.232/255.255.248.0
	fe80::225:90ff:fee4:aef0/ffff:ffff:ffff:ffff::
	fe80::225:90ff:fee4:aef0/ffff:ffff:ffff:ffff::

Sudoers I/O plugin version 1.8.9p5

% sudo env | g TZ
[no output]

with sudo 1.8.9p5-1ubuntu1.1:
% sudo sudo -V
Sudo version 1.8.9p5
Configure options: --prefix=/usr -v --with-all-insults --with-pam --with-fqdn --with-logging=syslog --with-logfac=authpriv --with-env-editor --with-editor=/usr/bin/editor --with-timeout=15 --with-password-timeout=0 --with-passprompt=[sudo] password for %p:  --without-lecture --with-tty-tickets --disable-root-mailer --enable-admin-flag --with-sendmail=/usr/sbin/sendmail --with-timedir=/var/lib/sudo --mandir=/usr/share/man --libexecdir=/usr/lib/sudo --with-sssd --with-sssd-lib=/usr/lib/x86_64-linux-gnu --with-selinux
Sudoers policy plugin version 1.8.9p5
Sudoers file grammar version 43

Sudoers path: /etc/sudoers
Authentication methods: 'pam'
Syslog facility if syslog is being used for logging: authpriv
Syslog priority to use when user authenticates successfully: notice
Syslog priority to use when user authenticates unsuccessfully: alert
Send mail if the user is not in sudoers
Lecture user the first time they run sudo
Require users to authenticate by default
Root may run sudo
Always set $HOME to the target user's home directory
Allow some information gathering to give useful error messages
Require fully-qualified hostnames in the sudoers file
Visudo will honor the EDITOR environment variable
Set the LOGNAME and USER environment variables
Length at which to wrap log file lines (0 for no wrap): 80
Authentication timestamp timeout: 60.0 minutes
Password prompt timeout: 0.0 minutes
Number of tries to enter a password: 3
Umask to use or 0777 to use user's: 022
Path to mail program: /usr/sbin/sendmail
Flags for mail program: -t
Address to send mail to: root
Subject line for mail messages: *** SECURITY information for %h ***
Incorrect password message: Sorry, try again.
Path to authentication timestamp dir: /var/lib/sudo
Default password prompt: [sudo] password for %p: 
Default user to run commands as: root
Path to the editor for use by visudo: /usr/bin/editor
When to require a password for 'list' pseudocommand: any
When to require a password for 'verify' pseudocommand: all
File descriptors >= 3 will be closed before executing a command
Reset the environment to a default set of variables
Environment variables to check for sanity:
	TZ
	TERM
	LINGUAS
	LC_*
	LANGUAGE
	LANG
	COLORTERM
Environment variables to remove:
	RUBYOPT
	RUBYLIB
	PYTHONUSERBASE
	PYTHONINSPECT
	PYTHONPATH
	PYTHONHOME
	TMPPREFIX
	ZDOTDIR
	READNULLCMD
	NULLCMD
	FPATH
	PERL5DB
	PERL5OPT
	PERL5LIB
	PERLLIB
	PERLIO_DEBUG 
	JAVA_TOOL_OPTIONS
	SHELLOPTS
	GLOBIGNORE
	PS4
	BASH_ENV
	ENV
	TERMCAP
	TERMPATH
	TERMINFO_DIRS
	TERMINFO
	_RLD*
	LD_*
	PATH_LOCALE
	NLSPATH
	HOSTALIASES
	RES_OPTIONS
	LOCALDOMAIN
	CDPATH
	IFS
Environment variables to preserve:
	SSH_AUTH_SOCK
	JAVA_HOME
	XAUTHORIZATION
	XAUTHORITY
	PS2
	PS1
	PATH
	LS_COLORS
	KRB5CCNAME
	HOSTNAME
	HOME
	DISPLAY
	COLORS
Locale to use while parsing sudoers: C
Directory in which to store input/output logs: /var/log/sudo-io
File in which to store the input/output log: %{seq}
Add an entry to the utmp/utmpx file when allocating a pty
PAM service name to use
PAM service name to use for login shells
Create a new PAM session for the command to run in
Maximum I/O log sequence number: 0

