All local interactive user initialization files executable search paths must contain only paths that resolve to the system default or the users home directory.

Overview

Finding ID	Version	Rule ID	IA Controls	Severity
V-75571	UBTU-16-010780	SV-90251r1_rule		Medium

Description
The executable search path (typically the PATH environment variable) contains a list of directories for the shell to search to find executables. If this path includes the current working directory executables in these directories may be executed instead of system commands. This variable is formatted as a colon-separated list of directories. If there is an empty entry, such as a leading or trailing colon or two consecutive colons, this is interpreted as the current working directory. If deviations from the default system search path for the local interactive user are required, they must be documented with the Information System Security Officer (ISSO).

Description

The executable search path (typically the PATH environment variable) contains a list of directories for the shell to search to find executables. If this path includes the current working directory executables in these directories may be executed instead of system commands. This variable is formatted as a colon-separated list of directories. If there is an empty entry, such as a leading or trailing colon or two consecutive colons, this is interpreted as the current working directory. If deviations from the default system search path for the local interactive user are required, they must be documented with the Information System Security Officer (ISSO).

STIG	Date
Canonical Ubuntu 16.04 Security Technical Implementation Guide	2020-05-29

Details

Check Text ( C-75275r1_chk )
Verify that all local interactive user initialization files' executable search path statements do not contain statements that will reference a working directory other than the users’ home directory or the system default. Check the executable search path statement for all local interactive user initialization files in the users' home directory with the following commands: Note: The example will be for the smithj user, which has a home directory of "/home/smithj". # grep -i path /home/smithj/.* /home/smithj/.bash_profile:PATH=$PATH:$HOME/.local/bin:$HOME/bin /home/smithj/.bash_profile:export PATH If any local interactive user initialization files have executable search path statements that include directories outside of their home directory, and the additional path statements are not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.

Check Text ( C-75275r1_chk )

Verify that all local interactive user initialization files' executable search path statements do not contain statements that will reference a working directory other than the users’ home directory or the system default.

Check the executable search path statement for all local interactive user initialization files in the users' home directory with the following commands:

Note: The example will be for the smithj user, which has a home directory of "/home/smithj".

# grep -i path /home/smithj/.*
/home/smithj/.bash_profile:PATH=$PATH:$HOME/.local/bin:$HOME/bin
/home/smithj/.bash_profile:export PATH

If any local interactive user initialization files have executable search path statements that include directories outside of their home directory, and the additional path statements are not documented with the Information System Security Officer (ISSO) as an operational requirement, this is a finding.

Fix Text (F-82199r1_fix)
Edit the local interactive user initialization files to change any PATH variable statements for executables that reference directories other than their home directory or the system default. If a local interactive user requires path variables to reference a directory owned by the application, it must be documented with the Information System Security Officer (ISSO).