[Bug 1923262] Re: backup /etc/passwd- file should be mode 0600

[pkaeding]

I agree, it was surprising to me as well. The rationale given is just
this:

```
It is critical to ensure that the /etc/passwd- file is protected from unauthorized access. Although it is protected by default, the file permissions could be changed either inadvertently or through malicious actions.
```

If you are interested, you can download the guide at
http://workbench.cisecurity.org (I don't recall the specific terms I
clicked through when I downloaded it, but I don't think I'm allowed to
post it here, even though anyone can download it directly for $0)

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https://bugs.launchpad.net/bugs/1923262

Title:
  backup /etc/passwd- file should be mode 0600

Status in shadow package in Ubuntu:
  Incomplete

Bug description:
  CIS hardening benchmarks (6.1.6) suggest that the /etc/passwd- file
  should be mode 0600 (or more restrictive).

  However, this file is 0644 after it is created when the /etc/passwd
  file is modified. (Ie, a hardening script that creates a hardened
  system for initial use could change this mode, but it will go out of
  compliance the next time a backup file is made.)

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