Local IP address and netmask pairs:
	207.241.227.232/255.255.248.0
	fe80::225:90ff:fee4:aef0/ffff:ffff:ffff:ffff::
	fe80::225:90ff:fee4:aef0/ffff:ffff:ffff:ffff::

Sudoers I/O plugin version 1.8.9p5

% sudo env | g TZ
TZ=America/Los_Angeles

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: sudo 1.8.9p5-1ubuntu1.1
ProcVersionSignature: Ubuntu 3.13.0-49.83-generic 3.13.11-ckt17
Uname: Linux 3.13.0-49-generic x86_64
ApportVersion: 2.14.1-0ubuntu3.10
Architecture: amd64
Date: Thu Apr 30 15:53:59 2015
ProcEnviron:
 TERM=rxvt-unicode-256color
 PATH=(custom, no user)
 LANG=en_US.UTF-8
 SHELL=/usr/bin/zsh
SourcePackage: sudo
UpgradeStatus: No upgrade log present (probably fresh install)
modified.conffile..etc.sudoers: [modified]
mtime.conffile..etc.sudoers: 2015-04-30T15:26:42.293612

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


** Tags: amd64 apport-bug trusty

-- 
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https://bugs.launchpad.net/bugs/1450667

Title:
  timezone not cleared despite "env_keep -= TZ" in /etc/sudoers

Status in sudo package in Ubuntu:
  New

Bug description:
  the sanity check of the TZ env variable implemented in
  1.8.9p5-1ubuntu1.1 to address CVE-2014-9680 apparently has the side
  effect of carrying forward the TZ variable despite explicit removal in
  /etc/sudoers. 1.8.9p5-1ubuntu1 does not exhibit this behavior.

  % fgrep env_ /etc/sudoers
  Defaults env_reset
  Defaults env_keep+="JAVA_HOME"
  Defaults env_keep+="SSH_AUTH_SOCK"
  Defaults env_keep-="TZ"

  with 1.8.9p5-1ubuntu1:
  % sudo sudo -V
  Sudo version 1.8.9p5
  Configure options: --prefix=/usr -v --with-all-insults --with-pam --with-fqdn --with-logging=syslog --with-logfac=authpriv --with-env-editor --with-editor=/usr/bin/editor --with-timeout=15 --with-password-timeout=0 --with-passprompt=[sudo] password for %p:  --without-lecture --with-tty-tickets --disable-root-mailer --enable-admin-flag --with-sendmail=/usr/sbin/sendmail --with-timedir=/var/lib/sudo --mandir=/usr/share/man --libexecdir=/usr/lib/sudo --with-sssd --with-sssd-lib=/usr/lib/x86_64-linux-gnu --with-selinux
  Sudoers policy plugin version 1.8.9p5
  Sudoers file grammar version 43

