Vulnerability CVE-2017-20002


Published: 2021-03-17

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.

Type:

CWE-269

(Improper Privilege Management)

CVSS2 => (AV:L/AC:L/Au:N/C:P/I:P/A:P)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.6/10
6.4/10
3.9/10
Exploit range
Attack complexity
Authentication
Local
Low
No required
Confidentiality impact
Integrity impact
Availability impact
Partial
Partial
Partial
Affected software
Debian -> Shadow 
Debian -> Debian linux 

 References:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=877374
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=914957
https://lists.debian.org/debian-lts-announce/2021/03/msg00020.html

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