full-disclosure - [FD] Scope of Debian's /home/loser is with permissions 755, default umask 002

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Message-ID: <CAGUWgD8rwjqj=yoU-wnO67eYs2g-0Qze6nJcgQyMeDQmCtRYoA@mail.gmail.com>
Date: Thu, 12 Nov 2020 13:26:57 +0200
From: Georgi Guninski <gguninski@...il.com>
To: fulldisclosure@...lists.org
Subject: [FD] Scope of Debian's /home/loser is with permissions 755,
	default umask 002

On Debian /home/loser is with permissions 755, default umask 0022

(If you don't understand the numbers, this means a lot of
files are world readable).

On multiuser machines this sucks much.

Question: How much sensitive data can be read on default install?

Partial results:

1. mutt (text email client) exposes ~/.mutt/muttrc,
which might contain the imap password in plaintext.

2. Some time ago on a multiuser debian mirror we found a lot of data,
including the wordpress password of the admin.

3. Anything created by EDITOR NEWFILE is readable, unless the directory
prevents. This include root doing EDITOR /etc/NEWFILE

Debian said won't fix:
https://www.openwall.com/lists/oss-security/2020/10/07/4

Consider contracting me for gnu/linux security,
CV:  https://j.ludost.net/resumegg.pdf

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