  Sudoers path: /etc/sudoers
  Authentication methods: 'pam'
  Syslog facility if syslog is being used for logging: authpriv
  Syslog priority to use when user authenticates successfully: notice
  Syslog priority to use when user authenticates unsuccessfully: alert
  Send mail if the user is not in sudoers
  Lecture user the first time they run sudo
  Require users to authenticate by default
  Root may run sudo
  Always set $HOME to the target user's home directory
  Allow some information gathering to give useful error messages
  Require fully-qualified hostnames in the sudoers file
  Visudo will honor the EDITOR environment variable
  Set the LOGNAME and USER environment variables
  Length at which to wrap log file lines (0 for no wrap): 80
  Authentication timestamp timeout: 60.0 minutes
  Password prompt timeout: 0.0 minutes
  Number of tries to enter a password: 3
  Umask to use or 0777 to use user's: 022
  Path to mail program: /usr/sbin/sendmail
  Flags for mail program: -t
  Address to send mail to: root
  Subject line for mail messages: *** SECURITY information for %h ***
  Incorrect password message: Sorry, try again.
  Path to authentication timestamp dir: /var/lib/sudo
  Default password prompt: [sudo] password for %p: 
  Default user to run commands as: root
  Path to the editor for use by visudo: /usr/bin/editor
  When to require a password for 'list' pseudocommand: any
  When to require a password for 'verify' pseudocommand: all
  File descriptors >= 3 will be closed before executing a command
  Reset the environment to a default set of variables
  Environment variables to check for sanity:
  	TERM
  	LINGUAS
  	LC_*
  	LANGUAGE
  	LANG
  	COLORTERM
  Environment variables to remove:
  	RUBYOPT
  	RUBYLIB
  	PYTHONUSERBASE
  	PYTHONINSPECT
  	PYTHONPATH
  	PYTHONHOME
  	TMPPREFIX
  	ZDOTDIR
  	READNULLCMD
  	NULLCMD
  	FPATH
  	PERL5DB
  	PERL5OPT
  	PERL5LIB
  	PERLLIB
  	PERLIO_DEBUG 
  	JAVA_TOOL_OPTIONS
  	SHELLOPTS
  	GLOBIGNORE
  	PS4
  	BASH_ENV
  	ENV
  	TERMCAP
  	TERMPATH
  	TERMINFO_DIRS
  	TERMINFO
  	_RLD*
  	LD_*
  	PATH_LOCALE
  	NLSPATH
  	HOSTALIASES
  	RES_OPTIONS
  	LOCALDOMAIN
  	CDPATH
  	IFS
  Environment variables to preserve:
  	SSH_AUTH_SOCK
  	JAVA_HOME
  	XAUTHORIZATION
  	XAUTHORITY
  	PS2
  	PS1
  	PATH
  	LS_COLORS
  	KRB5CCNAME
  	HOSTNAME
  	HOME
  	DISPLAY
  	COLORS
  Locale to use while parsing sudoers: C
  Directory in which to store input/output logs: /var/log/sudo-io
  File in which to store the input/output log: %{seq}
  Add an entry to the utmp/utmpx file when allocating a pty
  PAM service name to use
  PAM service name to use for login shells
  Create a new PAM session for the command to run in
  Maximum I/O log sequence number: 0

  Local IP address and netmask pairs:
  	207.241.227.232/255.255.248.0
  	fe80::225:90ff:fee4:aef0/ffff:ffff:ffff:ffff::
  	fe80::225:90ff:fee4:aef0/ffff:ffff:ffff:ffff::

  Sudoers I/O plugin version 1.8.9p5

  % sudo env | g TZ
  [no output]

  with sudo 1.8.9p5-1ubuntu1.1:
  % sudo sudo -V
  Sudo version 1.8.9p5
  Configure options: --prefix=/usr -v --with-all-insults --with-pam --with-fqdn --with-logging=syslog --with-logfac=authpriv --with-env-editor --with-editor=/usr/bin/editor --with-timeout=15 --with-password-timeout=0 --with-passprompt=[sudo] password for %p:  --without-lecture --with-tty-tickets --disable-root-mailer --enable-admin-flag --with-sendmail=/usr/sbin/sendmail --with-timedir=/var/lib/sudo --mandir=/usr/share/man --libexecdir=/usr/lib/sudo --with-sssd --with-sssd-lib=/usr/lib/x86_64-linux-gnu --with-selinux
  Sudoers policy plugin version 1.8.9p5
  Sudoers file grammar version 43

