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Date: Fri, 3 Nov 2017 21:41:59 +0100
From: Jakub Wilk <jwilk@...lk.net>
To: oss-security@...ts.openwall.com
Subject: Re: nvi crash recovery
* Hanno Böck <hanno@...eck.de>, 2017-11-03, 21:26:
>nvi saves recovery files to /var/tmp/vi.recover and creates them with
>600 permissions.
>So all the problems discussed don't really apply here.
>However the dir itself gets created by the first user using nvi.
Sounds like a recipe for disaster.
In Debian, installation scripts try to ensure that /var/tmp/vi.recover
is root-owned:
if [[ -L /var/tmp/vi.recover || \
-e /var/tmp/vi.recover && ! -d /var/tmp/vi.recover ]]; then
echo "Cannot create recovery directory /var/tmp/vi.recover" 1>&2
exit 1
fi
[ -d /var/tmp/vi.recover ] || mkdir -p /var/tmp/vi.recover
chown root:root /var/tmp/vi.recover
chmod 1777 /var/tmp/vi.recover
This is racy and can be exploited to chmod arbitrary files:
https://bugs.debian.org/771375
--
Jakub Wilk
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