CVE-2017-20002: 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…

PriorityP339high7.8CVSS 3.1

AVLACLPRLUINSUCHIHAH

EPSS

0.40%

32.8th percentile

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.

Affected

7 ranges

Vendor	Product	Version range	Fixed in
debian	debian_linux	—	—
debian	shadow	< shadow 1:4.5-1 (bookworm)	shadow 1:4.5-1 (bookworm)
debian	shadow	—	—
shadow_project	shadow	>= 0 < 1:4.5-1	1:4.5-1
shadow_project	shadow	>= 0 < 1:4.5-1	1:4.5-1
shadow_project	shadow	>= 0 < 1:4.5-1	1:4.5-1
shadow_project	shadow	>= 0 < 1:4.5-1	1:4.5-1

CVSS provenance

nvdv3.17.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvdv2.04.6MEDIUMAV:L/AC:L/Au:N/C:P/I:P/A:P

osv7.8HIGH

vendor_debian7.8HIGH

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