CVE-2017-20002

Name	CVE-2017-20002
Description	The Debian shadow package before 1:4.5-1 for Shadow incorrectly lists pts/0 and pts/1 as physical terminals in /etc/securetty. This allows local users to login as password-less users even if they are connected by non-physical means such as SSH (hence bypassing PAM's nullok_secure configuration). This notably affects environments such as virtual machines automatically generated with a default blank root password, allowing all local users to escalate privileges.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-2596-1
Debian Bugs	914957

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
shadow (PTS)	bullseye	1:4.8.1-1	fixed
	bookworm	1:4.13+dfsg1-1	fixed
	sid, trixie	1:4.16.0-7	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Urgency	Origin	Debian Bugs
shadow	source	stretch	1:4.4-4.1+deb9u1		DLA-2596-1
shadow	source	(unstable)	1:4.5-1			914957

Introduced in attempt to address #830255 in 1:4.4-2