  Sudoers path: /etc/sudoers
  Authentication methods: 'pam'
  Syslog facility if syslog is being used for logging: authpriv
  Syslog priority to use when user authenticates successfully: notice
  Syslog priority to use when user authenticates unsuccessfully: alert
  Send mail if the user is not in sudoers
  Lecture user the first time they run sudo
  Require users to authenticate by default
  Root may run sudo
  Always set $HOME to the target user's home directory
  Allow some information gathering to give useful error messages
  Require fully-qualified hostnames in the sudoers file
  Visudo will honor the EDITOR environment variable
  Set the LOGNAME and USER environment variables
  Length at which to wrap log file lines (0 for no wrap): 80
  Authentication timestamp timeout: 60.0 minutes
  Password prompt timeout: 0.0 minutes
  Number of tries to enter a password: 3
  Umask to use or 0777 to use user's: 022
  Path to mail program: /usr/sbin/sendmail
  Flags for mail program: -t
  Address to send mail to: root
  Subject line for mail messages: *** SECURITY information for %h ***
  Incorrect password message: Sorry, try again.
  Path to authentication timestamp dir: /var/lib/sudo
  Default password prompt: [sudo] password for %p: 
  Default user to run commands as: root
  Path to the editor for use by visudo: /usr/bin/editor
  When to require a password for 'list' pseudocommand: any
  When to require a password for 'verify' pseudocommand: all
  File descriptors >= 3 will be closed before executing a command
  Reset the environment to a default set of variables
  Environment variables to check for sanity:
  	TZ
  	TERM
  	LINGUAS
  	LC_*
  	LANGUAGE
  	LANG
  	COLORTERM
  Environment variables to remove:
  	RUBYOPT
  	RUBYLIB
  	PYTHONUSERBASE
  	PYTHONINSPECT
  	PYTHONPATH
  	PYTHONHOME
  	TMPPREFIX
  	ZDOTDIR
  	READNULLCMD
  	NULLCMD
  	FPATH
  	PERL5DB
  	PERL5OPT
  	PERL5LIB
  	PERLLIB
  	PERLIO_DEBUG 
  	JAVA_TOOL_OPTIONS
  	SHELLOPTS
  	GLOBIGNORE
  	PS4
  	BASH_ENV
  	ENV
  	TERMCAP
  	TERMPATH
  	TERMINFO_DIRS
  	TERMINFO
  	_RLD*
  	LD_*
  	PATH_LOCALE
  	NLSPATH
  	HOSTALIASES
  	RES_OPTIONS
  	LOCALDOMAIN
  	CDPATH
  	IFS
  Environment variables to preserve:
  	SSH_AUTH_SOCK
  	JAVA_HOME
  	XAUTHORIZATION
  	XAUTHORITY
  	PS2
  	PS1
  	PATH
  	LS_COLORS
  	KRB5CCNAME
  	HOSTNAME
  	HOME
  	DISPLAY
  	COLORS
  Locale to use while parsing sudoers: C
  Directory in which to store input/output logs: /var/log/sudo-io
  File in which to store the input/output log: %{seq}
  Add an entry to the utmp/utmpx file when allocating a pty
  PAM service name to use
  PAM service name to use for login shells
  Create a new PAM session for the command to run in
  Maximum I/O log sequence number: 0

  Local IP address and netmask pairs:
  	207.241.227.232/255.255.248.0
  	fe80::225:90ff:fee4:aef0/ffff:ffff:ffff:ffff::
  	fe80::225:90ff:fee4:aef0/ffff:ffff:ffff:ffff::

  Sudoers I/O plugin version 1.8.9p5

  % sudo env | g TZ
  TZ=America/Los_Angeles

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: sudo 1.8.9p5-1ubuntu1.1
  ProcVersionSignature: Ubuntu 3.13.0-49.83-generic 3.13.11-ckt17
  Uname: Linux 3.13.0-49-generic x86_64
  ApportVersion: 2.14.1-0ubuntu3.10
  Architecture: amd64
  Date: Thu Apr 30 15:53:59 2015
  ProcEnviron:
   TERM=rxvt-unicode-256color
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/usr/bin/zsh
  SourcePackage: sudo
  UpgradeStatus: No upgrade log present (probably fresh install)
  modified.conffile..etc.sudoers: [modified]
  mtime.conffile..etc.sudoers: 2015-04-30T15:26:42.293612

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Follow ups

[Bug 1450667] Re: timezone not cleared despite "env_keep -= TZ" in /etc/sudoers
From: Marc Deslauriers, 2015-05-01
[Bug 1450667] Re: timezone not cleared despite "env_keep -= TZ" in /etc/sudoers
From: andrew bezella, 2015-04-30
[Bug 1450667] [NEW] timezone not cleared despite "env_keep -= TZ" in /etc/sudoers
From: andrew bezella, 2015-04-30
References

[Bug 1450667] [NEW] timezone not cleared despite "env_keep -= TZ" in /etc/sudoers
From: andrew bezella, 2015-04-30