CVE catalog

CVE-2017-20002

shadow: CVE-2017-20002

Severity: Medium
Published: Mar 17, 2021, 6:15:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.40% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	shadow	sid	`1:4.20.3-1`	fixed
Debian	shadow	forky	`1:4.20.3-1`	fixed
Debian	shadow	trixie	`1:4.17.4-2`	fixed
Debian	shadow	bookworm	`1:4.13+dfsg1-1+deb12u2`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	shadow	source	sid	`1:4.5-1`	not yet assigned	Not reported	[914957]
Debian	shadow	source	forky	`1:4.5-1`	not yet assigned	Not reported	[914957]
Debian	shadow	source	trixie	`1:4.5-1`	not yet assigned	Not reported	[914957]
Debian	shadow	source	bookworm	`1:4.5-1`	not yet assigned	Not reported	[914957]

[Debian bug #914957]

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[libsubid4]Fixed
Source package: [shadow]
Details (2)
- 1:4.13+dfsg1-1+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 1:4.5-1
  dsa · shadow · debian · bookworm; dsa · shadow · debian · 12
- 1:4.13+dfsg1-1+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 1:4.5-1
  dsa · shadow · debian · bookworm; dsa · shadow · debian · 12
[libsubid-dev]Fixed
Source package: [shadow]
Details (2)
- 1:4.13+dfsg1-1+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 1:4.5-1
  dsa · shadow · debian · bookworm; dsa · shadow · debian · 12
- 1:4.13+dfsg1-1+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 1:4.5-1
  dsa · shadow · debian · bookworm; dsa · shadow · debian · 12
[login]Fixed
Source package: [shadow]
Details (2)
- 1:4.13+dfsg1-1+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 1:4.5-1
  dsa · shadow · debian · bookworm; dsa · shadow · debian · 12
- 1:4.13+dfsg1-1+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 1:4.5-1
  dsa · shadow · debian · bookworm; dsa · shadow · debian · 12
[passwd]Fixed
Source package: [shadow]
Details (2)
- 1:4.13+dfsg1-1+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 1:4.5-1
  dsa · shadow · debian · bookworm; dsa · shadow · debian · 12
- 1:4.13+dfsg1-1+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 1:4.5-1
  dsa · shadow · debian · bookworm; dsa · shadow · debian · 12
[uidmap]Fixed
Source package: [shadow]
Details (2)
- 1:4.13+dfsg1-1+deb12u2 · amd64 · bookworm
  Fixed · Fixed: 1:4.5-1
  dsa · shadow · debian · bookworm; dsa · shadow · debian · 12
- 1:4.13+dfsg1-1+deb12u2 · arm64 · bookworm
  Fixed · Fixed: 1:4.5-1
  dsa · shadow · debian · bookworm; dsa · shadow · debian · 12

[Debian 13 (Trixie)]

[libsubid5]Fixed
Source package: [shadow]
Details (2)
- 1:4.17.4-2 · amd64 · trixie
  Fixed · Fixed: 1:4.5-1
  dsa · shadow · debian · 13
- 1:4.17.4-2 · arm64 · trixie
  Fixed · Fixed: 1:4.5-1
  dsa · shadow · debian · 13
[libsubid-dev]Fixed
Source package: [shadow]
Details (2)
- 1:4.17.4-2 · amd64 · trixie
  Fixed · Fixed: 1:4.5-1
  dsa · shadow · debian · 13
- 1:4.17.4-2 · arm64 · trixie
  Fixed · Fixed: 1:4.5-1
  dsa · shadow · debian · 13
[login.defs]Fixed
Source package: [shadow]
Details (2)
- 1:4.17.4-2 · all · trixie
  Fixed · Fixed: 1:4.5-1
  dsa · shadow · debian · 13
- 1:4.17.4-2 · all · trixie
  Fixed · Fixed: 1:4.5-1
  dsa · shadow · debian · 13
[passwd]Fixed
Source package: [shadow]
Details (2)
- 1:4.17.4-2 · amd64 · trixie
  Fixed · Fixed: 1:4.5-1
  dsa · shadow · debian · 13
- 1:4.17.4-2 · arm64 · trixie
  Fixed · Fixed: 1:4.5-1
  dsa · shadow · debian · 13
[uidmap]Fixed
Source package: [shadow]
Details (2)
- 1:4.17.4-2 · amd64 · trixie
  Fixed · Fixed: 1:4.5-1
  dsa · shadow · debian · 13
- 1:4.17.4-2 · arm64 · trixie
  Fixed · Fixed: 1:4.5-1
  dsa · shadow · debian · 13

Observed: Oct 23, 2026, 5:28:49 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database]