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 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.

• CWE-269

• https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=877374Mailing List, Vendor Advisory
• https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=914957Exploit, Mailing List, Vendor Advisory
• https://lists.debian.org/debian-lts-announce/2021/03/msg00020.htmlMailing List, Vendor Advisory
• https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=877374Mailing List, Vendor Advisory
• https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=914957Exploit, Mailing List, Vendor Advisory
• https://lists.debian.org/debian-lts-announce/2021/03/msg00020.htmlMailing List, Vendor Advisory

Published

Mar 17, 2021

Last Modified

Jun 17, 2026

Status

Modified

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