[Bug 2076898] [NEW] Numeric name is accepted as valid username for useradd/groupadd

[Hector CAO]

Public bug reported:

Pure numeric names (example 0, 100) should be considered as invalid group and user names
The command useradd and groupadd must refuse them

This is not the case in the latest version of shadow : 1:4.15.3-3ubuntu1

When we issue:

$ useradd 0

The command succeeds instead of failing.

** Affects: shadow (Ubuntu)
     Importance: Undecided
     Assignee: Hector CAO (hectorcao)
         Status: In Progress

** Changed in: shadow (Ubuntu)
       Status: New => In Progress

** Changed in: shadow (Ubuntu)
     Assignee: (unassigned) => Hector CAO (hectorcao)

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https://bugs.launchpad.net/bugs/2076898

Title:
  Numeric name is accepted as valid username for useradd/groupadd

Status in shadow package in Ubuntu:
  In Progress

Bug description:
  Pure numeric names (example 0, 100) should be considered as invalid group and user names
  The command useradd and groupadd must refuse them

  This is not the case in the latest version of shadow :
  1:4.15.3-3ubuntu1

  When we issue:

  $ useradd 0

  The command succeeds instead of failing.

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